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Monthly average precipitation data (1986–01 to 2015–12) (NCEI, 2018) in San Francisco, California.
| Month | Precipitation (mm) |
|---|---|
| January | 103.3 |
| February | 110.4 |
| March | 75.2 |
| April | 36.4 |
| May | 18.2 |
| June | 5.5 |
| July | 0.3 |
| August | 1.5 |
| September | 4.5 |
| October | 24.0 |
| November | 64.5 |
| December | 120.7 |
