| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°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 95540 - Fortuna, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 41 | 42 | 44 | 47 | 50 | 52 | 52 | 50 | 46 | 43 | 40 | 46 |
| Avg Max Temp (°F) | 55 | 57 | 58 | 60 | 62 | 65 | 67 | 68 | 68 | 65 | 59 | 55 | 62 |
| Avg Precip (In.) | 8.88 | 5.74 | 5.79 | 3.13 | 1.5 | .54 | .11 | .35 | .84 | 2.23 | 6.27 | 7.36 | 42.75 |