| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 95490 - Willits, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 36 | 37 | 41 | 45 | 49 | 48 | 44 | 39 | 35 | 32 | 40 |
| Avg Max Temp (°F) | 55 | 58 | 60 | 64 | 71 | 78 | 85 | 85 | 82 | 74 | 60 | 55 | 69 |
| Avg Precip (In.) | 9.95 | 8.81 | 7.45 | 3.08 | 1.58 | .31 | .09 | .2 | .85 | 2.75 | 6.87 | 7.83 | 49.79 |