| 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 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 95988 - Willows, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 40 | 42 | 45 | 52 | 58 | 60 | 59 | 56 | 49 | 41 | 36 | 48 |
| Avg Max Temp (°F) | 55 | 61 | 65 | 73 | 81 | 88 | 93 | 92 | 88 | 79 | 63 | 55 | 74 |
| Avg Precip (In.) | 3.84 | 3.59 | 2.94 | 1 | .79 | .3 | .06 | .09 | .33 | .98 | 2.38 | 2.65 | 18.95 |