ONTARIO INTL AP, CA US
GHCN ID: USW00003102 · CA, US · 289.3 m elevation · Records 1998-2026 (28 years)
Primary station for Fontana, CA.
Monthly climate normals (1991-2020)
| Month | High | Low | Mean | Precip | Snow |
|---|---|---|---|---|---|
| January | 67.7°F | 44.6°F | 56.1°F | 2.57 in | — |
| February | 68.1°F | 46.2°F | 57.1°F | 3.07 in | — |
| March | 71.7°F | 48.7°F | 60.2°F | 1.64 in | — |
| April | 75.7°F | 51.1°F | 63.4°F | 0.76 in | — |
| May | 79.8°F | 55.6°F | 67.7°F | 0.30 in | — |
| June | 86.4°F | 60.0°F | 73.2°F | 0.02 in | — |
| July | 93.8°F | 64.7°F | 79.2°F | 0.05 in | — |
| August | 94.9°F | 65.2°F | 80.1°F | 0.03 in | — |
| September | 91.3°F | 63.8°F | 77.6°F | 0.10 in | — |
| October | 82.6°F | 57.1°F | 69.8°F | 0.41 in | — |
| November | 74.7°F | 49.0°F | 61.9°F | 0.80 in | — |
| December | 66.9°F | 43.6°F | 55.2°F | 1.89 in | — |