Coulterville, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.1 °C (low) to 23.2 °C (high). Annual precipitation averages 697.2 Millimeters. Coulterville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 13.4 °C | 138.94 mm |
| February | 3.1 °C | 14.7 °C | 120.14 mm |
| March | 4.4 °C | 17.1 °C | 108.46 mm |
| April | 5.8 °C | 20.1 °C | 60.2 mm |
| May | 9 °C | 25.2 °C | 31.75 mm |
| June | 12.6 °C | 30.7 °C | 8.89 mm |
| July | 16.3 °C | 34.9 °C | 1.02 mm |
| August | 15.7 °C | 34.5 °C | 1.27 mm |
| September | 13.2 °C | 31.5 °C | 3.56 mm |
| October | 8.9 °C | 25.3 °C | 35.05 mm |
| November | 4.6 °C | 17.9 °C | 64.77 mm |
| December | 1.8 °C | 13.2 °C | 123.19 mm |
| Annual | 8.1 °C | 23.2 °C | 697.24 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 40-50 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 | Csa - Hot-Summer Mediterranean Climate |