Copperopolis, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48 °F (low) to 74.5 °F (high). Annual precipitation averages 26.1 Inches. Copperopolis is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.3 °F | 56.2 °F | 5.44 in. |
| February | 38.8 °F | 59.7 °F | 4.46 in. |
| March | 41.6 °F | 64.2 °F | 3.89 in. |
| April | 44.1 °F | 68.8 °F | 2.18 in. |
| May | 49.9 °F | 78.5 °F | 1.34 in. |
| June | 55.9 °F | 88.3 °F | 0.33 in. |
| July | 61.8 °F | 95.1 °F | 0.03 in. |
| August | 61.2 °F | 94.1 °F | 0.06 in. |
| September | 57.4 °F | 88.8 °F | 0.15 in. |
| October | 49.7 °F | 78.4 °F | 1.35 in. |
| November | 41.8 °F | 65.1 °F | 2.51 in. |
| December | 37.0 °F | 56.4 °F | 4.36 in. |
| Annual | 48 °F | 74.5 °F | 26.1 in. |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |