| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F 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: | Dec. 21 - Dec. 31 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| 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 95640 - Ione, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 41 | 43 | 45 | 50 | 56 | 60 | 59 | 57 | 51 | 43 | 37 | 48 |
| Avg Max Temp (°F) | 54 | 60 | 64 | 71 | 80 | 89 | 95 | 94 | 88 | 78 | 63 | 55 | 74 |
| Avg Precip (In.) | 4.01 | 3.75 | 3.75 | 1.71 | .87 | .25 | .11 | .09 | .49 | 1.28 | 2.72 | 2.92 | 21.95 |