| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Mar. 1 - Mar. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95476 - Sonoma, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 40 | 41 | 43 | 47 | 51 | 53 | 53 | 51 | 47 | 41 | 37 | 45 |
| Avg Max Temp (°F) | 57 | 62 | 65 | 70 | 77 | 83 | 88 | 87 | 84 | 78 | 65 | 57 | 73 |
| Avg Precip (In.) | 6.47 | 5.99 | 4.58 | 1.55 | .78 | .18 | .05 | .11 | .33 | 1.62 | 4.17 | 4.48 | 30.31 |