Calistoga, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46 °F (low) to 74.1 °F (high). Annual precipitation averages 38.6 Inches. Calistoga is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.5 °F | 58.6 °F | 7.92 in. |
| February | 39.3 °F | 61.3 °F | 8.37 in. |
| March | 41.4 °F | 64.7 °F | 5.07 in. |
| April | 44.3 °F | 70.7 °F | 2.48 in. |
| May | 48.1 °F | 77.1 °F | 1.27 in. |
| June | 51.7 °F | 85.6 °F | 0.3 in. |
| July | 54.0 °F | 90.4 °F | 0.0 in. |
| August | 53.5 °F | 90.0 °F | 0.06 in. |
| September | 52.2 °F | 87.9 °F | 0.13 in. |
| October | 48.4 °F | 79.4 °F | 1.82 in. |
| November | 41.9 °F | 65.7 °F | 3.58 in. |
| December | 38.1 °F | 58.0 °F | 7.58 in. |
| Annual | 46 °F | 74.1 °F | 38.58 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |