Cassel, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 35.1 °F (low) to 67.1 °F (high). Annual precipitation averages 20.3 Inches. Cassel is located in USDA Plant Hardiness Zone 7a. 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 | 24.6 °F | 46.8 °F | 2.72 in. |
| February | 26.3 °F | 50.9 °F | 3.05 in. |
| March | 29.6 °F | 56.5 °F | 2.66 in. |
| April | 32.9 °F | 62.6 °F | 1.81 in. |
| May | 39.4 °F | 72.1 °F | 1.58 in. |
| June | 45.0 °F | 81.7 °F | 0.69 in. |
| July | 49.7 °F | 90.9 °F | 0.16 in. |
| August | 46.9 °F | 89.9 °F | 0.17 in. |
| September | 41.1 °F | 83.7 °F | 0.41 in. |
| October | 33.2 °F | 70.4 °F | 1.32 in. |
| November | 28.1 °F | 54.4 °F | 2.39 in. |
| December | 24.3 °F | 45.2 °F | 3.38 in. |
| Annual | 35.1 °F | 67.1 °F | 20.34 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |