Richgrove, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 50.7 °F (low) to 77.2 °F (high). Annual precipitation averages 9.1 Inches. Richgrove 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. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 57.6 °F | 1.8 in. |
| February | 41.0 °F | 63.2 °F | 1.72 in. |
| March | 44.6 °F | 69.2 °F | 1.46 in. |
| April | 47.5 °F | 74.6 °F | 0.86 in. |
| May | 54.0 °F | 83.0 °F | 0.34 in. |
| June | 60.1 °F | 91.3 °F | 0.09 in. |
| July | 66.0 °F | 96.7 °F | 0.01 in. |
| August | 64.8 °F | 95.8 °F | 0.01 in. |
| September | 60.3 °F | 90.7 °F | 0.09 in. |
| October | 51.7 °F | 80.0 °F | 0.45 in. |
| November | 42.7 °F | 66.8 °F | 0.84 in. |
| December | 37.1 °F | 57.7 °F | 1.41 in. |
| Annual | 50.7 °F | 77.2 °F | 9.08 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 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 | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |