| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 95223 - Arnold, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 30 | 31 | 32 | 36 | 42 | 48 | 54 | 53 | 49 | 42 | 34 | 30 | 40 |
| Avg Max Temp (°F) | 48 | 51 | 53 | 60 | 69 | 78 | 86 | 85 | 79 | 68 | 54 | 48 | 65 |
| Avg Precip (In.) | 9.72 | 9.09 | 8.23 | 3.9 | 2.08 | .68 | .27 | .23 | 1.04 | 2.92 | 6.13 | 7.09 | 51.37 |