| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95689 - Volcano, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 34 | 36 | 39 | 45 | 51 | 57 | 56 | 53 | 46 | 37 | 33 | 43 |
| Avg Max Temp (°F) | 52 | 57 | 60 | 66 | 74 | 84 | 91 | 90 | 85 | 75 | 60 | 51 | 70 |
| Avg Precip (In.) | 8.45 | 7.37 | 6.77 | 3.58 | 2.01 | .59 | .16 | .15 | .73 | 2.36 | 5.25 | 6.39 | 43.82 |