| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 95444 - Graton, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 40 | 42 | 43 | 46 | 49 | 50 | 50 | 49 | 45 | 40 | 36 | 44 |
| Avg Max Temp (°F) | 57 | 61 | 64 | 69 | 74 | 79 | 82 | 83 | 81 | 76 | 65 | 58 | 71 |
| Avg Precip (In.) | 8.91 | 7.89 | 6.33 | 2.36 | 1.07 | .25 | .08 | .11 | .52 | 2.14 | 6.02 | 6.4 | 42.07 |