Fontana, CA
Climate overview — based on NOAA 1991-2020 normals from ONTARIO INTL AP, CA US.
Year-round temperatures (°F)
Climate summary
Fontana has an annual average temperature of 66.8°F with about 11.6 inches of precipitation per year. The warmest month is August (average high 94.9°F), and the coldest is December (average low 43.6°F). February is typically the wettest month (3.07 in) and June the driest (0.02 in).
Best time to visit Fontana
Full guide →Climate change signal
All-time records →170 of 366 (46.4%) of Fontana's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1990s | 22 | |
| 2000s | 110 | |
| 2010s | 150 | |
| 2020s | 84 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 67.7°F | 44.6°F | 56.1°F | 2.57 in | — | 5 |
| February | 68.1°F | 46.2°F | 57.1°F | 3.07 in | — | 6 |
| March | 71.7°F | 48.7°F | 60.2°F | 1.64 in | — | 5 |
| April | 75.7°F | 51.1°F | 63.4°F | 0.76 in | — | 4 |
| May | 79.8°F | 55.6°F | 67.7°F | 0.30 in | — | 2 |
| June | 86.4°F | 60.0°F | 73.2°F | 0.02 in | — | 0 |
| July | 93.8°F | 64.7°F | 79.2°F | 0.05 in | — | 1 |
| August | 94.9°F | 65.2°F | 80.1°F | 0.03 in | — | 0 |
| September | 91.3°F | 63.8°F | 77.6°F | 0.10 in | — | 1 |
| October | 82.6°F | 57.1°F | 69.8°F | 0.41 in | — | 2 |
| November | 74.7°F | 49.0°F | 61.9°F | 0.80 in | — | 4 |
| December | 66.9°F | 43.6°F | 55.2°F | 1.89 in | — | 6 |
Climate twins of Fontana
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).