These 25 Cities Are Smashing Heat Records at an Astonishing Pace
Last month, 187 counties – representing 6.3% of the U.S. population – experienced their hottest Septembers on record. Of those counties, 13 broke records that were set just the year prior.
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As climate change heats the planet, cities and counties will continue to break records at an increasingly astonishing pace. Yesterday’s anomaly will become tomorrow’s normal, which will continue to climb to hotter and more dangerous extremes. A look at monthly temperature records since 1970 reveals the high-risk, fast-changing cities where new monthly highs are being set at the highest velocity.
To determine the cities breaking temperature records at the highest velocity, Climate Crisis 247 reviewed county-level data on monthly temperature records from the NOAA. County seats were ranked based on the number of years since 1970 in which a new monthly high temperature was set in one of the 12 months throughout the year. Data on disaster risk is based on FEMA’s National Risk Index for Natural Hazards. Data is at the county level.
25. New London, CT (New London County)
- Annums with new monthly high temperature since 1970: 19 out of 55 years
- Most recent temperature record set: July 2023 (high of 83.6°F)
- FEMA disaster risk level: Relatively moderate
24. Jersey City, NJ (Hudson County)
- Annums with new monthly high temperature since 1970: 19 out of 55 years
- Most recent temperature record set: July 2024 (high of 88.6°F)
- FEMA disaster risk level: Relatively moderate
23. Manhattan, NY (New York County)
- Annums with new monthly high temperature since 1970: 19 out of 55 years
- Most recent temperature record set: July 2023 (high of 87.4°F)
- FEMA disaster risk level: Relatively high
22. Vero Beach, FL (Indian River County)
- Annums with new monthly high temperature since 1970: 19 out of 55 years
- Most recent temperature record set: July 2024 (high of 91.3°F)
- FEMA disaster risk level: Relatively high
21. Martinez, CA (Contra Costa County)
- Annums with new monthly high temperature since 1970: 19 out of 55 years
- Most recent temperature record set: July 2024 (high of 93.2°F)
- FEMA disaster risk level: Very high
20. Fort Lauderdale, FL (Broward County)
- Annums with new monthly high temperature since 1970: 19 out of 55 years
- Most recent temperature record set: May 2024 (high of 92.9°F)
- FEMA disaster risk level: Very high
19. Cape May, NJ (Cape May County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2023 (high of 86.1°F)
- FEMA disaster risk level: Relatively moderate
18. Vernal, UT (Uintah County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2021 (high of 89.8°F)
- FEMA disaster risk level: Very low
17. Belvidere, NJ (Warren County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2023 (high of 84.5°F)
- FEMA disaster risk level: Relatively low
16. White Plains, NY (Westchester County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2023 (high of 86.5°F)
- FEMA disaster risk level: Relatively moderate
15. Somerville, NJ (Somerset County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2023 (high of 87.4°F)
- FEMA disaster risk level: Relatively moderate
14. Flemington, NJ (Hunterdon County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2023 (high of 85.9°F)
- FEMA disaster risk level: Relatively low
13. Boston, MA (Suffolk County)
- Annums with new monthly high temperature since 1970: 20 out of 55 years
- Most recent temperature record set: July 2022 (high of 87.6°F)
- FEMA disaster risk level: Relatively moderate
12. Paterson, NJ (Passaic County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: July 2024 (high of 86.9°F)
- FEMA disaster risk level: Relatively moderate
11. Hartford, CT (Hartford County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: July 2024 (high of 85.8°F)
- FEMA disaster risk level: Relatively moderate
10. Bronx, NY (Bronx County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: July 2024 (high of 87.5°F)
- FEMA disaster risk level: Relatively high
9. Truth or Consequences, NM (Sierra County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: July 2023 (high of 98.1°F)
- FEMA disaster risk level: Very low
8. New Brunswick, NJ (Middlesex County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: July 2023 (high of 88.4°F)
- FEMA disaster risk level: Relatively high
7. South Kingstown, RI (Washington County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: July 2023 (high of 82.4°F)
- FEMA disaster risk level: Relatively low
6. Los Angeles, CA (Los Angeles County)
- Annums with new monthly high temperature since 1970: 21 out of 55 years
- Most recent temperature record set: August 2022 (high of 93.2°F)
- FEMA disaster risk level: Very high
5. Crescent City, CA (Del Norte County)
- Annums with new monthly high temperature since 1970: 22 out of 55 years
- Most recent temperature record set: July 2024 (high of 86.7°F)
- FEMA disaster risk level: Relatively moderate
4. Trenton, NJ (Mercer County)
- Annums with new monthly high temperature since 1970: 22 out of 55 years
- Most recent temperature record set: July 2024 (high of 89.8°F)
- FEMA disaster risk level: Relatively moderate
3. Miami, FL (Miami-Dade County)
- Annums with new monthly high temperature since 1970: 22 out of 55 years
- Most recent temperature record set: July 2024 (high of 92.8°F)
- FEMA disaster risk level: Very high
2. Riverhead, NY (Suffolk County)
- Annums with new monthly high temperature since 1970: 23 out of 55 years
- Most recent temperature record set: August 2022 (high of 85.0°F)
- FEMA disaster risk level: Relatively high
1. Hackensack, NJ (Bergen County)
- Annums with new monthly high temperature since 1970: 24 out of 55 years
- Most recent temperature record set: July 2024 (high of 88.4°F)
- FEMA disaster risk level: Relatively high
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