Willows, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49.3 °F (low) to 75.7 °F (high). Annual precipitation averages 19.8 Inches. Willows 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 | 38.7 °F | 56.6 °F | 4.37 in. |
| February | 41.1 °F | 61.8 °F | 3.82 in. |
| March | 43.5 °F | 66.8 °F | 2.63 in. |
| April | 46.1 °F | 73.7 °F | 1.12 in. |
| May | 53.1 °F | 81.7 °F | 1.0 in. |
| June | 59.2 °F | 89.2 °F | 0.29 in. |
| July | 61.9 °F | 94.0 °F | 0.01 in. |
| August | 60.2 °F | 93.1 °F | 0.04 in. |
| September | 56.9 °F | 89.8 °F | 0.09 in. |
| October | 50.4 °F | 80.5 °F | 0.84 in. |
| November | 42.6 °F | 65.4 °F | 1.94 in. |
| December | 38.3 °F | 56.3 °F | 3.69 in. |
| Annual | 49.3 °F | 75.7 °F | 19.84 in. |
| 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 : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |