Clayton, CA Weather & Climate Normals
Clayton's real weather, in one number
Clayton, CA scores 62/100 on this site's reading of NOAA's own 30-year normals: mild with real seasons. A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. 6 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Clayton's hottest and coldest months
Clayton's hottest month is Jul, averaging 72°F; its coldest is Dec, averaging 47°F, a 24.7°F swing across the year, a middling gap by national standards.
Rain and snow in Clayton
Clayton averages 26.05in of precipitation a year across roughly 68 days with measurable rain or snow, and 0.7in of snow a year.
Where Clayton ranks
Clayton ranks 442 of 4876 US cities in this dataset for comfort score, and 290 of 429 within CA. About 10,933 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from MT DIABLO JUNCTION, CA US, 4.2 miles from Clayton, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station