Copperopolis, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.9 °C (low) to 23.6 °C (high). Annual precipitation averages 662.9 Millimeters. 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 | 2.9 °C | 13.4 °C | 138.18 mm |
| February | 3.8 °C | 15.4 °C | 113.28 mm |
| March | 5.3 °C | 17.9 °C | 98.81 mm |
| April | 6.7 °C | 20.4 °C | 55.37 mm |
| May | 9.9 °C | 25.8 °C | 34.04 mm |
| June | 13.3 °C | 31.3 °C | 8.38 mm |
| July | 16.6 °C | 35.1 °C | 0.76 mm |
| August | 16.2 °C | 34.5 °C | 1.52 mm |
| September | 14.1 °C | 31.6 °C | 3.81 mm |
| October | 9.8 °C | 25.8 °C | 34.29 mm |
| November | 5.4 °C | 18.4 °C | 63.75 mm |
| December | 2.8 °C | 13.6 °C | 110.74 mm |
| Annual | 8.9 °C | 23.6 °C | 662.93 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |