Look back at last month, we see that Thornton experienced an unusually warm month, one punctuated by a couple rare 70 degree January days. Precipitation fell short of normal as did snowfall.
The month started out on the cold side with three of the first four days failing to reach temperatures above freezing. Some light snow was also recorded on the 2nd and 3rd of the month.
We then began a bit of a temperature rollercoaster with above normal readings for two days, a turn toward colder temperatures on the 9th, back to warmth on the next day and then colder than normal for the next four days.
Fourteen of the last 17 days of the month then recorded temperatures at or above normal. The 26th and 27th saw amazing readings above 70 degrees.
Overall, Thornton’s average temperature for the month came in at 33.7 degrees. That was well above Denver’s January average of 30.7 degrees. Out at Denver International Airport where the city’s official records are taken, the month saw a 33.9 degree average.
Thornton’s warmest reading of 74.5 degrees came on the 27th. Its coldest of -3.7 degrees occurred early in the morning of the 4th. Denver’s warmest and coldest readings came on the same days. DIA recorded 75 degrees on the 27th and -10 degrees on the 4th.
In terms of precipitation, 0.20 inches of liquid precipitation was recorded in Thornton. Denver nearly doubled our number with 0.38 inches. Both locations fell shy of Denver’s January average precipitation of 0.41 inches.
Snowfall in Thornton totaled only 3.5 inches, exactly have of Denver’s January average of 7.0 inches. Here again the airport bested us with 7.2 inches this January.
Click here to view Thornton’s January 2015 climate report.
From the National Weather Service:
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
614 AM MST SUN FEB 1 2015
...................................
...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2015...
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2015
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
................................................................
TEMPERATURE (F)
RECORD
HIGH 76 01/27/1888
LOW -29 01/09/1875
HIGHEST 75 01/27 65 01/19
LOWEST -10 01/04 -10 01/05
AVG. MAXIMUM 46.7 44.0 2.7 44.9
AVG. MINIMUM 21.0 17.4 3.6 17.3
MEAN 33.9 30.7 3.2 31.1
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 5 5.5 -0.5 4
DAYS MIN <= 32 27 29.4 -2.4 30
DAYS MIN <= 0 3 1.7 1.3 3
PRECIPITATION (INCHES)
RECORD
MAXIMUM 2.35 1883
MINIMUM 0.01 1933
1934
1952
TOTALS 0.38 0.41 -0.03 0.94
DAILY AVG. 0.01 0.01 0.00 0.03
DAYS >= .01 5 4.1 0.9 9
DAYS >= .10 1 0.9 0.1 3
DAYS >= .50 0 0.0 0.0 0
DAYS >= 1.00 0 0.0 0.0 0
GREATEST
24 HR. TOTAL 0.12 01/21
STORM TOTAL 0.14 01/20(19) TO 01/21(16)
SNOWFALL (INCHES) JANUARY NORMAL
TOTALS 7.2 7.0
DEGREE_DAYS
HEATING TOTAL 958 1063 -105 1046
SINCE 7/1 3249 3531 -282 3497
COOLING TOTAL 0 0 0 0
SINCE 1/1 0 0 0 0
FREEZE DATES
RECORD
EARLIEST 09/08/1962
LATEST 06/08/2007
EARLIEST 10/07
LATEST 05/05
..................................................
WIND (MPH)
AVERAGE WIND SPEED 9.7
RESULTANT WIND SPEED/DIRECTION 3/229
HIGHEST WIND SPEED/DIRECTION 37/290 DATE 01/17
HIGHEST GUST SPEED/DIRECTION 46/270 DATE 01/05
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.60
NUMBER OF DAYS FAIR 5
NUMBER OF DAYS PC 16
NUMBER OF DAYS CLOUDY 10
AVERAGE RH (PERCENT) 62
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 1 FREEZING RAIN 0
LT FREEZING RAIN 2 HAIL 0
HEAVY SNOW 1 SNOW 4
LIGHT SNOW 12 SLEET 0
FOG 16 FOG W/VIS <= 1/4 MILE 6
HAZE 6
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
As we begin the new year the winter chill begins to set in. While January can see its share of extremes, the month historically sees stable temperatures and is usually relatively dry.
Our recent blast of Arctic air sent the mercury tumbling and in the process broke two daily records for December 30th.
The month of December brings with it the official start of winter and oftentimes, colder and snowier weather conditions. It however can also offer unseasonably warm temperatures and bone dry conditions.
