| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 21 - Dec. 31 |
| Average Last Frost Date: | Feb. 1 - Feb. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 95690 - Walnut Grove, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 41 | 43 | 46 | 51 | 55 | 58 | 57 | 55 | 49 | 42 | 37 | 48 |
| Avg Max Temp (°F) | 54 | 61 | 66 | 72 | 80 | 87 | 91 | 91 | 87 | 78 | 64 | 54 | 74 |
| Avg Precip (In.) | 3.5 | 2.75 | 2.39 | 1.49 | .83 | .14 | .04 | .01 | .23 | .82 | 1.47 | 3.24 | 16.91 |