Rough and Ready, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.4 °C (low) to 21.8 °C (high). Annual precipitation averages 1172.7 Millimeters. Rough and Ready is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.7 °C | 12.9 °C | 206.25 mm |
| February | 3.1 °C | 13.9 °C | 194.82 mm |
| March | 4.3 °C | 16 °C | 186.18 mm |
| April | 5.9 °C | 18.6 °C | 98.3 mm |
| May | 9.3 °C | 23.2 °C | 56.13 mm |
| June | 12.9 °C | 28.4 °C | 14.73 mm |
| July | 16.3 °C | 32.8 °C | 0.51 mm |
| August | 16 °C | 32.7 °C | 2.54 mm |
| September | 13.5 °C | 29.9 °C | 9.65 mm |
| October | 9.4 °C | 24 °C | 55.88 mm |
| November | 5 °C | 16.6 °C | 120.65 mm |
| December | 2.4 °C | 12.3 °C | 227.08 mm |
| Annual | 8.4 °C | 21.8 °C | 1172.72 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |