Ukiah, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 45.1 °F (low) to 73.5 °F (high). Annual precipitation averages 38.7 Inches. Ukiah 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 Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.5 °F | 57.4 °F | 7.73 in. |
| February | 38.4 °F | 60.3 °F | 6.91 in. |
| March | 40.5 °F | 64.8 °F | 5.42 in. |
| April | 42.6 °F | 68.6 °F | 2.69 in. |
| May | 47.0 °F | 76.1 °F | 1.43 in. |
| June | 51.8 °F | 84.1 °F | 0.37 in. |
| July | 55.3 °F | 92.4 °F | 0.03 in. |
| August | 54.1 °F | 92.1 °F | 0.08 in. |
| September | 50.9 °F | 88.2 °F | 0.13 in. |
| October | 45.6 °F | 77.6 °F | 1.77 in. |
| November | 40.3 °F | 64.0 °F | 4.12 in. |
| December | 36.6 °F | 56.6 °F | 8.03 in. |
| Annual | 45.1 °F | 73.5 °F | 38.71 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |