Boulder Basin

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 66°F. The coldest are in March, when 1 night in 10 drops to 31°F. Frost is common in January, February, March and December.

1. Jan39°F 31°FBag comfortable to 30°F · frost 15% · rain or snow 22% of days
2. Feb39°F 27°FBag comfortable to 25°F · frost 21% · rain or snow 24% of days
3. Mar39°F 31°FBag comfortable to 30°F · frost 14% · rain or snow 32% of days
4. Apr45°F 37°FBag comfortable to 35°F · frost 2% · rain or snow 16% of days
5. May48°F 40°FBag comfortable to 40°F · frost 0% · rain or snow 16% of days
6. Jun59°F 49°FBag comfortable to 50°F · frost 0% · rain or snow 3% of days
7. Jul66°F 58°FBag comfortable to 60°F · frost 0% · rain or snow 9% of days
8. Aug66°F 60°FBag comfortable to 60°F · frost 0% · rain or snow 6% of days
9. Sep61°F 51°FBag comfortable to 50°F · frost 0% · rain or snow 10% of days
10. Oct53°F 45°FBag comfortable to 45°F · frost 0% · rain or snow 9% of days
11. Nov (this month)46°F 38°FBag comfortable to 40°F · frost 3% · rain or snow 13% of days
12. Dec42°F 32°FBag comfortable to 30°F · frost 12% · rain or snow 17% 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.