Weir and Johnson

Nights by month

Night lows from 2016 to 2025: a typical night, and the cold one that comes 1 night in 10.

The mildest nights are in July, typically 49°F. The coldest are in January, when 1 night in 10 drops to -3°F. Frost is common in January, February, March, April, May, September, October, November and December.

1. Jan9°F -3°FBag comfortable to -5°F · frost 100% · rain or snow 38% of days
2. Feb10°F -3°FBag comfortable to 0°F · frost 99% · rain or snow 42% of days
3. Mar15°F 4°FBag comfortable to 5°F · frost 97% · rain or snow 50% of days
4. Apr22°F 9°FBag comfortable to 10°F · frost 89% · rain or snow 45% of days
5. May30°F 21°FBag comfortable to 20°F · frost 59% · rain or snow 47% of days
6. Jun41°F 33°FBag comfortable to 35°F · frost 8% · rain or snow 37% of days
7. Jul49°F 44°FBag comfortable to 45°F · frost 0% · rain or snow 57% of days
8. Aug48°F 41°FBag comfortable to 40°F · frost 0% · rain or snow 56% of days
9. Sep41°F 32°FBag comfortable to 30°F · frost 13% · rain or snow 42% of days
10. Oct30°F 15°FBag comfortable to 15°F · frost 60% · rain or snow 32% of days
11. Nov (this month)18°F 3°FBag comfortable to 5°F · frost 94% · rain or snow 27% of days
12. Dec11°F -5°FBag comfortable to -5°F · frost 99% · rain or snow 33% of days

| = 32°F

History: ERA5 and ERA5-Land reanalysis via Open-Meteo, corrected to the site's elevation. Bag rating: the comfort rating that keeps you warm in a tent on 9 of 10 nights that month.