Rough and Ready, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 47.1 °F (low) to 71.2 °F (high). Annual precipitation averages 46.2 Inches. 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 | 36.8 °F | 55.3 °F | 8.12 in. |
| February | 37.6 °F | 57.1 °F | 7.67 in. |
| March | 39.7 °F | 60.8 °F | 7.33 in. |
| April | 42.6 °F | 65.4 °F | 3.87 in. |
| May | 48.8 °F | 73.7 °F | 2.21 in. |
| June | 55.3 °F | 83.1 °F | 0.58 in. |
| July | 61.4 °F | 91.1 °F | 0.02 in. |
| August | 60.8 °F | 90.8 °F | 0.1 in. |
| September | 56.3 °F | 85.9 °F | 0.38 in. |
| October | 48.9 °F | 75.2 °F | 2.2 in. |
| November | 41.0 °F | 61.9 °F | 4.75 in. |
| December | 36.3 °F | 54.1 °F | 8.94 in. |
| Annual | 47.1 °F | 71.2 °F | 46.17 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |