| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| 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 95932 - Colusa, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 41 | 44 | 47 | 54 | 59 | 61 | 59 | 55 | 49 | 42 | 37 | 49 |
| Avg Max Temp (°F) | 54 | 60 | 65 | 72 | 81 | 89 | 94 | 93 | 88 | 79 | 63 | 54 | 74 |
| Avg Precip (In.) | 3.73 | 3.14 | 2.76 | .82 | .66 | .22 | .04 | .04 | .34 | .98 | 2.2 | 2.44 | 17.37 |