Clarksburg, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48.3 °F (low) to 73.1 °F (high). Annual precipitation averages 19.6 Inches. 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 | 38.9 °F | 55.3 °F | 3.97 in. |
| February | 41.1 °F | 60.5 °F | 4.0 in. |
| March | 44.1 °F | 65.5 °F | 2.82 in. |
| April | 46.6 °F | 70.4 °F | 1.4 in. |
| May | 51.6 °F | 77.9 °F | 0.72 in. |
| June | 56.0 °F | 84.9 °F | 0.18 in. |
| July | 58.3 °F | 89.2 °F | 0.0 in. |
| August | 57.9 °F | 89.0 °F | 0.03 in. |
| September | 55.6 °F | 86.5 °F | 0.1 in. |
| October | 49.7 °F | 77.5 °F | 0.79 in. |
| November | 42.0 °F | 64.6 °F | 1.87 in. |
| December | 38.1 °F | 55.6 °F | 3.67 in. |
| Annual | 48.3 °F | 73.1 °F | 19.55 in. |
| 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 : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |