Calpella, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.5 °F (low) to 73.6 °F (high). Annual precipitation averages 36.5 Inches. Calpella is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.1 °F | 57.2 °F | 7.21 in. |
| February | 38.0 °F | 60.3 °F | 5.94 in. |
| March | 40.0 °F | 64.7 °F | 5.19 in. |
| April | 42.1 °F | 68.6 °F | 2.61 in. |
| May | 46.4 °F | 76.4 °F | 1.32 in. |
| June | 51.1 °F | 84.2 °F | 0.46 in. |
| July | 54.8 °F | 92.8 °F | 0.04 in. |
| August | 53.6 °F | 92.5 °F | 0.14 in. |
| September | 50.3 °F | 88.7 °F | 0.16 in. |
| October | 45.0 °F | 77.8 °F | 1.73 in. |
| November | 39.9 °F | 64.0 °F | 3.9 in. |
| December | 36.2 °F | 56.4 °F | 7.77 in. |
| Annual | 44.5 °F | 73.6 °F | 36.47 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 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 | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |