Three Rocks, California has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 10.5 °C (low) to 24.7 °C (high). Annual precipitation averages 178.3 Millimeters. Three Rocks is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 13.3 °C | 39.88 mm |
| February | 5.3 °C | 16.5 °C | 34.54 mm |
| March | 7 °C | 20 °C | 28.7 mm |
| April | 8.7 °C | 23.6 °C | 13.21 mm |
| May | 12.4 °C | 28.1 °C | 8.13 mm |
| June | 15.3 °C | 32.8 °C | 3.81 mm |
| July | 18.4 °C | 36.2 °C | 0 mm |
| August | 17.8 °C | 35.1 °C | 0 mm |
| September | 15.7 °C | 32.2 °C | 1.27 mm |
| October | 11.6 °C | 26.5 °C | 7.62 mm |
| November | 6.6 °C | 18.9 °C | 13.46 mm |
| December | 3.3 °C | 13.6 °C | 27.69 mm |
| Annual | 10.5 °C | 24.7 °C | 178.31 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |