The Cities Where It Is +100°F For 100+ Days a Year
https://climate-crisis-247-bucket.nyc3.cdn.digitaloceanspaces.com/wp-content/uploads/2025/07/07212919/bspfnduckou-150x150.jpgAs cities from Washington, D.C. to Boston emerge from an early season heat wave, many East Coasters are breathing a sigh of cautious relief. At some metropolitan weather monitoring stations, temperatures hit 100°F for the first time in over a decade, with dozens of smaller cities shattering local heat records.
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In some parts of the country, however, residents endure 100°F heat for nearly a third of the year. In several cities in Arizona and California, temperatures regularly hit 100°F for more than three continuous months – more than 100 days in a row. 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
- 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
- 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
- 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
- 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
- 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
- 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
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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
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