Fontana, California, United States climate
Average temperatures, precipitation and all-time records for Fontana, California, United States, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is August, averaging a high of 94°F, and its coldest is December, with an average low of 41°F.
Fontana is a city in San Bernardino County, California, United States. Founded by Azariel Blanchard Miller in 1913, it remained essentially rural until World War II, when entrepreneur Henry J. Kaiser built a large steel mill in the area. via Wikipedia
How today compares
Latest recorded day: 2026-07-21. Each reading placed on Fontana, California, United States's own ±7-day seasonal distribution.
Fontana average temperatures by month
Typical daily high and low, and average precipitation, for each month in Fontana, California, United States, based on 1981–2026 records. The wettest month is January (0.10 in on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 64°F | 41°F | 0.10 in |
| February | 65°F | 42°F | 0.10 in |
| March | 70°F | 44°F | 0.10 in |
| April | 74°F | 47°F | 0.00 in |
| May | 80°F | 51°F | 0.00 in |
| June | 87°F | 57°F | 0.00 in |
| July | 93°F | 64°F | 0.00 in |
| August | 94°F | 65°F | 0.00 in |
| September | 90°F | 62°F | 0.00 in |
| October | 83°F | 56°F | 0.00 in |
| November | 71°F | 47°F | 0.00 in |
| December | 63°F | 41°F | 0.10 in |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 114°F on 2020-09-06
- Coldest day on record: 21°F on 1990-12-23
Percentiles compare each day to Fontana, California, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →