100 Degree Weather Facts for the DFW Area

We are now approaching the time of year where the heat and humidity settles in and rain isn’t as common. Although it is starting to warm up, the really hot weather (100 degrees +) doesn’t typically arrive until July & August—most of our 100-degree days in the DFW area (15.2 of our average of 18) occur in July & August.

Thanks to the National Weather Service, following is some more information concerning 100-degree days in the DFW area:

• Average date of first 100°F: July 1
  • 2021—July 25^th
  • 2020—July 12^th
  • 2019—July 30^th
  • 2018—June 22^nd
  • 2017—June 23^rd
  • 2016—July 22^nd
  • 2015—July 26^th
  • 2014—July 13^th
• Average date of last 100°F: August 26
  • 2021—Sept. 20^th
  • 2020—Aug. 29^th
  • 2019—Sept. 7^th
  • 2018—Aug. 18^th
  • 2017—Aug. 19^th
  • 2016—Sept. 20^th
  • 2015—Sept. 7^th
  • 2014—Sept. 10^th
• Earliest occurrence: Mar 9, 1911 (100°F)
• Latest occurrence: Oct 3, 1951 (106°F)
• Average number of 100 degree days: 18
  • 2021—8 total 100 degree days
  • 2020—9 total 100 degree days
  • 2019—14 total 100 degree days
  • 2018—23 total 100 degree days
  • 2017—10 total 100 degree days
  • 2016—18 total 100 degree days
  • 2015—15 total 100 degree days
  • 2014—15 total 100 degree days
• Most in a calendar year: 71 (2011)
• Fewest in a calendar year: 0 (1973 & 1906)
• Most consecutive: 42 (1980)
• Most in a month: 31 (July 1980)
  • Average number of 100 degree days by monthMay—0.2 day
  • June—1.2 days
  • July—6.0 days
  • August—9.2 days
  • September—1.0 day

• Highest temperature ever recorded: 113 degrees (1980)
  • 2021—102 degrees 2017—102 degrees
  • 2020—106 degrees 2016—107 degrees
  • 2019—102 degrees 2015—106 degrees
  • 2018—109 degrees 2014—104 degrees

In the record-breaking year of 2011 when we had 71 days of at least 100 degrees, we had our first 100 degree day on June 13^th and our last one on September 29^th—what a summer to remember! July was brutal that year with all but one day reaching 100 degrees. For those of you who were in DFW in 1980, every single day in July reached 100 degrees!

Happy swimming!