San Diego, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 56.2 °F (low) to 70.4 °F (high). Annual precipitation averages 9.9 Inches. San Diego is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 48.4 °F | 66.0 °F | 1.9 in. |
| February | 49.3 °F | 65.5 °F | 2.39 in. |
| March | 51.6 °F | 66.0 °F | 1.62 in. |
| April | 53.9 °F | 68.1 °F | 0.72 in. |
| May | 57.8 °F | 69.2 °F | 0.21 in. |
| June | 60.8 °F | 71.0 °F | 0.04 in. |
| July | 64.1 °F | 74.5 °F | 0.06 in. |
| August | 65.3 °F | 76.7 °F | 0.02 in. |
| September | 63.8 °F | 76.8 °F | 0.11 in. |
| October | 58.8 °F | 74.3 °F | 0.41 in. |
| November | 52.8 °F | 70.6 °F | 0.81 in. |
| December | 47.7 °F | 65.6 °F | 1.65 in. |
| Annual | 56.2 °F | 70.4 °F | 9.94 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10b : 35°F to 30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |