It was ridiculously warm today, certainly something we would expect to see in early October, not November. The mercury readings resulted in Denver setting two records.
The high temperature, as measured at Denver International Airport, reached 83 degrees. This sets a new high temperature record for the date, besting the old record of 78 degrees set in 1931.
Also, the 83 degree reading sets a record high temperature for the month of November. The previous warmest November reading was 81 degrees on November 27, 2017.
Here in Thornton, we also topped out at 83 degrees. This was the warmest November 2nd and the warmest November reading overall in the 19 years this station has been in operation.
80 degree readings in November are a rarity. In fact, today’s is only the fifth in Denver since record keeping began in 1872.
The weather during the month of November in Denver metro area can offer just about anything. While it is normally a quiet month, it can be prone to extremes.
November has historically been one of Denver’s snowiest months and major snowstorms are not entirely uncommon. However conditions can also be quite dry.
Temperatures during the month continue to cool as we get closer to winter and by the end of the month the low temperatures routinely dip to 20 degrees or below. At times it can in fact bring conditions more like what we see in January.
Thornton, Colorado’s September 2025 temperature summary. (ThorntonWeather.com)
Thornton was finally able to break out of the hot, dry weather pattern of recent months and see things get a bit more normal. September historically is one of our most pleasant months and 2025 largely held true to that.
We did start out pretty mild and precipitation was meager for the first half of the month. Finally, on the 13th, we began to see things cool down and then on the 16th got a nice shot of rain (0.61”).
The rest of the month offered mild but comfortable temperatures. A strong trough on the 23rd cooled us considerably with that day offering high temperatures nearly 20 degrees below normal. It also brought a very healthy shot of rain (1.21″).
In the end, the average temperature for the month of September ended up very close to average. Thornton’s average for the month was 64.6 degrees. This was just a hair higher than our 19 year running average for the month of 64.3 degrees. Our maximum temperature for the month was 92 degrees and came on the 10th. Our coolest reading of 42.3 degrees was on the 25th.
For Denver, at Denver International Airport where the Mile High City’s official measurements are taken, temperatures were on par with ours. They reported an average for the month of 64.7 degrees. This was close to their long term average for September of 64.8 degrees.
In terms of precipitation, Thornton saw a notable 2.09 inches for the month. This was far above our 19-year running average of 1.51 inches for September. This was the fourth wettest September over that period.
The Mile High City was quite a bit drier with 1.35 inches recorded in their rain bucket. It was, however, above their long term average for the month of 1.09 inches.
No snow was recorded in Thornton or Denver for the month.
With the first full month of fall here, October usually brings one of the quietest weather months in the Denver area with plenty of mild, sunny days and clear, cool nights.
October is historically the second sunniest month and conditions are generally calm.
However we also will usually see our first taste of winter during the month with the first freeze and first snowfall of the season. Temperatures as well will start to drop and by the end of the month the average nighttime lows are below freezing.
Thornton, Colorado temperature summary for August 2025. (ThorntonWeather.com)
A recurring theme from most of 2025 for August. Thornton once again saw temperatures above normal and precipitation below, something that has happened far too often this year.
Above normal temperatures dominated the first three weeks of the month. Mercury readings in the 90s were common with only three days being below that mark. Precipitation was absolutely scarce with a mere 0.01 inches being recorded during the first 21 days of the month.
Thankfully, Mother Nature took mercy on us for the last 10 days of August. We saw temperatures cool a good bit with every day seeing below average readings. While precipitation wasn’t great, she also was kind enough to finally give us a couple days with much-needed rain.
Temperatures in Thornton came in at an average of 72.6 degrees for the month. This was a good bit above the 19-year running average for August of 71.8 degrees. It was also the sixth month in a row for Thornton with above average temperatures.
Out at DIA where Denver’s official records are taken, it was a good bit warmer. The Mile High City saw an average of 73.8 degrees for August 2025. This was above their long term average for August of 72.9 degrees.
In terms of precipitation, Thornton ended up with 0.51 inches in the bucket. Virtually all of that fell in the last seven days of the month. It was well below our running August average of 1.20 inches.
For Denver, they saw two days with thunderstorms that dumped a great deal of rain on the airport, storms that missed us. As a result, their rain total for the month was a surprising 4.12 inches. This was well above their long term average for August of 1.58 inches.
Following an August that was unseasonably warm, we find ourselves heading into September hoping for relief. The month can bring plenty of rain and even our first snow of the season but more often than not, it is one of the most pleasant along the Colorado Front Range.
As temperatures start to drop, September usually 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.
The month can bring extremes however. We will of course forever remember 2013’s devastating floods brought on by record-setting rain. Longtime residents might remember September 1971 which brought over 17 inches of snowfall.
The Farmers’ Almanac released its 2025 – 2026 winter outlook and if it were to bear out, Colorado could be in for some harsh, wintry weather.
The publication portends a “very cold, snowy” winter for the north central plains. It says the region is, “set for a classic winter wonderland.”
Founded in 1818, the Farmers’ Almanac’s forecasts use a “tried-and-true formula that adapts to the mysteries of nature and the ever-changing world in which we live. The basis of our prediction method was developed by our founding editor according to correlations between celestial events, and various meteorological conditions.”
Of course, long range forecasts this far out, no matter who is making them, have to be taken with a grain of salt. However, as Thornton has seen four straight snow seasons with below normal levels of the white stuff, a change might be welcome.
As summer vacations wind down and families prepare to send their kids back to school in August, Colorado weather also starts to settle down. The chances for severe weather decrease markedly during August and by the end of the month daytime temperatures are dropping quite a bit as well.
Thornton, Colorado’s July 2025 Temperature Summary. (ThorntonWeather.com)
If you were thinking the past month was hot and dry, you would certainly be correct. Thornton’s July saw average mercury readings a good bit above average and precipitation well below average.
Looking back, probably one of the most notable things about the month was that there wasn’t a whole lot notable. We saw nothing significant in the way of severe weather and while it was hot, it wasn’t overly extreme. It was noteworthy that the last two weeks of the month were quite dry yielding only 0.03” of rain over the period.
Thornton’s average temperature for the month came in at 75.2 degrees. This was a good bit above our running 18 year average for July of 73.9 degrees. Temperatures ranged from a high of 102.1 degrees on the 9th down to 55.3 degrees on the 11th.
Out at DIA where the Mile High City’s official measurements are taken, similar readings were seen. Denver saw an average temperature for the month of 75.1 degrees. This actually matched their long-term average for July.
In terms of precipitation, Thornton saw 0.63 inches fall in its rain bucket. The majority of that fell during the first half of the month. That is well below our running average for July of 1.88 inches.
For Denver, they recorded similar precipitation with 0.64 inches being recorded. This was well below their July average of 2.14 inches.
Thornton, Colorado’s June 2025 Temperature Summary. (ThorntonWeather.com)
Finally, a break from the heat and some much-needed precipitation. Thornton’s average temperature for the month came in a bit above average but not by much. In terms of precipitation, we saw a good bit above average levels.
