| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F 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: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 94931 - Cotati, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 41 | 43 | 44 | 47 | 51 | 52 | 52 | 51 | 47 | 42 | 38 | 46 |
| Avg Max Temp (°F) | 57 | 62 | 65 | 69 | 74 | 79 | 83 | 83 | 82 | 76 | 65 | 58 | 71 |
| Avg Precip (In.) | 6.25 | 5.98 | 4.43 | 1.55 | .73 | .16 | .05 | .1 | .38 | 1.56 | 4.27 | 4.59 | 30.05 |