Boulder Creek (ca)

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 56°F. The coldest are in February, when 1 night in 10 drops to 11°F. Frost is common in January, February, March, April, May, October, November and December.

1. Jan23°F 13°FBag comfortable to 15°F · frost 96% · rain or snow 36% of days
2. Feb23°F 11°FBag comfortable to 10°F · frost 92% · rain or snow 36% of days
3. Mar26°F 17°FBag comfortable to 15°F · frost 85% · rain or snow 41% of days
4. Apr32°F 22°FBag comfortable to 20°F · frost 52% · rain or snow 27% of days
5. May40°F 30°FBag comfortable to 30°F · frost 14% · rain or snow 26% of days
6. Jun50°F 39°FBag comfortable to 40°F · frost 1% · rain or snow 9% of days
7. Jul56°F 50°FBag comfortable to 50°F · frost 0% · rain or snow 6% of days
8. Aug56°F 50°FBag comfortable to 50°F · frost 0% · rain or snow 9% of days
9. Sep (this month)49°F 41°FBag comfortable to 40°F · frost 1% · rain or snow 14% of days
10. Oct39°F 29°FBag comfortable to 30°F · frost 16% · rain or snow 14% of days
11. Nov30°F 16°FBag comfortable to 15°F · frost 59% · rain or snow 25% of days
12. Dec23°F 13°FBag comfortable to 15°F · frost 88% · 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.