Catheys Valley, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.4 °C (low) to 23.8 °C (high). Annual precipitation averages 496.6 Millimeters. 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 | 3.2 °C | 13.7 °C | 97.28 mm |
| February | 4.1 °C | 15.3 °C | 84.84 mm |
| March | 5.7 °C | 17.8 °C | 80.26 mm |
| April | 7.1 °C | 20.9 °C | 41.91 mm |
| May | 10.3 °C | 26.2 °C | 22.86 mm |
| June | 14.1 °C | 31.4 °C | 6.1 mm |
| July | 17.7 °C | 35.4 °C | 1.27 mm |
| August | 17.2 °C | 35 °C | 1.02 mm |
| September | 14.7 °C | 32.1 °C | 2.54 mm |
| October | 10.5 °C | 25.9 °C | 24.38 mm |
| November | 5.9 °C | 18.6 °C | 45.97 mm |
| December | 2.7 °C | 13.7 °C | 88.14 mm |
| Annual | 9.4 °C | 23.8 °C | 496.57 mm |
| 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 : -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 |