Fairfax, CA Weather & Climate Normals
What a normal year in Fairfax actually looks like
On the 30-year record NOAA keeps for Fairfax, CA, the comfort score comes out to 79/100, 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 Fairfax's weather actually swings
Average temperatures in Fairfax run from 50°F in Dec up to 68°F in Aug, a 18.8°F seasonal swing, one of the smaller gaps in this dataset.
Fairfax, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 57°F | 43°F | 7.13in | 0in |
| Feb | 61°F | 44°F | 6.94in | 0in |
| Mar | 65°F | 46°F | 4.42in | 0in |
| Apr | 68°F | 48°F | 1.99in | 0in |
| May | 72°F | 51°F | 0.94in | 0in |
| Jun | 78°F | 54°F | 0.15in | 0in |
| Jul | 81°F | 55°F | 0in | 0in |
| Aug | 81°F | 56°F | 0.05in | 0in |
| Sep | 81°F | 54°F | 0.07in | 0in |
| Oct | 75°F | 51°F | 1.46in | 0in |
| Nov | 65°F | 46°F | 3.49in | 0in |
| Dec | 57°F | 42°F | 7.81in | 0in |
If you're timing a visit, most of the year (9 of 12 months) are Fairfax's mildest stretch; if you're moving there, you should plan around Dec's cold instead.
How wet Fairfax actually gets
Over a typical year, Fairfax sees about 34.45in of precipitation a year across roughly 69 days with measurable rain or snow, with 0in of snow a year.
Fairfax against the rest of the country
Out of 4876 cities scored here, Fairfax comes in at 139; within CA alone it ranks 139 of 429. Population is about 7,476.
Checking the actual forecast
These figures come from San Rafael Civic Ctr, CA US, the NOAA station 3.2 miles from Fairfax, 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