Wilsonia, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 37.8 °F (low) to 58.6 °F (high). Annual precipitation averages 42.7 Inches. Wilsonia is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.6 °F | 45.8 °F | 8.33 in. |
| February | 25.3 °F | 45.0 °F | 7.28 in. |
| March | 29.0 °F | 47.9 °F | 7.29 in. |
| April | 29.7 °F | 51.2 °F | 4.19 in. |
| May | 37.0 °F | 59.3 °F | 2.0 in. |
| June | 45.7 °F | 69.8 °F | 0.6 in. |
| July | 54.4 °F | 77.3 °F | 0.32 in. |
| August | 54.0 °F | 77.1 °F | 0.11 in. |
| September | 49.1 °F | 71.8 °F | 0.3 in. |
| October | 41.4 °F | 62.0 °F | 2.21 in. |
| November | 33.5 °F | 51.3 °F | 3.3 in. |
| December | 27.9 °F | 45.0 °F | 6.8 in. |
| Annual | 37.8 °F | 58.6 °F | 42.73 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |