San Andreas, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.7 °C (low) to 23.6 °C (high). Annual precipitation averages 740.7 Millimeters. San Andreas is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.1 °C | 13.5 °C | 152.91 mm |
| February | 3.9 °C | 15.7 °C | 123.44 mm |
| March | 5.4 °C | 18.2 °C | 114.55 mm |
| April | 6.7 °C | 20.4 °C | 60.96 mm |
| May | 9.6 °C | 25.7 °C | 34.54 mm |
| June | 12.7 °C | 31.2 °C | 8.64 mm |
| July | 15.4 °C | 34.9 °C | 1.27 mm |
| August | 15.8 °C | 34.4 °C | 2.54 mm |
| September | 14.1 °C | 31.5 °C | 4.06 mm |
| October | 9.7 °C | 25.9 °C | 34.54 mm |
| November | 5.6 °C | 18.4 °C | 67.82 mm |
| December | 2.9 °C | 13.4 °C | 135.38 mm |
| Annual | 8.7 °C | 23.6 °C | 740.65 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |