US Geography / US Weather / California Weather / St Helena |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 56 | 62 | 64 | 70 | 78 | 84 | 88 | 88 | 85 | 77 | 64 | 57 |
| Avg. Low | 35 | 38 | 40 | 42 | 46 | 51 | 52 | 52 | 50 | 46 | 40 | 36 |
| Mean | 46 | 50 | 52 | 56 | 64 | 68 | 71 | 71 | 68 | 62 | 54 | 47 |
| Avg. Precip. | 8.0 in | 5.9 in | 4.7 in | 1.9 in | 0.5 in | 0.3 in | 0.1 in | 0.1 in | 0.4 in | 2.1 in | 5.5 in | 5.9 in |
Degrees in Fahrenheit
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