San Andreas, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 47.7 °F (low) to 74.5 °F (high). Annual precipitation averages 29.2 Inches. 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 | 37.6 °F | 56.3 °F | 6.02 in. |
| February | 39.1 °F | 60.3 °F | 4.86 in. |
| March | 41.7 °F | 64.8 °F | 4.51 in. |
| April | 44.0 °F | 68.8 °F | 2.4 in. |
| May | 49.2 °F | 78.3 °F | 1.36 in. |
| June | 54.9 °F | 88.1 °F | 0.34 in. |
| July | 59.8 °F | 94.9 °F | 0.05 in. |
| August | 60.5 °F | 94.0 °F | 0.1 in. |
| September | 57.3 °F | 88.7 °F | 0.16 in. |
| October | 49.5 °F | 78.6 °F | 1.36 in. |
| November | 42.0 °F | 65.2 °F | 2.67 in. |
| December | 37.2 °F | 56.2 °F | 5.33 in. |
| Annual | 47.7 °F | 74.5 °F | 29.16 in. |
| 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 : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |