Catheys Valley, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48.9 °F (low) to 74.9 °F (high). Annual precipitation averages 19.6 Inches. Catheys Valley is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.7 °F | 56.7 °F | 3.83 in. |
| February | 39.3 °F | 59.5 °F | 3.34 in. |
| March | 42.2 °F | 64.1 °F | 3.16 in. |
| April | 44.7 °F | 69.7 °F | 1.65 in. |
| May | 50.5 °F | 79.2 °F | 0.9 in. |
| June | 57.3 °F | 88.6 °F | 0.24 in. |
| July | 63.8 °F | 95.7 °F | 0.05 in. |
| August | 63.0 °F | 95.0 °F | 0.04 in. |
| September | 58.4 °F | 89.7 °F | 0.1 in. |
| October | 50.9 °F | 78.7 °F | 0.96 in. |
| November | 42.6 °F | 65.4 °F | 1.81 in. |
| December | 36.8 °F | 56.6 °F | 3.47 in. |
| Annual | 48.9 °F | 74.9 °F | 19.55 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |