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Denver Climatological Preview - September 2010 |
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Preview of Thornton's September Weather - Summer Ends and Fall Arrives
Normal highs on the first of the month are 82 degrees with a low of 53. By the end of the month we see those high temperatures drop to an average of 73 and the lows get to a chilly 42. Overall the month averages 62.4 degrees. In some years summer hangs on as late as the end of September - right to the last day of the month. September 30, 1980 saw a record high temperature of 90 degrees. 97 degrees is the hottest temperature ever recorded for the month - that happening on four occasions, the most recently on September 1st and 5th in 1995. Interestingly enough, all but four days of the month have recorded record highs in the 90s! The ones that haven't - the 21st, 22nd, 24th and 28th - have record temperatures pretty close of either 88 or 89 degrees. The chance for thunderstorms still exists in September but they are infrequent and severe ones are pretty rare. All that sounds great for lovers of warm weather but winter too can make appearances in September - in fact, it can appear early on. The earliest measurable snow happened on September 3, 1961 when 4 inches of the white stuff fell at the old Stapleton International Airport and the mercury dropped to 33 degrees. The snowiest September on record occurred in 1971 which 17.2 inches of snow was recorded. Freezing has occurred in Denver as early as September 8, 1962 with a low of 31 degrees. Winter really hit home in 1985 when on September 29th, 9 inches of snow fell and Denver had a low of 17 degrees and a high of 29. Having said that though, in the 128 years since 1882, 84 Septembers have passed without a trace of snow. At the current time, Denver has gone nine Septembers in a row without snow being recorded with the last being in September 2000 when 0.2 inch was recorded. In conclusion, September can bring just about anything but the odds do favor a beautiful month. Looking back at September 2009 – A quiet month September 2009 was a relatively quiet month both in terms of precipitation and temperature. Denver finished the month with temperatures slightly above normal. The highest temperature of the month of 91 degrees was recorded on the 1st and the coldest was a low of 36 degrees recorded on the 28th. The 91 degree mark was the only 90+ degree day for the month which was one below average. Thornton's temperatures ranged from a high of 89.7 down to a low of 35.9 degrees. Overall the month had an average temperature of 63.5 degrees which was 1.1 degrees above normal. Thornton was slightly cooler with an average temperature of 61.5 degrees. There were no temperature records set during the month. In terms of precipitation, it was relatively dry when compared to average. 0.74 inch was recorded which was 0.40 inch below normal. Five days had measureable precipitation with four of those recording more than 0.10 inch. The highest 24 hour precipitation amount was recorded between the 22nd and 23rd when 0.42 was recorded. In Thornton we fared slightly wetter having recorded 0.80 inch during the month. No precipitation records were set or tied. Six thunderstorm days were recorded and eight days had light fog. One day had dense fog. The peak wind gust of 45 mph was recorded on the 7th and the 30th. Outlook for September 2010 Long range climate outlooks from the National Weather Service do not favor any particular pattern for temperature and indicate below normal precipitation is possible. Climatological normals should be used for guidance (below). For More Information Temperature Normals and Extremes for September Monthly Temperature, Rainfall and Snowfall Extremes for September
* Historical weather statistics gathered from the National Weather Service's Denver / Boulder forecast office data archives. |
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As temperatures start to drop, September reminds us that summer is at an end and fall is now here. Sunshine is predominant though as the month actually has the highest percentage of sun out of any month. Sunny days and clear, cool nights are the standard weather pattern for the month. 
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