| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 96101 - Alturas, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 26 | 29 | 35 | 41 | 45 | 43 | 37 | 29 | 24 | 18 | 31 |
| Avg Max Temp (°F) | 43 | 47 | 52 | 58 | 68 | 77 | 87 | 87 | 79 | 66 | 51 | 43 | 63 |
| Avg Precip (In.) | 1.38 | 1.32 | 1.55 | 1.14 | 1.33 | .81 | .31 | .39 | .66 | .75 | 1.48 | 1.28 | 12.38 |