| 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 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Apr. 11 - Apr. 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 95451 - Kelseyville, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 37 | 39 | 41 | 45 | 51 | 57 | 56 | 52 | 46 | 39 | 34 | 44 |
| Avg Max Temp (°F) | 54 | 57 | 61 | 67 | 75 | 83 | 91 | 91 | 86 | 75 | 60 | 54 | 71 |
| Avg Precip (In.) | 7.43 | 6.59 | 5.32 | 2 | .95 | .21 | .05 | .1 | .52 | 1.71 | 4.74 | 5.47 | 35.09 |