San Dimas, CA Weather & Climate Normals
What a normal year in San Dimas actually looks like
On the 30-year record NOAA keeps for San Dimas, 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 San Dimas's weather actually swings
Average temperatures in San Dimas 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 San Dimas actually gets
Over a typical year, San Dimas sees about 14.47in of precipitation a year across roughly 31 days with measurable rain or snow, with 0in of snow a year.
San Dimas against the rest of the country
Out of 4876 cities scored here, San Dimas comes in at 202; within CA alone it ranks 202 of 429. Population is about 33,226.
Checking the actual forecast
These figures come from POMONA/FAIRPLEX, CA US, the NOAA station 3.0 miles from San Dimas, 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