| 2023 Hardiness Zone: | Zone 10a: 30°F to 35°F Zone 7b: 5°F to 10°F Zone 8a: 10°F to 15°F Zone 8b: 15°F to 20°F Zone 9b: 25°F to 30°F Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 10a: 30°F to 35°F Zone 7b: 5°F to 10°F Zone 8a: 10°F to 15°F Zone 8b: 15°F to 20°F Zone 9b: 25°F to 30°F Zone 9a: 20°F to 25°F | |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F | |
| Average First Frost Date: | Nov. 21 - Nov. 30 | |
| Average Last Frost Date: | Mar. 11 - Mar. 20 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 93257 - Porterville, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 42 | 45 | 49 | 55 | 61 | 65 | 64 | 60 | 51 | 42 | 37 | 51 |
| Avg Max Temp (°F) | 57 | 64 | 69 | 77 | 85 | 93 | 98 | 96 | 91 | 82 | 67 | 58 | 78 |
| Avg Precip (In.) | 2.18 | 1.99 | 2.29 | .84 | .41 | .11 | .02 | .02 | .32 | .64 | 1.14 | 1.42 | 11.38 |