24 Counties Where Summer Temperatures Will Be 10°F Above Normal

By Evan Comen • July 16, 2025

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Summer is getting noticeably hotter. Hundreds of municipalities break heat records every week, with average temperatures across the country rising every year. In 2024, average summer temperatures exceeded historical 20th century normals by at least 5°F in 41 counties, representing nearly 19 million Americans.

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This week, forecasters are warning that temperatures will exceed historical normals in dozens of counties. There are 213 counties under heat advisories from the National Weather Service -- approximately 12% of the country.

The most brutal temperature deviations will be in the Northeast, with pockets of Vermont and New Hampshire set to experience temperatures more than 10°F above normal. The Pacific Northwest will also experience significant temperature anomalies, concentrated in the western parts of Oregon and Washington. Meanwhile, Montana and the Dakotas will experience temperatures more than 5°F below normal for the summer months. A closer look at the data reveals the counties where temperatures will be abnormally high this week.

To determine the counties where temperatures will be abnormally high this week, Climate Crisis 247 reviewed data on historical temperature observations and temperature forecasts from the NOAA. Counties were ranked based on the difference in average forecast temperature for the period July 16-18, 2025 and historical average temperatures for June through August for the years 1901 to 2000. Supplemental data on population are from the U.S. Census Bureau.

25. Essex County, NY

Photo by Xavier Coiffic on Unsplash

Forecast average, July 16-18, 2025: 74.6°F (+11.9°F above summer normal)
Normal average, June-August, 1901-2000: 62.7°F
Total population: 37,077
County seat: Elizabethtown

24. Caledonia County, VT

Photo by Alex Moliski on Unsplash

Forecast average, July 16-18, 2025: 74.8°F (+11.9°F above summer normal)
Normal average, June-August, 1901-2000: 62.8°F
Total population: 30,425
County seat: St. Johnsbury

23. Bennington County, VT

Photo by William Alexander on Pexels

Forecast average, July 16-18, 2025: 74.3°F (+11.9°F above summer normal)
Normal average, June-August, 1901-2000: 62.3°F
Total population: 37,312
County seat: Manchester

22. Middlesex County, MA

Photo by MOHANN on Pixabay

Forecast average, July 16-18, 2025: 80.3°F (+12.0°F above summer normal)
Normal average, June-August, 1901-2000: 68.3°F
Total population: 1,622,896
County seat: Lowell

21. Grafton County, NH

Photo by Yilei (Jerry) Bao on Unsplash

Forecast average, July 16-18, 2025: 74.7°F (+12.0°F above summer normal)
Normal average, June-August, 1901-2000: 62.7°F
Total population: 91,759
County seat: North Haverhill

20. Addison County, VT

Photo by Austin on Unsplash

Forecast average, July 16-18, 2025: 77.0°F (+12.0°F above summer normal)
Normal average, June-August, 1901-2000: 65.0°F
Total population: 37,497
County seat: Middlebury

19. Rutland County, VT

Photo by Daniel Halseth on Unsplash

Forecast average, July 16-18, 2025: 75.6°F (+12.1°F above summer normal)

Normal average, June-August, 1901-2000: 63.6°F

Total population: 60,484

County seat: Rutland

18. Orange County, VT

Photo by Olivier Darny on Pexels

Forecast average, July 16-18, 2025: 75.6°F (+12.1°F above summer normal)
Normal average, June-August, 1901-2000: 63.5°F
Total population: 29,594
County seat: Chelsea

17. Washington County, OR

Photo by Josh Hild on Pexels

Forecast average, July 16-18, 2025: 74.3°F (+12.2°F above summer normal)
Normal average, June-August, 1901-2000: 62.2°F
Total population: 600,266
County seat: Hillsboro

16. Oxford County, ME

Photo by Thomas Dewey on Unsplash

Forecast average, July 16-18, 2025: 75.0°F (+12.2°F above summer normal)
Normal average, June-August, 1901-2000: 62.8°F
Total population: 58,728
County seat: Paris

15. Windham County, VT

Photo by Brett Sayles on Pexels

Forecast average, July 16-18, 2025: 76.0°F (+12.2°F above summer normal)
Normal average, June-August, 1901-2000: 63.8°F
Total population: 45,913
County seat: Newfane

14. Cheshire County, NH

Photo by Derrick Holt on Unsplash

Forecast average, July 16-18, 2025: 77.3°F (+12.2°F above summer normal)
Normal average, June-August, 1901-2000: 65.1°F
Total population: 76,945
County seat: Keene

13. Belknap County, NH

Photo by Wolfgang Hasselmann on Unsplash

Forecast average, July 16-18, 2025: 77.8°F (+12.3°F above summer normal)
Normal average, June-August, 1901-2000: 65.5°F
Total population: 64,300
County seat: Laconia

12. Hillsborough County, NH

Photo by srinivas Kodali on Unsplash

Forecast average, July 16-18, 2025: 78.7°F (+12.3°F above summer normal)
Normal average, June-August, 1901-2000: 66.4°F
Total population: 424,732
County seat: Nashua

11. Strafford County, NH

Photo by Sawyer Bergeron on Unsplash

Forecast average, July 16-18, 2025: 78.5°F (+12.3°F above summer normal)
Normal average, June-August, 1901-2000: 66.2°F
Total population: 131,743
County seat: Dover

10. Franklin County, ME

Photo by EEC on Unsplash

Forecast average, July 16-18, 2025: 73.4°F (+12.4°F above summer normal)
Normal average, June-August, 1901-2000: 61.1°F
Total population: 30,145
County seat: Farmington

9. Orleans County, VT

Photo by Nikunj Singh on Unsplash

Forecast average, July 16-18, 2025: 75.0°F (+12.4°F above summer normal)
Normal average, June-August, 1901-2000: 62.6°F
Total population: 27,492
County seat: Newport

8. Merrimack County, NH

Photo by Dylan Crawford on Unsplash

Forecast average, July 16-18, 2025: 78.0°F (+12.4°F above summer normal)
Normal average, June-August, 1901-2000: 65.6°F
Total population: 155,018
County seat: Concord

7. Chittenden County, VT

Photo by Alexe Rice on Unsplash

Forecast average, July 16-18, 2025: 77.8°F (+12.4°F above summer normal)
Normal average, June-August, 1901-2000: 65.3°F
Total population: 168,831
County seat: Burlington

6. Franklin County, VT

Photo by Oscar Lopez on Pexels

Forecast average, July 16-18, 2025: 77.5°F (+12.5°F above summer normal)
Normal average, June-August, 1901-2000: 65.0°F
Total population: 50,379
County seat: St. Albans

5. Carroll County, NH

Photo by Mick Haupt on Unsplash

Forecast average, July 16-18, 2025: 76.5°F (+12.6°F above summer normal)
Normal average, June-August, 1901-2000: 64.0°F
Total population: 51,259
County seat: Ossipee

4. Lamoille County, VT

Photo by Abigail Ducote on Unsplash

Forecast average, July 16-18, 2025: 75.4°F (+12.8°F above summer normal)
Normal average, June-August, 1901-2000: 62.6°F
Total population: 26,036
County seat: Hyde Park

3. Windsor County, VT

Photo by Joe Cox on Unsplash

Forecast average, July 16-18, 2025: 76.4°F (+12.9°F above summer normal)
Normal average, June-August, 1901-2000: 63.6°F
Total population: 57,968
County seat: Woodstock

2. Washington County, VT

Photo by John Holm on Unsplash

Forecast average, July 16-18, 2025: 75.8°F (+13.0°F above summer normal)
Normal average, June-August, 1901-2000: 62.8°F
Total population: 59,958
County seat: Montpelier

1. Sullivan County, NH

Photo by Suraj Gattani on Unsplash

Forecast average, July 16-18, 2025: 76.9°F (+13.0°F above summer normal)
Normal average, June-August, 1901-2000: 63.9°F
Total population: 43,529
County seat: Newport

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