East Porterville, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 50.3 °F (low) to 77.9 °F (high). Annual precipitation averages 11.6 Inches. East Porterville is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.3 °F | 57.7 °F | 2.29 in. |
| February | 40.7 °F | 63.1 °F | 1.91 in. |
| March | 44.1 °F | 69.1 °F | 1.98 in. |
| April | 47.2 °F | 75.2 °F | 1.15 in. |
| May | 53.6 °F | 84.0 °F | 0.46 in. |
| June | 59.6 °F | 92.6 °F | 0.13 in. |
| July | 65.5 °F | 97.9 °F | 0.06 in. |
| August | 64.1 °F | 97.1 °F | 0.07 in. |
| September | 59.6 °F | 92.3 °F | 0.08 in. |
| October | 51.2 °F | 81.0 °F | 0.52 in. |
| November | 42.4 °F | 67.1 °F | 0.98 in. |
| December | 37.1 °F | 57.7 °F | 1.93 in. |
| Annual | 50.3 °F | 77.9 °F | 11.56 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |