Richgrove, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 10.4 °C (low) to 25.1 °C (high). Annual precipitation averages 230.6 Millimeters. 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 | 3.7 °C | 14.2 °C | 45.72 mm |
| February | 5 °C | 17.3 °C | 43.69 mm |
| March | 7 °C | 20.7 °C | 37.08 mm |
| April | 8.6 °C | 23.7 °C | 21.84 mm |
| May | 12.2 °C | 28.3 °C | 8.64 mm |
| June | 15.6 °C | 32.9 °C | 2.29 mm |
| July | 18.9 °C | 35.9 °C | 0.25 mm |
| August | 18.2 °C | 35.4 °C | 0.25 mm |
| September | 15.7 °C | 32.6 °C | 2.29 mm |
| October | 10.9 °C | 26.7 °C | 11.43 mm |
| November | 5.9 °C | 19.3 °C | 21.34 mm |
| December | 2.8 °C | 14.3 °C | 35.81 mm |
| Annual | 10.4 °C | 25.1 °C | 230.63 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |