East Porterville, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 10.1 °C (low) to 25.5 °C (high). Annual precipitation averages 293.6 Millimeters. 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 | 3.5 °C | 14.3 °C | 58.17 mm |
| February | 4.8 °C | 17.3 °C | 48.51 mm |
| March | 6.7 °C | 20.6 °C | 50.29 mm |
| April | 8.4 °C | 24 °C | 29.21 mm |
| May | 12 °C | 28.9 °C | 11.68 mm |
| June | 15.3 °C | 33.7 °C | 3.3 mm |
| July | 18.6 °C | 36.6 °C | 1.52 mm |
| August | 17.8 °C | 36.2 °C | 1.78 mm |
| September | 15.3 °C | 33.5 °C | 2.03 mm |
| October | 10.7 °C | 27.2 °C | 13.21 mm |
| November | 5.8 °C | 19.5 °C | 24.89 mm |
| December | 2.8 °C | 14.3 °C | 49.02 mm |
| Annual | 10.1 °C | 25.5 °C | 293.61 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |