Richvale, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49.4 °F (low) to 74.6 °F (high). Annual precipitation averages 25.9 Inches. Richvale is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.8 °F | 55.7 °F | 5.0 in. |
| February | 41.3 °F | 60.9 °F | 4.61 in. |
| March | 43.7 °F | 66.1 °F | 3.76 in. |
| April | 46.6 °F | 71.9 °F | 1.82 in. |
| May | 53.2 °F | 80.4 °F | 1.17 in. |
| June | 59.0 °F | 88.1 °F | 0.36 in. |
| July | 62.1 °F | 93.7 °F | 0.02 in. |
| August | 60.4 °F | 92.4 °F | 0.06 in. |
| September | 56.7 °F | 88.2 °F | 0.23 in. |
| October | 50.0 °F | 78.3 °F | 1.26 in. |
| November | 42.5 °F | 64.5 °F | 2.58 in. |
| December | 38.4 °F | 55.5 °F | 5.03 in. |
| Annual | 49.4 °F | 74.6 °F | 25.9 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |