This past Sunday was officially the last day of summer. Fall began at 1:50 a.m. Monday with the autumnal equinox.
As you may recall the summer of 2019 got off to a late start with snow in town into early June. You could also say it had an early finish with the first snow in the mountains coming in early September.
From the Jackson Climate Station, average monthly high temperatures were below average in June, July and August this year.
June’s and July’s average high temperatures were both 4 degrees cooler than the long-term average monthly highs. August was about 2 degrees cooler than average.
Overall, the average high temperature for the whole summer was just shy of 75 degrees (74.6 degrees to be exact), a little more than 3 degrees cooler than the long-term average summer high temperature of 78 degrees.
An obvious trend has been established over the last six summers of cooler-than-normal daytime high temperatures in Jackson. It also seems that exceeding 90 degrees has almost become a thing of the past.
Not so hot (anymore)
The hottest day of the summer this year was July 23, when it reached 87 degrees. In the summer of 2018 the highest temperature recorded was 90 degrees on Aug. 11. Before that it had been 10 years since it tagged 90 degrees in Jackson; that was back on Aug. 1, 2008.
It has now been 12 years since Jackson has had an official high temperature above 90 degrees. That was back on July 23, 2007, when it was 92 degrees.
July 2007 was exceptionally warm, with 13 days with temps of 90 degrees or warmer, maxing out at 94 degrees early in the month. The average high temperature in July 2007 was 89 degrees. That is 7 degrees above the average high in July of 82 degrees and 11 degrees warmer than it was this July (at 78 degrees). In more recent times, 2007 was the last really hot summer we’ve had.
Historically speaking though, nothing compares to the summer of 1934. That was truly the hottest summer on record in Jackson. July 1934 alone had 14 days of 90 degrees or hotter.
There actually may have been more than 14 days above 90 degrees in July 1934, because no temperatures were recorded on six days during that month. Even with those missing days the average July high temperature was 92 degrees in town. That’s 14 degrees warmer than it was this July.
By the way, on two of those 14 days in July 1934, Jackson reached its all-time record high of 101 degrees.
So if you whined at all about it being too hot in Jackson this summer, you shouldn’t have!
For more on summer weather trends, including insights on low temperatures, check out meteorologist Jim Woodmencey's full column in the Jackson Hole News&Guide.