Coloma, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.4 °C (low) to 23.2 °C (high). Annual precipitation averages 796.3 Millimeters. Coloma is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 13.1 °C | 144.02 mm |
| February | 4.7 °C | 15.3 °C | 139.19 mm |
| March | 6.3 °C | 17.8 °C | 118.87 mm |
| April | 7.5 °C | 20.6 °C | 68.83 mm |
| May | 10.4 °C | 25.6 °C | 39.88 mm |
| June | 13.8 °C | 30.6 °C | 9.14 mm |
| July | 16.2 °C | 34.6 °C | 0.25 mm |
| August | 15.8 °C | 33.9 °C | 1.02 mm |
| September | 14 °C | 31 °C | 5.84 mm |
| October | 10.3 °C | 25.1 °C | 39.37 mm |
| November | 6.1 °C | 17.7 °C | 81.53 mm |
| December | 3.4 °C | 13.1 °C | 148.34 mm |
| Annual | 9.4 °C | 23.2 °C | 796.28 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |