Hardwick, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 49.5 °F (low) to 76.8 °F (high). Annual precipitation averages 8.7 Inches. Hardwick is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.6 °F | 56.0 °F | 1.82 in. |
| February | 40.3 °F | 62.1 °F | 1.54 in. |
| March | 43.6 °F | 68.4 °F | 1.52 in. |
| April | 46.8 °F | 74.5 °F | 0.75 in. |
| May | 53.5 °F | 82.9 °F | 0.4 in. |
| June | 59.0 °F | 91.0 °F | 0.09 in. |
| July | 64.2 °F | 96.8 °F | 0.01 in. |
| August | 62.9 °F | 96.0 °F | 0.0 in. |
| September | 58.2 °F | 91.0 °F | 0.08 in. |
| October | 50.3 °F | 80.3 °F | 0.36 in. |
| November | 41.2 °F | 66.6 °F | 0.72 in. |
| December | 36.1 °F | 56.3 °F | 1.44 in. |
| Annual | 49.5 °F | 76.8 °F | 8.73 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |