San Francisco, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 10.8 °C (low) to 18.3 °C (high). Annual precipitation averages 592.8 Millimeters. San Francisco is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.6 °C | 14.2 °C | 98.81 mm |
| February | 8.5 °C | 15.6 °C | 115.82 mm |
| March | 9.1 °C | 16.8 °C | 82.55 mm |
| April | 9.8 °C | 17.7 °C | 30.48 mm |
| May | 11.2 °C | 18.6 °C | 17.78 mm |
| June | 12.2 °C | 20.1 °C | 5.08 mm |
| July | 13.1 °C | 20.2 °C | 0.76 mm |
| August | 13.7 °C | 20.9 °C | 1.27 mm |
| September | 13.6 °C | 22.3 °C | 2.03 mm |
| October | 12.6 °C | 21.7 °C | 20.07 mm |
| November | 10.1 °C | 17.6 °C | 67.06 mm |
| December | 7.7 °C | 14.3 °C | 151.13 mm |
| Annual | 10.8 °C | 18.3 °C | 592.84 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |