Danville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 48.2 °F (low) to 71.5 °F (high). Annual precipitation averages 24.5 Inches. Danville is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.2 °F | 57.1 °F | 4.65 in. |
| February | 41.8 °F | 61.0 °F | 4.78 in. |
| March | 43.7 °F | 64.8 °F | 3.56 in. |
| April | 46.0 °F | 68.8 °F | 1.76 in. |
| May | 50.0 °F | 73.6 °F | 0.88 in. |
| June | 53.3 °F | 80.8 °F | 0.16 in. |
| July | 56.1 °F | 85.4 °F | 0.02 in. |
| August | 56.4 °F | 85.2 °F | 0.04 in. |
| September | 55.2 °F | 83.8 °F | 0.1 in. |
| October | 50.9 °F | 75.1 °F | 1.11 in. |
| November | 44.2 °F | 65.1 °F | 2.39 in. |
| December | 40.1 °F | 57.3 °F | 5.03 in. |
| Annual | 48.2 °F | 71.5 °F | 24.48 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |