June 23 to June 29: This Week in Denver Weather History
Late spring and early summer continue Colorado’s severe weather season. Looking back at this week in Denver weather history we see we experience a wide variety of conditions from record-setting heat to damaging thunderstorms with hail, wind and flooding.
From the National Weather Service:
23
In 1874…a thunderstorm pelted the city with hail and brief heavy rain. Rainfall was 0.30 inch in 10 minutes. Total rainfall was 0.36 inch for the day. Hail to 1/4 inch in diameter destroyed the strawberry fields near the limits of the city. The thunderstorm dropped the temperature from 93 degrees to 80 degrees in 5 minutes.
In 1887…north winds were sustained to 42 mph.
In 1954…the temperature climbed to a high of 102 degrees… Setting a record for the date.
In 1962…lightning struck and injured a man near Buffalo… southwest of Denver…while he was riding in the back of a pick-up truck. He suffered multiple bruises…cuts…and shock.
In 1965…an apparent tornado was reported 18 miles east of Denver. No damage was reported.
In 1975…hail up to 3/4 inch in diameter fell at Stapleton International Airport and over other parts of metro Denver. Four funnel clouds were sighted: 10 miles northeast of Denver…south of Boulder…southeast of Boulder…and south of Aurora.
In 1976…heavy rain and eroding water collapsed a retaining wall in Thornton.
In 1981…a thunderstorm produced wind gusts to 60 mph in Littleton.
In 1982…two separate bolts of lightning injured three men in southwest Denver. Two buildings were slightly damaged.
In 1987…severe thunderstorms produced large hail across metro Denver. Golf ball size hail fell in Littleton…near Morrison…and in southeast Aurora with 1 1/2 inch hail recorded in south Lakewood and 1 inch hail reported in Littleton…Arvada…and at Cherry Creek dam. Two funnel clouds were sighted 20 miles southwest of Stapleton International Airport.
In 1993…non-convective high winds developed along the Front Range foothills. Wind gusts to 70 mph were common near the foothills with numerous tree limbs broken by the winds. North winds gusting to 36 mph were recorded at Stapleton International Airport.
In 1999…hail as large as 1 inch in diameter was measured in the city of Denver with 3/4 inch hail in Littleton.
In 2001…a severe thunderstorm produced large hail in south metro Denver. Hail as large as 1 1/2 inch in diameter fell in Littleton with 1 1/4 inch hail near Sheridan.
In 2009…hail up to 1 inch in diameter was observed near Parker. At Denver International Airport…a total of 1.64 inches was measured in a 24-hr period…setting a new record for the date.
June 16 to June 22: This Week in Denver Weather History
Late spring and early summer weather hazards abound in Colorado. Looking back at this week in Denver weather history we see many examples including wildfires, deadly lightning, damaging lightning and dangerous flooding.
From the National Weather Service:
12-17
In 2000…two large wildfires developed in the Front Range foothills as careless campers and very dry conditions proved to be a dangerous combination. Strong winds gusting in excess of 60 mph on the 13th fanned the flames… Spreading both wildfires out of control. Winds gusted to 78 mph atop Niwot Ridge near the Continental Divide west of Boulder. The Hi Meadows wildfire…about 35 miles southwest of Denver…consumed nearly 11 thousand acres and 80 structures…mostly high priced homes. The Bobcat wildfire…located about 12 miles southwest of Fort Collins… consumed nearly 11 thousand acres and 22 structures. Late on the 16th…a strong cold front moved south over the great plains into northeastern Colorado. Low level upslope conditions developed in the wake of the front…producing 2 to 4 inches of snowfall overnight at elevations above 8 thousand feet. Firefighters were able to contain both fires shortly thereafter.
15-16
In 1963…heavy rain and hail ravaged metro Denver. In southeast Denver…heavy rain flooded homes and streets. Hail to a depth of 4 inches on the ground stripped trees and plants and drifted to depths of 3 to 4 feet in some areas. Flood waters on the valley highway were 19 feet deep in places…trapping many cars. Many creeks were running over their banks. On the 15th…the main thunderstorm cell passed over south Denver…dumping as much as 4 inches of rain in 90 minutes. Precipitation at Stapleton Airport totaled 0.91 inch on the 15th and 1.31 inches on the 16th. A funnel cloud was sighted briefly 4 miles to the south-southeast of Stapleton Airport on the 15th. Damage from hail and flooding amounted to near a million dollars.
16
In 1950…very heavy rain and hail storms in southwest Denver caused an estimated 750 thousand dollars in hail and flood damage. Thunderstorms produced 2.06 inches of rain at Stapleton Airport with 2.23 inches of rain measured in downtown Denver.
In 1965…a tornado…15 miles south-southeast of Denver… Touched down and damaged two houses in northern Douglas County. Three golfers at a country club and a women who lived north of Castle Rock were injured by falling structures.
In 1983…a microburst wind gust to 54 mph was recorded at Stapleton International Airport.
In 1984…a tornado touched down briefly in Parker. No damage was reported.
In 1986…lightning injured 5 people just north of the Denver city limits in Adams County. The victims were members of a drum and bugle corps and were standing near a metal scaffold. Heavy rain from the storm also caused street flooding in the metro area.
In 1991…hail to golf ball size fell at Conifer.
In 1992…a rare mid-June high wind event wreaked havoc over metro Denver when a pacific cold front moved across the Rocky Mountains. Strong winds at speeds of 40 to 50 mph were common along the Front Range foothills. Winds reaching 107 mph in the foothills west of Denver and 79 mph at Longmont…caused damage ranging from trees being toppled to large trucks being rolled over. Strong winds estimated at 75 mph rolled a 35-foot truck carrying building supplies on U.S. Highway 36 north of Boulder. The truck driver and a passenger as well as the driver of another car were slightly injured. The winds downed power lines. The gambling towns of central city and Blackhawk were without power for a couple of hours. West winds reached 43 mph at Stapleton International Airport.
