El Portal, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.7 °C (low) to 22.6 °C (high). Annual precipitation averages 880.9 Millimeters. El Portal is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 12.7 °C | 178.05 mm |
| February | 2.9 °C | 14.2 °C | 157.73 mm |
| March | 4.5 °C | 17 °C | 136.4 mm |
| April | 6.4 °C | 19.4 °C | 72.64 mm |
| May | 9.8 °C | 24.5 °C | 41.91 mm |
| June | 13.7 °C | 30 °C | 12.7 mm |
| July | 17.3 °C | 34.4 °C | 2.29 mm |
| August | 16.8 °C | 34.3 °C | 3.3 mm |
| September | 14.1 °C | 30.9 °C | 7.11 mm |
| October | 9.7 °C | 24.6 °C | 42.67 mm |
| November | 4.9 °C | 17.5 °C | 76.2 mm |
| December | 1.7 °C | 12.1 °C | 149.86 mm |
| Annual | 8.7 °C | 22.6 °C | 880.86 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |