Fall River Mills, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 34.9 °F (low) to 66 °F (high). Annual precipitation averages 19.1 Inches. Fall River Mills is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.5 °F | 46.0 °F | 2.69 in. |
| February | 26.2 °F | 50.1 °F | 2.84 in. |
| March | 29.5 °F | 55.5 °F | 2.48 in. |
| April | 32.9 °F | 61.5 °F | 1.83 in. |
| May | 39.2 °F | 70.8 °F | 1.49 in. |
| June | 44.9 °F | 80.3 °F | 0.76 in. |
| July | 49.5 °F | 89.5 °F | 0.11 in. |
| August | 46.8 °F | 88.5 °F | 0.18 in. |
| September | 40.9 °F | 82.5 °F | 0.34 in. |
| October | 33.0 °F | 69.5 °F | 1.14 in. |
| November | 27.5 °F | 53.7 °F | 2.12 in. |
| December | 23.9 °F | 44.4 °F | 3.1 in. |
| Annual | 34.9 °F | 66 °F | 19.08 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |