Calpella, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7 °C (low) to 23.1 °C (high). Annual precipitation averages 926.3 Millimeters. 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 | 2.8 °C | 14 °C | 183.13 mm |
| February | 3.3 °C | 15.7 °C | 150.88 mm |
| March | 4.4 °C | 18.2 °C | 131.83 mm |
| April | 5.6 °C | 20.3 °C | 66.29 mm |
| May | 8 °C | 24.7 °C | 33.53 mm |
| June | 10.6 °C | 29 °C | 11.68 mm |
| July | 12.7 °C | 33.8 °C | 1.02 mm |
| August | 12 °C | 33.6 °C | 3.56 mm |
| September | 10.2 °C | 31.5 °C | 4.06 mm |
| October | 7.2 °C | 25.4 °C | 43.94 mm |
| November | 4.4 °C | 17.8 °C | 99.06 mm |
| December | 2.3 °C | 13.6 °C | 197.36 mm |
| Annual | 7 °C | 23.1 °C | 926.34 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |