{"id":17953,"date":"2017-10-05T12:57:03","date_gmt":"2017-10-05T18:57:03","guid":{"rendered":"http:\/\/www.thorntonweather.com\/blog\/?p=17953"},"modified":"2017-10-06T05:40:31","modified_gmt":"2017-10-06T11:40:31","slug":"september-2017-weather-recap-month-starts-warm-and-dry-ends-cool-and-damp","status":"publish","type":"post","link":"https:\/\/www.thorntonweather.com\/blog\/thornton-weather\/september-2017-weather-recap-month-starts-warm-and-dry-ends-cool-and-damp\/","title":{"rendered":"September 2017 weather recap: Month starts warm and dry, ends cool and damp"},"content":{"rendered":"

The month of September 2017 saw significant differences between the start and the end.\u00a0 The first two-thirds of the month were extraordinarily dry with temperatures well above normal. The last 10 days brought a big change though with damp conditions and much cooler conditions.<\/p>\n

High pressure dominated the region for the first few weeks of the month.\u00a0 During this period when we normally see cooler temperatures, we instead saw highs oftentimes at or above 90 degrees and a couple of record high readings.\u00a0 Additionally, it was exceedingly dry with Thornton only received 0.03 inches of precipitation through the first 22 days of the month.<\/p>\n

Big changes arrived and the last nine days of the month stood it stark contrast to the rest of September. Low pressure and a series of disturbances brought much cooler temperatures and much-needed precipitation, including snowfall in the high country. Seven out of the last eight days saw below normal high temperature readings and enough precipitation fell to push us to just above normal.<\/p>\n

Thornton\u2019s overall average temperature for the month came in at 62.4 degrees.\u00a0 This was a full degree cooler than Denver\u2019s long term September average of 63.4 degrees.\u00a0 Out at DIA where Denver\u2019s official measurements are taken, it was a good bit warmer with an average temperature of 65.1 degrees.<\/p>\n

Temperatures in Thornton ranged from a high of 98.5 degrees on the third and a low of 40.9 degrees on the morning of the 29th.\u00a0 Denver saw their high of 97 degrees on the third as well and their coldest reading of 40 degrees on the 20th.<\/p>\n

Two record high temperatures were officially set or tied for the Mile High City.\u00a0 The high temperature of 97 degrees on the third tied the record high for the date.\u00a0 A reading of 92 degrees on the 21st set a new record high for that date.<\/p>\n

In terms of precipitation, Denver averages 0.96 inches during September.\u00a0 Thornton tallied 1.05 inches in the rain bucket while Denver bested us with 1.26 inches.<\/p>\n

Click here to view Thornton\u2019s September 2017 climate report<\/a>.<\/p>\n

\"Thornton,<\/a>
Thornton, Colorado\u2019s September 2017 Temperature Summary. (ThorntonWeather.com)<\/figcaption><\/figure>\n
\"Thornton,<\/a>
Thornton, Colorado\u2019s September 2017 Precipitation Summary. (ThorntonWeather.com)<\/figcaption><\/figure>\n

From the National Weather Service:<\/p>\n

CLIMATE REPORT\r\nNATIONAL WEATHER SERVICE DENVER\/BOULDER CO\r\n244 AM MDT SUN OCT 1 2017\r\n\r\n...................................\r\n\r\n...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...\r\n\r\nCLIMATE NORMAL PERIOD 1981 TO 2010\r\nCLIMATE RECORD PERIOD 1872 TO 2017\r\n\r\nWEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S\r\n                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)\r\n                                          NORMAL\r\n................................................................\r\nTEMPERATURE (F)\r\nRECORD\r\n HIGH              97   09\/03\/2017\r\n                        09\/06\/2013\r\n                        09\/05\/2013\r\n LOW               17   09\/29\/1985\r\nHIGHEST            97R  09\/03        91       6       93  09\/05\r\nLOWEST             40   09\/20        35       5       37  09\/10\r\nAVG. MAXIMUM     79.0              78.5     0.5     82.3\r\nAVG. MINIMUM     51.3              48.3     3.0     49.7\r\nMEAN             65.1              63.4     1.7     66.0\r\nDAYS MAX >= 90      9               3.4     5.6        6\r\nDAYS MAX <= 32      0               0.0     0.0        0\r\nDAYS MIN <= 32      0               0.8    -0.8        0\r\nDAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 5.61 2013 MINIMUM T 1892 1944 TOTALS 1.26 0.96 0.30 0.28 DAILY AVG. 0.04 0.03 0.01 0.01 DAYS >= .01         6               6.5    -0.5        4\r\nDAYS >= .10         2               3.3    -1.3        1\r\nDAYS >= .50         1               0.6     0.4        0\r\nDAYS >= 1.00        0               0.1    -0.1        0\r\nGREATEST\r\n 24 HR. TOTAL    0.83   09\/23 TO 09\/23           09\/12 TO 09\/12\r\n\r\nSNOWFALL (INCHES)\r\nRECORDS\r\n TOTAL             0.0\r\nTOTALS            0.0               1.3\r\n\r\nDEGREE_DAYS\r\nHEATING TOTAL     122               125      -3       64\r\n SINCE 7\/1        130               141     -11       79\r\nCOOLING TOTAL     131                76      55       99\r\n SINCE 1\/1        880               764     116      861\r\n\r\nFREEZE DATES\r\nRECORD\r\n EARLIEST     09\/08\/1962\r\n LATEST       06\/08\/2007\r\nEARLIEST                        10\/07\r\nLATEST                          05\/05\r\n...................................................\r\n\r\nWIND (MPH)\r\nAVERAGE WIND SPEED              9.6\r\nRESULTANT WIND SPEED\/DIRECTION   2\/165\r\nHIGHEST WIND SPEED\/DIRECTION    40\/020    DATE  09\/19\r\nHIGHEST GUST SPEED\/DIRECTION    48\/030    DATE  09\/19\r\n\r\nSKY COVER\r\nPOSSIBLE SUNSHINE (PERCENT)   MM\r\nAVERAGE SKY COVER           0.50\r\nNUMBER OF DAYS FAIR            9\r\nNUMBER OF DAYS PC             15\r\nNUMBER OF DAYS CLOUDY          6\r\n\r\nAVERAGE RH (PERCENT)     48\r\n\r\nWEATHER CONDITIONS. NUMBER OF DAYS WITH\r\nTHUNDERSTORM              0     MIXED PRECIP               0\r\nHEAVY RAIN                1     RAIN                       1\r\nLIGHT RAIN               10     FREEZING RAIN              0\r\nLT FREEZING RAIN          0     HAIL                       0\r\nHEAVY SNOW                0     SNOW                       0\r\nLIGHT SNOW                0     SLEET                      0\r\nFOG                       8     FOG W\/VIS <= 1\/4 MILE      1\r\nHAZE                     10\r\n\r\n-  INDICATES NEGATIVE NUMBERS.\r\nR  INDICATES RECORD WAS SET OR TIED.\r\nMM INDICATES DATA IS MISSING.\r\nT  INDICATES TRACE AMOUNT.<\/pre>\n","protected":false},"excerpt":{"rendered":"
The month of September 2017 saw significant differences between the start and the end.\u00a0 The first two-thirds of the month were extraordinarily dry with temperatures well above normal. The last 10 days brought a big change though with damp conditions and much cooler conditions. High pressure dominated the region for the first few weeks of … Continue reading September 2017 weather recap: Month starts warm and dry, ends cool and damp<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,7],"tags":[441],"_links":{"self":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/17953"}],"collection":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/comments?post=17953"}],"version-history":[{"count":4,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/17953\/revisions"}],"predecessor-version":[{"id":17969,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/posts\/17953\/revisions\/17969"}],"wp:attachment":[{"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/media?parent=17953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/categories?post=17953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thorntonweather.com\/blog\/wp-json\/wp\/v2\/tags?post=17953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}