Clarksburg, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.1 °C (low) to 22.8 °C (high). Annual precipitation averages 496.6 Millimeters. Clarksburg 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 Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °C | 12.9 °C | 100.84 mm |
| February | 5.1 °C | 15.8 °C | 101.6 mm |
| March | 6.7 °C | 18.6 °C | 71.63 mm |
| April | 8.1 °C | 21.3 °C | 35.56 mm |
| May | 10.9 °C | 25.5 °C | 18.29 mm |
| June | 13.3 °C | 29.4 °C | 4.57 mm |
| July | 14.6 °C | 31.8 °C | 0 mm |
| August | 14.4 °C | 31.7 °C | 0.76 mm |
| September | 13.1 °C | 30.3 °C | 2.54 mm |
| October | 9.8 °C | 25.3 °C | 20.07 mm |
| November | 5.6 °C | 18.1 °C | 47.5 mm |
| December | 3.4 °C | 13.1 °C | 93.22 mm |
| Annual | 9.1 °C | 22.8 °C | 496.58 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 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 | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |