Grass Valley, CA Weather & Climate Normals
Grass Valley's real weather, in one number
Grass Valley, CA scores 58/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 6 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Grass Valley's hottest and coldest months
Grass Valley's hottest month is Jul, averaging 73°F; its coldest is Dec, averaging 43°F, a 30.5°F swing across the year, a middling gap by national standards.
Rain and snow in Grass Valley
Grass Valley averages 53.2in of precipitation a year across roughly 82 days with measurable rain or snow, and 8.6in of snow a year.
Where Grass Valley ranks
Grass Valley ranks 628 of 4876 US cities in this dataset for comfort score, and 332 of 429 within CA. About 14,085 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from GRASS VALLEY #2, CA US, 1.4 miles from Grass Valley, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure