| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Jan. 21 - Jan. 31 |
| Average Last Frost Date: | Jan. 21 - Jan. 31 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 95562 - Rio Dell, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 41 | 41 | 43 | 46 | 50 | 52 | 52 | 50 | 46 | 42 | 39 | 45 |
| Avg Max Temp (°F) | 56 | 57 | 58 | 61 | 64 | 67 | 71 | 71 | 72 | 67 | 60 | 55 | 63 |
| Avg Precip (In.) | 8.18 | 7.67 | 7.19 | 3.38 | 1.68 | .55 | .11 | .35 | .83 | 2.73 | 6.69 | 7.98 | 47.33 |