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> Usa > San Francisco, California > Precipitation
Rainfall/ Precipitation in San Francisco, California, Usa
- San Francisco, California receives 500.4 mm (19.7 in) of rainfall per year, or 41.7 mm (1.6 in) per month.
- On average there are 62 days per year with more than 0.1 mm (0.004 in) of rainfall (precipitation) or 5.2 days with a quantity of rain, sleet, snow etc. per month.
- The driest weather is in July when an average of 0.8 mm (0 in) of rainfall (precipitation) occurs.
- The wettest weather is in January when an average of 110.5 mm (4.4 in) of rainfall (precipitation) occurs.
Precipitation Table
| Climate Variable | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Average Precipitation mm (in) | 110.5 (4.35) | 80.5 (3.2) | 77.7 (3.1) | 34.8 (1.4) | 4.8 (0.2) | 2.8 (0.1) | 0.8 (0) | 1.3 (0.1) | 5.1 (0.2) | 31 (1.2) | 72.6 (2.9) | 78.5 (3.1) | 500.4 (19.7) | |
 | Precipitation Litres/m² (Gallons/ft²) | 110.5 (2.71) | 80.5 (1.97) | 77.7 (1.91) | 34.8 (0.85) | 4.8 (0.12) | 2.8 (0.07) | 0.8 (0.02) | 1.3 (0.03) | 5.1 (0.13) | 31 (0.76) | 72.6 (1.78) | 78.5 (1.93) | 500.4 (12.27) | |
 | Number of Wet Days (probability of rain on a day) | 11 (35%) | 10 (35%) | 9 (29%) | 6 (20%) | 3 (10%) | 1 (3%) | 0.5 (2%) | 0.5 (2%) | 1 (3%) | 4 (13%) | 7 (23%) | 10 (32%) | 63 (17%) | |
 | Percentage of Sunny (Cloudy) Daylight Hours | 51 (49) | 58 (42) | 72 (28) | 74 (26) | 75 (25) | 76 (24) | 66 (34) | 66 (34) | 73 (27) | 71 (29) | 64 (36) | 61 (39) | 69 (31) |