In 1996…a small tornado touched down in the foothills southwest of Boulder near Pinecliffe…knocking down 50 to 100 large pine trees. A house nearby sustained damage when shingles were ripped from the roof. The tornado also picked up a 17-foot sailboat with attached trailer and carried it 25 feet into a nearby tree. In addition… Thunderstorm wind gusts to 46 mph were measured at Denver International Airport.
In 2004…hail as large as 1 inch in diameter fell near Castle Rock. Hail to 3/4 inch was measured near Bennett.
In 2005…severe thunderstorms produced hail as large as 1 inch in diameter in Centennial.
In 2011…severe thunderstorms produced and damaging across parts of metropolitan Denver. In Lakewood…a tree blew down and landed on at least five cars. At Centennial Airport…a section of a roof on a hangar was ripped off the strong winds. A peak wind gust of 46 mph was recorded at Centennial Airport and Denver International Airport in the evening.
June 9 to June 15: This Week in Denver Weather History
June means severe weather in Colorado and our look back at this week showcases that fact. Numerous, historical events have occurred during this week in the past including the disastrous Hayman fire and the infamous 1988 Denver tornadoes.
From the National Weather Service:
7-9
In 1979…rain…at times with thunder on the 7th…fell almost continuously through the morning of the 9th. Rainfall totaled 2.28 inches at Stapleton International Airport over the 3 days. High temperature of only 49 degrees on the 8th was a record low maximum for the date.
9
In 1900…an apparent cold front produced north winds to 42 mph with gusts to 47 mph.
In 1923…heavy rainfall totaled 2.18 inches in downtown Denver…where northwest winds were sustained to 27 mph. Heavy rain also fell in Boulder…causing flooding on Boulder and south Boulder creeks.
In 1939…post-frontal sustained northwest winds to 35 mph produced some blowing dust…which reduced the visibility to one mile at times during the afternoon. Dusty conditions prevailed into the early evening. The airport station reported a maximum wind of 56 mph. A few minor injuries and some damage resulted. A few trees were uprooted…some fruit was blown from trees…and a section of power lines was blown down.
In 1959…dry thunderstorm winds…estimated to near 70 mph… Toppled a 40-foot-high poplar tree…which was 4 to 5 inches in diameter…near Cherry Creek dam. The Colorado state patrol reported a possible tornado 1 mile south of the dam.
In 1960…strong gusty winds tore the roofs from 2 patios in Aurora. One of the roofs was blown over a house and landed on a car damaging its top. A house trailer was also overturned. Other minor damage was reported to roofs… Windows…and trees in Aurora. A thunderstorm wind gust to 43 mph was recorded at Stapleton Airport.
In 1963…golf ball size hail fell at Cheery Creek Reservoir.
In 1967…a small tornado damaged trees and a dwelling in south Denver. The storm touched down at the intersection of 1st Avenue and Harrison Street and moved northeast to the intersection of 3rd Avenue and Albion Street. Damage included 3 small roofs removed…15-20 large trees uprooted…one car overturned and thrown against a house… Plus other minor damage. A funnel cloud reported at the same time 10 miles north of Denver possibly touched ground. Later…funnel clouds were reported 12 miles south-southeast of Stapleton International Airport…10 miles southwest…and 5 miles north. A tornado was sighted 3 1/2 miles east of Stapleton International Airport by weather bureau personnel for a duration of 5 minutes. Heavy rain and some hail fell over much of the area.
In 1974…the start of the shortest seasonal snow free period on record…94 days…occurred with the last snow of the season…a trace…on the 8th. The first snow of the next season occurred on September 11th when a trace of snow fell at Stapleton International Airport. A funnel cloud was observed just east of Aurora and a small funnel was sighted just northeast of Stapleton International Airport.
In 1985…a thunderstorm wind gust to 62 mph was reported at Golden Gate Canyon in the foothills west of Denver.
In 1986…a thunderstorm…which dumped heavy rain and caused some street flooding across north metro Denver…produced a small tornado 5 miles east of Brighton. No damage was reported.
In 1987…strong thunderstorm wind gusts in Conifer destroyed a porch on a house; the wind gust apparently picked up the porch and dropped it on a man…killing him. The wind also damaged the roof of the house and a nearby barn. The same thunderstorm spawned a tornado…which touched down briefly just south of Lakewood. No damage was reported. Up to 3 inches of rain fell in a short time 8 miles southwest of Littleton. A few businesses in Englewood suffered minor water damage. A tornado was sighted between Watkins and Bennett. It was on the ground for 15 minutes. A weak tornado also touched down 4 miles southwest of Castle Rock. The twister tossed an aluminum shed into the air and carried it about 100 feet. A funnel cloud was sighted 15 miles east-northeast of Stapleton International Airport.
In 1988…golf ball size hail fell in Conifer along with 1.30 inches of rain. Three miles north of Louisville…1.10 inches of rain fell in 20 minutes. Ping pong ball size hail was measured in Arvada.
In 1990…3/4 inch hail fell in Castle Rock.
In 1991…hail two inches in diameter fell near Evergreen. Hail to 1 inch diameter fell in Lakewood where a funnel cloud was also sighted. One inch diameter hail was also reported in Aurora.
In 2002…high temperatures…low relative humidities…and strong gusty winds allowed the Hayman wildfire…located in the foothills to the southwest of Denver…to become the largest wildfire in the state’s history. Although the fire was initially started by a U.S. Forest Service employee…the ongoing drought and dry conditions allowed the fire to spread rapidly out of control. The wildfire consumed nearly 138 thousand acres of forest land and 133 homes before it could be contained and finally extinguished on June 30th. About 1800 households had to be evacuated during the blaze. Southwest winds aloft swept the smoke plume directly over metro Denver…creating poor air quality and blocking the sun. Much of metro Denver choked on smoke with the southern suburbs receiving the most. Smoke and ash restricted surface visibilities to a mile or less at times in the Denver and Castle Rock areas and to 2 miles at Denver International Airport.
In 2003…thunderstorm winds gusted to 51 mph at Denver International Airport. The storm produced only a trace of rain.
In 2004…severe thunderstorms produced large hail across portions of metro Denver for the second day in a row. The most extensive damage occurred across southern sections of metro Denver in Aurora…Lakewood…Littleton…and south Denver. The combined damage to homes and vehicles…not including commercial buildings…was estimated at 146.5 million dollars…making the event the 4th costliest insurance disaster in the state’s history. Hail as large as 2 1/4 inches in diameter fell near southern Aurora with hail to 1 3/4 inches in the city of Denver and in Lakewood. Hail to 1 1/2 inches fell near Morrison with 1 inch hail measured in Thornton…near Buckley Air Force Base…and near Roggen. Hail to 3/4 inch diameter fell in Littleton and near Conifer. A small tornado touched down near Bennett…but did no damage.
9-10
In 1864…high water from melting snow combined with heavy rains over the upper reaches of the South Platte River forced the river over its banks and caused flooding of low lying areas along the river in the city. The amount of rainfall in the mountains and in the city is unknown.
June 2 to June 8: This Week in Denver Weather History
June is when Colorado sees the majority of its severe weather and our look back at this week in Denver weather history highlights this fact. Many occurrences of damaging and deadly lightning, powerful winds, large hail and of course tornadoes are seen.
From the National Weather Service:
1-2
In 2002…unusually very warm weather for so early in June resulted in two temperature records. Maximum temperatures of 96 degrees on the 1st and 93 degrees on the 2nd were record highs for each date…respectively.
1-4
In 1977…unusually warm weather for this early in June resulted in 3 maximum temperature records being equaled at the time: 88 degrees on the 1st…90 degrees on the 2nd… And 93 degrees on the 4th. Maximum of 91 degrees on the 3rd was not a record.
2
In 1914…flooding occurred on Boulder creek when heavy rains added to heavy snowmelt runoff. Flooding damaged the water supply system from the mountains into Boulder and destroyed roads and bridges in the canyons above Boulder. The flooding in central Boulder was described as the worst since the tragic flood of May 29th through June 3rd in 1894. However…there was no reported loss of life. The flood waters also inundated pasture land to the east of the town.
In 1951…the lowest recorded temperature in June…30 degrees… Occurred. The unusually cold weather was accompanied by 0.3 inch of snowfall. Precipitation…both rain and melted snow…totaled 0.30 inch.
In 1966…microburst winds gusted to 51 mph at Stapleton International Airport.
In 1981…a severe thunderstorm roared through metro Denver… Dumping 2.00 inches of rain in as little as 20 minutes and bombing many areas with hail to 1 3/4 inches in diameter. The heavy rain caused local flooding with up to 3 feet of water in some streets in northwest metro Denver. Part of a street was washed out in Thornton. Lightning strikes started a fire and caused a power outage just north of Denver. Lightning also struck a barn which burned to the ground in Brighton. Numerous cars sustained minor hail damage. A tornado was spotted 4 miles northeast of the rocky mountain arsenal…but caused no damage.
In 1982…severe thunderstorms produced large hail across metro Denver. Hail to 3/4 inch in diameter was reported in Louisville and northeast Denver. Golf ball size hail fell near Strasburg where two tornadoes were also sighted.
In 1983…a tornado touched down 5 miles south of Bennett. It destroyed an outbuilding and did extensive damage to greyhound dog shelters. Golf ball size hail fell near the tornado…destroying some hay.
In 1985…3/4 inch hail fell in southwest metro Denver.
In 1989…large hail fell over eastern and central Denver. A few stones were as large as baseballs…and many ranged from 3/4 inch to golf ball size. The hail piled up 2 to 4 inches deep in some areas. Hail to 3/4 inch fell at Buckley Field in Aurora…and 7/8 inch hail fell just east of Aurora. A home in Louisville was struck by lightning and was 30 percent destroyed by the ensuing fire.
In 1991…strong thunderstorm winds in Arapahoe County…14 miles southeast of Stapleton International Airport…damaged the roof of a home and a radio antenna. A funnel cloud… 4 miles northeast of Stapleton International Airport…was sighted for 11 minutes by national weather service observers.
In 1993…a tornado touched down briefly in south Denver… Destroying the 4-inch thick concrete roof of a building and causing about 20 thousand dollars in damage. The twister also picked up a trash dumpster and dropped it onto a car 30 feet away…causing an estimated 3 thousand dollars in damage. Hail up to an inch in diameter fell in Aurora… Conifer…and Bennett. Two funnel clouds were spotted near Deckers. A funnel cloud was sighted for 19 minutes by National Weather Service observers to the southwest of Stapleton International Airport.
In 1994…lightning struck two homes in Denver…starting fires which caused considerable damage to both. Hail to 3/4 inch in diameter fell in Golden.
In 1995…lightning struck a house in Nederland…causing a fire that was doused by subsequent rainfall. A portion of the roof and wall was damaged. The storm also left most of Nederland without power for two hours. Lightning also struck a high chimney of an elementary school in west Denver. The jolt sprayed bricks around the school yard and parking lot. Twenty students and teachers were in the school building at the time…but all escaped without injury. A funnel cloud was sighted over Fort Lupton…and 3/4 inch hail fell in Lafayette.
