French Gulch, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 45.5 °F (low) to 72.1 °F (high). Annual precipitation averages 43.5 Inches. French Gulch 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 | 35.4 °F | 51.4 °F | 6.9 in. |
| February | 36.5 °F | 56.2 °F | 7.37 in. |
| March | 38.5 °F | 61.6 °F | 6.71 in. |
| April | 41.6 °F | 67.7 °F | 3.67 in. |
| May | 48.4 °F | 77.1 °F | 2.28 in. |
| June | 54.0 °F | 86.4 °F | 1.1 in. |
| July | 59.7 °F | 95.7 °F | 0.15 in. |
| August | 57.9 °F | 94.7 °F | 0.12 in. |
| September | 53.0 °F | 89.2 °F | 0.48 in. |
| October | 45.6 °F | 75.4 °F | 2.1 in. |
| November | 39.9 °F | 59.1 °F | 4.65 in. |
| December | 35.3 °F | 50.1 °F | 7.92 in. |
| Annual | 45.5 °F | 72.1 °F | 43.45 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Csa - Hot-Summer Mediterranean Climate |