Fontana, CA Weather & Climate Normals
What a normal year in Fontana actually looks like
On the 30-year record NOAA keeps for Fontana, CA, the comfort score comes out to 75/100, 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 Fontana's weather actually swings
Average temperatures in Fontana run from 55°F in Dec up to 80°F in Aug, a 24.8°F seasonal swing, a middling gap by national standards.
Fontana, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 68°F | 45°F | 2.57in |
| Feb | 68°F | 46°F | 3.07in |
| Mar | 72°F | 49°F | 1.64in |
| Apr | 76°F | 51°F | 0.76in |
| May | 80°F | 56°F | 0.3in |
| Jun | 86°F | 60°F | 0.02in |
| Jul | 94°F | 65°F | 0.05in |
| Aug | 95°F | 65°F | 0.03in |
| Sep | 91°F | 64°F | 0.1in |
| Oct | 83°F | 57°F | 0.41in |
| Nov | 75°F | 49°F | 0.8in |
| Dec | 67°F | 44°F | 1.89in |
If you're timing a visit, most of the year (9 of 12 months) are Fontana's mildest stretch; if you're moving there, you should plan around Aug's heat instead.
How wet Fontana actually gets
Fontana averages 11.64in of precipitation a year across roughly 36 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Fontana against the rest of the country
Out of 4876 cities scored here, Fontana comes in at 212; within CA alone it ranks 212 of 429. Population is about 218,455.
Checking the actual forecast
These figures come from Ontario Intl Ap, CA US, the NOAA station 8.7 miles from Fontana, 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