In 2003…severe thunderstorms produced strong winds and large hail. Hail as large as 1 1/2 inches in diameter fell near Parker. Estimated wind gusts to 70 mph occurred near Parker and near Denver International Airport where thunderstorm wind gusts to 52 mph were recorded. Wind gusts to 60 mph were estimated near Bennett.
In 2005…a severe thunderstorm produced hail as large as 1 inch in diameter in the city of Denver. A tornado was sighted near Bennett along with 3/4 inch hail.
In 2008…severe thunderstorms produced large hail over western Arapahoe…northern Denver and southern weld counties. Hail…2 inches in diameter…was observed near Brighton; with hail to 1 1/2 inches in diameter…5 miles east of prospect. Hail to one inch in diameter was observed near Buckley Field…Frederick and Denver.
2-4
In 1989…heavy rain drenched metro Denver with the greatest amounts recorded on the 3rd. Total rainfall ranged from 1 1/2 to 3 inches. Roads were washed out in Boulder County… And flooded basements caused water damage to houses in the Gunbarrel section of Boulder. In suburban Denver…heavy rain caused minor flooding along Lena Gulch in Jefferson County where two mobile home parks were evacuated. Rainfall totaled 1.66 inches at Stapleton International Airport.
May 26 to June 1: This Week in Denver Weather History
Our look back at this week in Denver includes a stunning array of extraordinary weather. Typical springtime severe weather with hail, damaging wind, tornadoes and deadly lightning are very prevalent. Snow has even made an appearance on more than one occasion.
From the National Weather Service:
20-27
In 2002…lightning sparked a wildfire near Deckers. Extremely dry conditions and very strong winds the following day allowed the fire…known as the Schoonover…to consume 3850 acres before it could be contained. Thirteen structures were destroyed…including 4 homes…resulting in 2.2 million dollars in damage.
24-26
In 1996…a late spring snowstorm dumped 4 to 10 inches of snow over the Front Range foothills. Conifer picked up 10 inches of new snow; Aspen Springs…9 inches; and Central City…8 inches. The sticky…heavy snow clung to power lines and pulled tree branches down…causing power outages to about 1200 homes in the Conifer area. It took up to 6 hours to restore power to some residences. Lightning struck a telephone data cabinet in Conifer on the 25th…which knocked out phone service to about 1500 customers. Widespread rain fell across metro Denver… Where rainfall totaled 2.07 inches at the site of the former Stapleton International Airport and 1.66 inches at Denver International Airport where north winds gusted to 24 mph on the 26th.
In 2010…high winds preceding a cold front…swept across the Front Range foothills and urban corridor. In Aurora… The wind damaged the roof of Rangeview High School. In Conifer and Denver…the wind downed trees and power lines and caused several brief outages. The downed power lines also caused several cars to catch fire in the vicinity of 1590 Cook St. in Denver. Peak wind gusts included: 82 mph at Highlands Ranch…67 mph…4 miles east of Franktown and Longmont; 65 mph in Boulder…64 mph in Centennial and Denver International Airport…62 mph near Parker and 60 mph in Arvada.
25-26
In 1950…a major storm dumped 10.0 inches of snowfall downtown and 10.7 inches at Stapleton Airport where northwest winds gusted to 30 mph on the 25th. The storm caused extensive damage to utility wires and trees which were in full leaf. A daily record minimum temperature of 31 degrees occurred on the 25th. This was the coldest temperature on this date in 79 years and for so late in the season.
In 1989…a late season snow storm dropped snow as low as 6 thousand feet along the Front Range. Most places in the foothills had 2 to 5 inches of snow. Overnight rainfall totaled 0.33 inch at Stapleton International Airport where north winds gusted to 37 mph on the 25th.
In 1994…lightning struck a television transmitter on Lookout Mountain near Golden and burned out a switcher…which disrupted cable service for 2 hours.
26
In 1897…apparent post-frontal north winds were sustained to 42 mph with gusts as high as 48 mph.
In 1942…the all-time highest recorded temperature in May…95 degrees…occurred.
In 1978…two children were struck and killed by lightning on a junior high school playground in Parker.
In 1987…1 inch diameter hail fell near Boulder and Bennett. The hail was fairly soft and caused no damage.
In 1993…dry thunderstorms produced wind gusts to 81 mph at Jefferson County Airport near Broomfield. Several trees were blown down by the strong winds. Microburst winds gusted to 51 mph at Stapleton International Airport.
In 1995…a woman was injured in Littleton when the car she had just entered was struck by lightning. All of the windows in the car were blown out by the strike. A funnel cloud was sighted near Littleton.
In 2000…a strong microburst wind gust to 92 mph flipped a small airplane on its back and blew a dc-3 loose from its moorings…which allowed it to roll onto a grassy field at Front Range airport near Watkins.
In 2010…severe thunderstorms pounded parts of the urban corridor with very large hail…heavy rain…damaging winds and a tornado. The hail…ranging in size from 1 inch to 2 3/4 inches in diameter…struck Brighton…Commerce City and northeast Denver the hardest. The storms continued to spread destruction to the north and east…impacting byers…Hudson…Deer Trail and Prospect Valley. The combination of hail and wind stripped the bark and branches from trees. Numerous accidents were reported as the hail accumulated up to a foot deep. Snowplows were called out to clear the roadways. Flash flooding occurred along State Highway 52 between Hudson and Keenesburg…and forcing the closure of the highway. Widespread crop damage was also reported as the area was inundated with up to 18 inches of water. Extensive damage to homes…businesses and automobiles was reported with the damage estimated to be around 70 million dollars. A tornado touched down near Denver International Airport…but did no damage. Lightning struck a child in Commerce City while she was watching television. She suffered minor injuries to her leg. At the Rocky Mountain Arsenal Wildlife Refuge…a lightning strike killed a bison. At Denver International Airport…only 0.01 inch of rainfall was observed…along with a peak wind gust to 48 mph from the southeast.
The National Oceanic and Atmospheric Administration (NOAA) released its climate summary for June 2012 showing the United States experienced an unusually warm month. Most notably the U.S. has recorded its warmest first half of the year on record and the warmest 12 month period on record. Climate change? Learn more about the warm weather across the nation on Examiner.com.
June 2012 will go into the record books as the hottest June since record-keeping began in Denver in 1872.
You didn’t need a thermometer to know that June 2012 was extraordinarily hot. What is normally one of the most pleasant months in Thornton turned into a scorcher with high temperature records seemingly falling daily.
The first half of the month was unseasonably warm but that was only a warm-up (pun intended) for what would come during the latter half of the month.
Officially for Denver nine daily high temperature records were tied or broken. The first record fell on June 4th and then the records on the 9th, 17th, 18th, 22nd, 23rd, 24th, 25th and 26th followed suit.
The temperature at Denver International Airport hit 100 degrees or higher six times during the month – the most ever recorded in June. Five of those 100 degree days were consecutive from the 22nd to the 26th and all of those dates set records. On 17 of the 30 days of the month the temperature reached 90 degrees or higher.
In the end Denver saw an average monthly temperature of 75.0 degrees. This was an astonishing 7.6 degrees above normal and puts June 2012 in the books as the hottest on record.
Thornton, while not quite as warm as DIA, still saw an extraordinarily hot month. We recorded 16 days of 90 degree or higher temperatures, one shy of Denver.
From the time ThorntonWeather.com was founded in October 2006 until the start of June 2012, we had only twice before recorded temperatures of 100 degrees or higher. We doubled that tally in June alone as on four days we reached 100 degrees or higher.
A look at temperature records set in Denver during the month of June. Click for a larger image. (National Weather Service)
Thornton recorded an average monthly temperature of 73.9 degrees. This was 6.7 degrees above the average of the previous five Junes.
In terms of precipitation, Denver officially recorded 1.22 inches of precipitation which was 0.76 inches below normal. All of that was recorded on the 6th and 7th when thunderstorms rolled through the airport area.
Here in Thornton we didn’t benefit from the thunderstorms nearly as well. A mere 0.11 inch of precipitation fell into our rain bucket, far below the 1.44 average of the past six years.
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
649 AM MDT SUN JUL 1 2012
…JUNE 2012…HOTTEST JUNE ON RECORD…
June 2012 was the hottest June in Denver since weather records began back in 1872. The month got off to a warm start with above normal temperatures during the first 9 days of the month. Record maximum temperatures were set and tied on the 4th and 9th respectively. An upper level trough of low pressure which moved across the northern and central Rockies brought cooler temperatures to the region… Resulting in below normal temperatures on the 10th and 11th. Upper level high pressure then reestablished over the region bringing another stretch of above normal temperatures from the 12th through the 19th. Record high temperatures were set both on the 17th and 18th. An upper level trough of low pressure and associated cold front brought some relief to Colorado on the 20th. The high temperature on the 20th was a pleasant 76 degrees…which was eight degrees below normal. Much above normal temperatures returned to Denver the final 10 days of the month as a strong upper ridge of high pressure built over the desert southwest and migrated into the central plains states. A stretch of 5 consecutive 100 degree days occurred from the 22nd through the 26th. This was only the third time in Denver weather history in which this has happened. The other occurrences were July 4th-8th 1989 and July 19th-23rd 2005. In addition…each of the 5 days set new record high temperatures. The 105 degree readings on the 25th and 26th established a new all time record maximum temperature for the month of June and tied Denver’s all time annual record high temperature.
Temperatures:
The average temperature for the month was 75.0 degrees which was 7.6 degrees above normal. This makes June of 2012 the hottest June on record. There were 17 days in which the maximum temperature exceeded 90 degrees. This ties 2002 for the second most 90 degree days in June. June of 2006 still holds the record with nineteen 90 degree days. There were also six days in which the temperature reached the century mark. This is a new record for 100 degree days in the month of June. The old record was 3 days back in June of 1990. The coldest temperature on the month was 43 degrees which occurred on the morning of the 11th. Below is list of temperature records tied or broken during the month.
JUNE 2012 TEMPERATURE RECORDS:
MONTHLY RECORDS:
JUNE 2012 WAS HOTTEST ON RECORD (AVERAGE TEMPERATURE WAS 75.0 DEGREES)
PREVIOUS RECORD WAS JUNE 1994 (AVERAGE TEMPERATURE OF 73.5 DEGREES)
JUNE 22ND-26TH 5 CONSECUTIVE DAYS MAX TEMPERATURE REACHED 100 DEGREES
OTHER OCCURRENCES (JULY 4TH-8TH 1989) (JULY 19TH-23RD 2005)
JUNE 25TH AND 26TH SET ALL TIME JUNE RECORD HIGH TEMPERATURE 105 DEGREES
(PREVIOUS RECORD 104 DEGREES IN 1994)
DAILY RECORDS:
DATE TEMPERATURE TYPE OF RECORD OLD RECORD YEAR(S) SET
JUNE 4TH 94 DEGREES NEW RECORD MAX 93 DEGREES 1946, 1977
1990, 2010
JUNE 9TH 95 DEGREES TIED RECORD MAX 95 DEGREES 1922, 2002
JUNE 17TH 98 DEGREES NEW RECORD MAX 97 DEGREES 2007
JUNE 18TH 100 DEGREES NEW RECORD MAX 99 DEGREES 1936, 1990
JUNE 22ND 102 DEGREES NEW RECORD MAX 98 DEGREES 1874
JUNE 23RD 104 DEGREES NEW RECORD MAX 102 DEGREES 1954
JUNE 24TH 102 DEGREES NEW RECORD MAX 100 DEGREES 2007
JUNE 25TH 105 DEGREES NEW RECORD MAX 100 DEGREES 1991
JUNE 26TH 105 DEGREES NEW RECORD MAX 104 DEGREES 1994
JUNE 26TH 71 DEGREES NEW RECORD HI MIN 68 DEGREES 1936 PREVIOUS YEARS
PRECIPITATION.
PRECIPITATION FOR THE MONTH WAS 1.22 INCHES...WHICH IS 0.76 INCHES
BELOW THE NORMAL 0F 1.98 INCHES. ALL OF THIS PRECIPITATION FELL ON
THE 6TH AND 7TH WHEN STRONG TO SEVERE THUNDERSTORMS MOVED ACROSS
PORTIONS OF THE DENVER METRO AREA. THERE WERE 8 THUNDERSTORMS
OBSERVED AT DENVER INTERNATIONAL AIRPORT DURING THE MONTH. THERE
WERE NO DAYS WITH DENSE FOG WITH A VISIBILITY AT OR BELOW 1/4 MILE
DURING THE MONTH. THE PEAK WIND OF 67 MPH FROM A WESTERLY DIRECTION
OCCURRED ON THE 26TH.
...................................
...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF JUNE 2012...
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2012
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
................................................................
TEMPERATURE (F)
RECORD
HIGH 105 06/26/2012
06/25/2012
LOW 30 06/02/1951
HIGHEST 105R 06/26 104 1 96 06/29
06/25 06/28
LOWEST 43 06/11 30 13 45 06/10
AVG. MAXIMUM 91.7 82.4 9.3 83.3
AVG. MINIMUM 58.4 52.3 6.1 53.0
MEAN 75.0 67.4 7.6 68.2
DAYS MAX >= 90 17 7.9 9.1 7
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.96 1882
MINIMUM T 1890
TOTALS 1.22 1.98 -0.76 2.43
DAILY AVG. 0.04 0.07 -0.03 0.08
DAYS >= .01 2 8.4 -6.4 8
DAYS >= .10 2 4.6 -2.6 4
DAYS >= .50 2 1.4 0.6 2
DAYS >= 1.00 0 0.3 -0.3 1
GREATEST
24 HR. TOTAL 0.69 06/06 TO 06/07 06/19 TO 06/20
06/30 TO 06/30
06/30 TO 06/30
SNOWFALL (INCHES)
RECORDS
TOTAL 0.4 1919
TOTALS 0.0
DEGREE_DAYS
HEATING TOTAL 6 62 -56 26
SINCE 7/1 5399 6058 -659 5707
COOLING TOTAL 314 133 181 126
SINCE 1/1 365 155 210 135
FREEZE DATES
RECORD
EARLIEST 09/08/1962
LATEST 06/08/2007
EARLIEST 10/07
LATEST 05/05
.................................................
WIND (MPH)
AVERAGE WIND SPEED 12.2
RESULTANT WIND SPEED/DIRECTION 5/169
HIGHEST WIND SPEED/DIRECTION 52/240 DATE 06/02
HIGHEST GUST SPEED/DIRECTION 67/250 DATE 06/02
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.50
NUMBER OF DAYS FAIR 8
NUMBER OF DAYS PC 21
NUMBER OF DAYS CLOUDY 1
AVERAGE RH (PERCENT) 33
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 8 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 2
LIGHT RAIN 5 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 1
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 1 FOG W/VIS <= 1/4 MILE 0
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
June 17 to June 23 - This Week in Denver Weather History
This year the weather in June has been most notable for its heat. That however is far less common than severe weather conditions with lightning, tornadoes and hail. All of these we see in our look back at this week in Denver weather history.
From the National Weather Service:
24
In 1873…there was a great deal of smoke from a fire in the mountains to the southwest of the city during the late afternoon.
In 1875…smoke from forest fires in the mountains to the southwest could plainly be seen from the city.
In 1958…a strong cold front produced a north wind gust to 55 mph at Stapleton Airport where blowing dust briefly reduced the visibility to 1 mile.
In 1982…one inch diameter hail pelted west Denver. A half inch of rain drenched the suburb of Englewood in 10 minutes. Hail piled up to 5 inches deep…snarling rush hour traffic and damaging some stores in a shopping center when the roof started leaking.
In 1988…lightning destroyed the chimney of a house near Evergreen. Another bolt demolished a radio transmitter in the area.
In 1989…golf ball size hail cut a swath 2 1/2 miles wide through open country 14 miles southwest of Bennett. The storm also dropped 1.75 inches of rain on the area. Hail to 3/4 inch in diameter damaged the car of a storm chaser just south of Bennett.
In 1996…a funnel cloud was sighted near Hudson where hail up to 1 3/4 inch diameter fell. Lightning struck a home in Littleton…which sparked a small fire on the roof. Thunderstorm wind gusts to 64 mph were recorded in Castle Rock.
In 2005…severe thunderstorms produced large hail across metro Denver. Hail as large as 1 inch in diameter fell near Castle Rock and Thornton. Hail to 3/4 inch was measured near Northglenn and Fort Lupton.
In 2006…severe thunderstorms raked metro Denver. Hail as large as 2 1/2 inches in diameter shattered automobile windshields in and near Boulder. Hail to 1 3/4 inches pounded areas in and near Lakewood and Morrison. Hail to 1 inch was measured in Wheat Ridge along with 7/8 inch hail in Arvada. Severe thunderstorm wind gusts estimated to 69 mph snapped power lines for a distance of one quarter mile near Castle Rock. Severe thunderstorm winds were measured to 60 mph in Sedalia. Hail as large as 1 inch in diameter fell near Evergreen and Castle Rock. Hail to 3/4 inch in diameter was reported in Louviers and near Conifer.
25
In 1873…forest fires produced a great deal of smoke in the mountains to the southwest of the city.
In 1958…an unusually cold day for summer set two temperature records for the date. Under cloudy skies with occasional drizzle…a record low maximum temperature of 55 degrees was established along with a record minimum temperature of 42 degrees.
In 1959…a waitress…working at a kitchen sink…was injured by a bolt of lightning…which struck the rear of a tavern in Denver. She was hospitalized.
In 1971…a tornado touched down briefly at a high school football field in Brighton…but caused no damage.
In 1981…3/4 inch hail pelted wheat ridge and hail to 1 1/4 inches fell in Louisville. A brief funnel cloud was sighted by national weather service personnel 4 miles east of Stapleton International Airport.
In 1982…a bolt of lightning struck a cabin in the foothills west of Denver. The resulting fire totally destroyed the cabin.
In 1987…golf ball size hail fell near Bennett.
In 1988…a tornado touched down 1 mile south of Watkins and was on the ground for 4 minutes. Another tornado was spotted just southeast of Barr Lake and was on the ground for 5 minutes. No damage was reported from either tornado. Lightning struck two rock climbers near Eldorado Springs. A 25-year-old man was killed…and a 21-year-old man suffered extensive injuries. Thunderstorm winds knocked over two elm trees near downtown Denver. One fell on a house destroying most of it. A nearby building was unroofed…and two cars were damaged. A truck that had been severely damaged by one of the Denver tornadoes 10 days before was hit again. Thunderstorm wind gusts to 51 mph were recorded at Stapleton International Airport.
In 1991…the temperature reached a high of 100 degrees… Setting a new record for the date.
In 1997…one inch diameter hail fell in Arvada and 1 1/2 inch hail in Boulder. Hail as large as 3/4 inches fell in Denver…Louisville…Westminster…and near Broomfield.
In 1999…thunderstorm winds gusted to 58 mph near Fort Lupton toppling an oil rig. A 37-year-old man was killed when he fell 55 feet from the derrick of the rig.
In 2001…four golfers and one construction worker received minor injuries from a nearby lightning strike on the Broadlands Golf Course in Broomfield.
In 2002…hail to 1 inch in diameter was measured in greenwood village.
In 2005…hail to 3/4 inch in diameter fell near Bennett and Roggen. A thunderstorm wind gust to 61 mph was recorded near Golden.
In 2009…lightning struck the Darlington prismatic electric fountain in City Park’s lake. The damage was estimated to be approximately $25000.
In 2010…wind gusts associated with a dry microburst downed several trees in the vicinity of 14th and federal…and near Bayaud St. and Clarkson St. in Denver. At Denver International Airport…a peak wind gust to 45 mph was observed from the southwest.
June 17 to June 23 - This Week in Denver Weather History
Wildfires, floods, lightning and tornadoes all make appearances in our look back at this week in Denver weather history.
From the National Weather Service:
12-17
In 2000…two large wildfires developed in the Front Range foothills as careless campers and very dry conditions proved to be a dangerous combination. Strong winds gusting in excess of 60 mph on the 13th fanned the flames… Spreading both wildfires out of control. Winds gusted to 78 mph atop Niwot Ridge near the Continental Divide west of Boulder. The hi meadows wildfire…about 35 miles southwest of Denver…consumed nearly 11 thousand acres and 80 structures…mostly high priced homes. The Bobcat wildfire…located about 12 miles southwest of Fort Collins… Consumed nearly 11 thousand acres and 22 structures. Late on the 16th…a strong cold front moved south over the great plains into northeastern Colorado. Low level upslope conditions developed in the wake of the front…producing 2 to 4 inches of snowfall overnight at elevations above 8 thousand feet. Firefighters were able to contain both fires shortly thereafter.
16-17
In 1965…on the afternoon and evening of the 16th…violent thunderstorms produced extremely heavy cloudbursts of rain over the palmer divide and sent a wall of water as high as 20 feet down both branches of plum creek into the South Platte River and through metro Denver. The heavy rainfall produced the most devastating flood in the history of Denver. Rainfall totaled 14.0 inches in 3 hours at both larkspur and palmer lake with 12.0 inches recorded in Castle Rock. The flood waters caused extensive damage to roads and bridges in larkspur…Castle Rock…and Sedalia…including washing out the I-25 bridge over East Plum Creek in Castle Rock. The citizens of metro Denver received reports of the flooding to the south and had a few hours to initiate evacuation procedures along the South Platte River…greatly limiting the loss of life. By evening…the flood reached Littleton where an heroic effort was made to save nearly 150 horses at the Centennial Racetrack…which was completely inundated by the flood waters. As the flood proceeded through the city of Denver…the river became more than 1/2 mile wide and destroyed all homes…trailer courts… And businesses in its path. The waters contained debris ranging from refrigerators to old cars. As many as 26 bridges were damaged or destroyed…including the 6th Avenue freeway bridge across the South Platte. Both public service company power plants were shut down by the flood. The King Soopers grocery chain bakery was inundated. About midnight… The torrent crested at 25 feet above normal with flow exceeding 40 times normal and is the record flood on the South Platte and many of its tributaries. The flood caused 230 million dollars in damage and 8 deaths along the entire South Platte River basin. The intense rain also caused flooding along Cherry Creek in Denver…on Toll Gate and Sand Creeks in east metro Denver…and on Kiowa and Bijou creeks to the east of Denver. The South Platte River flood closed nearly every major east-west highway into Denver…nearly isolating the city. The flood caused heavy damage to state and County roads in the area. Railroads were also hard hit with the main yards in lower downtown inundated. Sewerage… Water supply facilities…and irrigation works also received heavy flood damage. The flood crest did not reach Nebraska until the 20th.
