| 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 9a: 20F to 25F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| 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 95422 - Clearlake, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 39 | 45 | 52 | 56 | 55 | 51 | 44 | 36 | 32 | 43 |
| Avg Max Temp (°F) | 55 | 57 | 61 | 67 | 75 | 84 | 91 | 91 | 85 | 75 | 61 | 55 | 71 |
| Avg Precip (In.) | 6.26 | 5.58 | 4.42 | 1.46 | .91 | .21 | .06 | .08 | .44 | 1.45 | 3.58 | 4.51 | 28.96 |