| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 95462 - Monte Rio, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 42 | 43 | 44 | 46 | 48 | 50 | 50 | 49 | 47 | 43 | 40 | 45 |
| Avg Max Temp (°F) | 57 | 60 | 63 | 68 | 72 | 77 | 80 | 80 | 78 | 74 | 63 | 57 | 69 |
| Avg Precip (In.) | 9.64 | 8.65 | 6.92 | 2.72 | 1.32 | .24 | .08 | .19 | .62 | 2.56 | 6.7 | 6.88 | 46.51 |