17
In 1915…northwest winds were sustained to 41 mph with an extreme velocity to 42 mph.
In 1967…this was the 24th consecutive day with a trace or more of precipitation from May 25th. Precipitation totaled 5.87 inches during the period…more than a third of the average yearly total.
In 1975…hail more than 2 inches in diameter fell in eastern Aurora.
In 1977…golf ball size hail was reported 3 miles east of Arapahoe County airport…now centennial airport. Heavy hail to 3/4 inch in diameter was reported in Littleton… Castle Rock…and Sedalia.
In 1979…a man and a girl were struck and killed by lightning while walking in a park in northwest Denver.
In 1987…3/4 inch hail fell near Boulder.
In 1991…a microburst wind gust to 59 mph kicked up some blowing dust at Stapleton International Airport.
In 1998…hail as large as 3/4 inch in diameter fell in Boulder.
In 2003…lightning struck a feeder line…knocking out the electricity to about 3000 residents in Littleton. A lightning strike caused minor damage to the roof and attic of a home in Lafayette. Another lightning strike caused minor roof damage to a residence in Louisville. Yet another lightning strike hit a home in Denver and caused a small attic fire. Hail as large as 1 inch in diameter was measured near centennial airport and near Greenland.
In 2009…hail up to 1 inch in diameter was measured near Longmont.
June 10 to June 16 - This Week in Denver Weather History
Just as we saw in the past week, we are entering the primetime of Colorado’s severe weather season. Our look back at Denver weather history for this week shows numerous damaging, dangerous and deadly weather events.
From the National Weather Service:
9-10
In 1864…high water from melting snow combined with heavy rains over the upper reaches of the South Platte River forced the river over its banks and caused flooding of low lying areas along the river in the city. The amount of rainfall in the mountains and in the city is unknown.
10
In 1943…a man was killed by lightning while using a surveying instrument at Buckley Field.
In 1969…hail stones 2 to 3 inches in diameter caused extensive damage to buildings and automobiles in an area from northeast of Boulder to Longmont. Two funnel clouds were reported near Castle Rock. A funnel cloud and 1 inch hail stones were reported 10 to 20 miles southeast of Stapleton International Airport. Hail stones to 1 3/4 inches fell 3 miles west of Littleton. Hail to 3/4 inch diameter fell over southeast Denver.
In 1988…thunderstorm winds clocked to 60 mph unroofed a porch and downed a fence at a home near Stapleton International Airport. A small tornado touched down briefly in northeast Aurora. Another small tornado touched down for 3 minutes in southeast Aurora. No damage was reported from either twister.
In 1989…a national weather service observer saw lightning strike 2 storage tanks at 40th and Havana…3/8 mile northeast of Stapleton International Airport. The strike temporarily knocked out some weather observing equipment at the national weather service.
In 1991…a tornado was sighted 2 miles south of Castle Rock. No damage was reported. The funnel cloud associated with the tornado was sighted for 5 minutes by National Weather Service observers at Stapleton International Airport.
In 1994…lightning struck a home in Denver…which started a fire in the attic and caused minor damage.
In 1997…lightning struck a security guard at the castle pines golf course near Castle Rock. He received only minor injuries.
In 1999…severe thunderstorms rolled off the foothills over metro Denver…producing large hail and damaging winds. Hail to 1 inch diameter fell near Evergreen with 1 3/4 inch hail measured west of Golden. Hail to 1 1/2 inches fell in Commerce City with one inch hail in Lakewood…wheat ridge… The city of Denver and at Denver International Airport where thunderstorm winds gusted to 58 mph. As the storms moved east…3/4 inch hail was reported in Aurora…and damaging thunderstorm winds developed between Bennett and Strasburg. Winds gusting as high as 69 mph blew half a metal roof from a shed in a Bennett lumberyard. A small barn was also leveled between Bennett and Strasburg. Winds also gusted to 58 mph near Manilla.
In 2000…a dry microburst produced a wind gust to 58 mph at Jefferson County Airport. Thunderstorm winds gusted to 55 mph at Denver International Airport.
In 2003…hail as large as 1 3/4 inches was measured at centennial airport and near Parker.
In 2005…hail to 7/8 inch in diameter was reported near Parker with 3/4 inch hail measured near Castle Rock.
In 2009…lightning struck an apartment complex…a veterinary hospital in Boulder and caused minor damage. Lightning also struck two oil tanks…one in Boulder and the other at Front Range airport north of Watkins. The oil tanks in both instances were set on fire and suffered extensive damage.
In 2010…a complex of severe thunderstorms hammered portions of eastern Arapahoe…eastern Douglas and western Elbert counties. The hail ranged from 1 inch to 3 inches in diameter. The largest hail was observed near Elizabeth. Areas in and around Aurora…Byers…Parker and Thornton were also impacted by large hail. One weak tornado touched down near prospect valley but did no damage. At Denver International Airport…a peak wind gust to 35 mph was observed from the northwest.
10-11
In 1882…heavy thunderstorm rains on the morning of the 10th caused a rapid rise in Dry Creek…which enters the South Platte River at Fairview in present day south Denver. This…combined with additional heavy rainfall on the 11th caused the South Platte River to overflow. Five people drowned and several houses were destroyed. Total losses in the city and suburbs was estimated at 75 thousand dollars. Total rainfall in central Denver was 2.21 inches over the 2 days.
