Climate averages 1991–2020
Fontana weather
in March.
A mild, moderately wet month: the 9th warmest and the 10th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
March is a mild month in Fontana: daytime highs average 19.3°C and nights cool to about 6.9°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 68 mm of rain on roughly 7 days, which makes March a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 57 min on an average March day.
The nearest other city in this atlas is San Bernardino (13 km away). In March its highs average 19.5°C, about as warm as Fontana, with 56 mm of rain.
Among the 498 cities listed in the United States, Fontana ranks joint 144th of 498 for the warmest March highs and joint 210th of 498 for the driest March (rainfall, lowest first). The mean March high of those 498 cities is 14.9°C; Fontana is 4.3°C warmer than that mean.
From March to April, average highs rise by 2.6°C to 21.9°C, and monthly rainfall falls from 68 mm to 32 mm.
The annual picture
March in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Fontana climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.7°C4.3°C | 4.3°C | 96 | 6.6 | 10.210 h |
| February | 17.1°C5.2°C | 5.2°C | 111 | 7.4 | 10.911 h |
| March, selected | 19.3°C6.9°C | 6.9°C | 68 | 6.8 | 12.012 h |
| April | 21.9°C8.8°C | 8.8°C | 32 | 4.6 | 13.013 h |
| May | 24.8°C11.7°C | 11.7°C | 15 | 2.6 | 13.914 h |
| June | 29.0°C15.0°C | 15.0°C | 3.4 | 0.5 | 14.414 h |
| July | 32.4°C18.7°C | 18.7°C | 2.2 | 0.5 | 14.214 h |
| August | 33.5°C19.3°C | 19.3°C | 1.1 | 0.3 | 13.413 h |
| September | 31.6°C17.0°C | 17.0°C | 5.5 | 1.2 | 12.412 h |
| October | 26.3°C12.2°C | 12.2°C | 22 | 3.1 | 11.411 h |
| November | 20.9°C7.5°C | 7.5°C | 30 | 3.5 | 10.410 h |
| December | 16.3°C4.1°C | 4.1°C | 67 | 5.8 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
March in nearby cities
- San Bernardino in MarchUnited States · 13 kmHigh 19.5°C · Low 7.1°C · 56 mm rain
- Rancho Cucamonga in MarchUnited States · 15 kmHigh 19.5°C · Low 7.7°C · 68 mm rain
- Riverside in MarchUnited States · 16 kmHigh 19.8°C · Low 7.5°C · 68 mm rain
- Ontario in MarchUnited States · 20 kmHigh 19.7°C · Low 8.2°C · 62 mm rain
- Redlands in MarchUnited States · 24 kmHigh 19.5°C · Low 7.2°C · 56 mm rain
- Chino in MarchUnited States · 25 kmHigh 19.5°C · Low 8.0°C · 62 mm rain
- Moreno Valley in MarchUnited States · 26 kmHigh 18.7°C · Low 6.8°C · 56 mm rain
- Corona in MarchUnited States · 27 kmHigh 20.3°C · Low 8.5°C · 68 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Fontana) is explained once on the Fontana year overview and on the Sources, method and limits page.
Riverside, Rancho Cucamonga and Corona lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.