Walnut, CA Weather & Climate Normals
What a normal year in Walnut actually looks like
On the 30-year record NOAA keeps for Walnut, CA, the comfort score comes out to 76/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 9 months a year land in the 55–75°F range this site treats as mild.
How much Walnut's weather actually swings
Average temperatures in Walnut run from 54°F in Dec up to 78°F in Aug, a 23.4°F seasonal swing, a middling gap by national standards.
How wet Walnut actually gets
Over a typical year, Walnut sees about 14.47in of precipitation a year across roughly 31 days with measurable rain or snow, with 0in of snow a year.
Walnut against the rest of the country
Out of 4876 cities scored here, Walnut comes in at 206; within CA alone it ranks 206 of 429. Population is about 27,250.
Checking the actual forecast
These figures come from POMONA/FAIRPLEX, CA US, the NOAA station 6.0 miles from Walnut, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is