16 Cities With Over 100 Days of Triple-Digit Temperatures Every Year

By Evan Comen  •  October 16, 2025
A woman stands on a sunny pathway outdoors with a backpack, enjoying a summer day.https://climate-crisis-247-bucket.nyc3.cdn.digitaloceanspaces.com/wp-content/uploads/2025/10/15122356/3779743-150x150.jpeg

While much of the United States is just starting to brace for a sweltering summer, some cities have been dealing with extreme heat for months. In some parts of the Southwest, residents endure 100°F heat for nearly a third of the year. And as global warming continues to warm the climate, triple-digit heat is becoming more and more common.

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Nationwide, there are dozens of major cities where the daily maximum tops 100°F in an average year. In several cities in Arizona and California, temperatures regularly hit 100°F for more than three continuous months. And while temperatures are highest in the Southwest, triple-digit heat regularly occurs in cities as far north as Idaho and as far east as Austin, Texas. A closer look at the data reveals the cities where temperatures hit 100°F the most often.

To determine the 16 cities where it is more than 100°F for more than 100 days a year, Climate Crisis 247 reviewed historical station-level data from the NOAA’s Global Historical Climatology Network program. Stations were ranked based on the number of days where the average daily maximum exceeded 100°F from 2006 to 2020. Stations were matched to places using Census Bureau boundaries and nearest neighbor analysis in QGIS. Only cities with at least 25,000 residents were considered.

16. Glendale, AZ

Photo by Avi Waxman on Unsplash

  • No. +100°F days in an average year: 101 days
  • Earliest +100°F day in average year: June 4 (100.0°F)
  • Hottest +100°F day in average year: July 1 (106.3°F)
  • Total population: 248,083
 

15. Peoria, AZ

Photo by Avi Waxman on Unsplash

  • No. +100°F days in an average year: 102 days
  • Earliest +100°F day in average year: June 5 (100.2°F)
  • Hottest +100°F day in average year: July 1 (106.1°F)
  • Total population: 191,292
 

14. Apache Junction, AZ

Photo by Tyler Garben on Unsplash

  • No. +100°F days in an average year: 103 days
  • Earliest +100°F day in average year: June 3 (100.0°F)
  • Hottest +100°F day in average year: June 29 (106.2°F)
  • Total population: 38,855
 

13. Goodyear, AZ

Photo by Brady Cook on Unsplash

  • No. +100°F days in an average year: 107 days
  • Earliest +100°F day in average year: May 31 (100.1°F)
  • Hottest +100°F day in average year: June 30 (108.1°F)
  • Total population: 97,542
 

12. La Quinta, CA

Photo by Diane Carmony on Unsplash

  • No. +100°F days in an average year: 108 days
  • Earliest +100°F day in average year: June 4 (100.1°F)
  • Hottest +100°F day in average year: July 7 (108.4°F)
  • Total population: 37,933
 

11. Florence, AZ

Photo by Jefferson Sees on Unsplash

  • No. +100°F days in an average year: 109 days
  • Earliest +100°F day in average year: May 30 (100.0°F)
  • Hottest +100°F day in average year: June 26 (107.6°F)
  • Total population: 25,783
 

10. Mesa, AZ

Photo by Kyle Johnson on Unsplash

  • No. +100°F days in an average year: 109 days
  • Earliest +100°F day in average year: May 31 (100.0°F)
  • Hottest +100°F day in average year: June 28 (107.6°F)
  • Total population: 503,390
 

9. El Centro, CA

Photo by Joseph Vogel on Pexels

  • No. +100°F days in an average year: 109 days
  • Earliest +100°F day in average year: June 5 (100.0°F)
  • Hottest +100°F day in average year: July 6 (107.5°F)
  • Total population: 44,184
 

8. Tempe, AZ

Photo by Silvio Wiggelinghoff on Unsplash

  • No. +100°F days in an average year: 110 days
  • Earliest +100°F day in average year: June 1 (100.3°F)
  • Hottest +100°F day in average year: June 29 (107.3°F)
  • Total population: 181,005
 

7. Yuma, AZ

Photo by Tyler Scheviak on Unsplash

  • No. +100°F days in an average year: 111 days
  • Earliest +100°F day in average year: June 2 (100.3°F)
  • Hottest +100°F day in average year: July 5 (107.6°F)
  • Total population: 96,314
 

6. Fortuna Foothills, AZ

Photo by Joseph Hughes on Unsplash

  • No. +100°F days in an average year: 113 days
  • Earliest +100°F day in average year: June 1 (100.1°F)
  • Hottest +100°F day in average year: July 2 (107.9°F)
  • Total population: 27,552
 

5. Lake Havasu City, AZ

Photo by Chris Kofoed on Unsplash

  • No. +100°F days in an average year: 113 days
  • Earliest +100°F day in average year: May 31 (100.2°F)
  • Hottest +100°F day in average year: July 3 (109.8°F)
  • Total population: 57,294

4. Palm Springs, CA

Photo by Cody Board on Unsplash

  • No. +100°F days in an average year: 114 days
  • Earliest +100°F day in average year: June 1 (100.1°F)
  • Hottest +100°F day in average year: July 6 (109.4°F)
  • Total population: 44,935
 

3. Coachella, CA

Photo by Logan Voss on Unsplash

  • No. +100°F days in an average year: 114 days
  • Earliest +100°F day in average year: June 1 (100.2°F)
  • Hottest +100°F day in average year: July 5 (108.5°F)
  • Total population: 42,279
 

2. Casa Grande, AZ

Photo by Georg Baumann on Unsplash

  • No. +100°F days in an average year: 114 days
  • Earliest +100°F day in average year: May 27 (100.1°F)
  • Hottest +100°F day in average year: June 26 (108.9°F)
  • Total population: 55,186
 

1. Bullhead City, AZ

Photo by Natalie Wagner on Unsplash

  • No. +100°F days in an average year: 115 days
  • Earliest +100°F day in average year: May 30 (100.1°F)
  • Hottest +100°F day in average year: July 5 (110.6°F)
  • Total population: 41,593