Hanford, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 49.5 °F (low) to 76.9 °F (high). Annual precipitation averages 8.7 Inches. Hanford is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.4 °F | 56.0 °F | 1.78 in. |
| February | 40.0 °F | 62.0 °F | 1.5 in. |
| March | 43.7 °F | 68.3 °F | 1.54 in. |
| April | 47.0 °F | 74.6 °F | 0.73 in. |
| May | 53.7 °F | 83.2 °F | 0.35 in. |
| June | 59.3 °F | 91.2 °F | 0.1 in. |
| July | 64.6 °F | 97.1 °F | 0.01 in. |
| August | 63.1 °F | 96.3 °F | 0.0 in. |
| September | 58.4 °F | 91.1 °F | 0.08 in. |
| October | 50.2 °F | 80.2 °F | 0.37 in. |
| November | 41.1 °F | 66.5 °F | 0.71 in. |
| December | 35.9 °F | 56.3 °F | 1.48 in. |
| Annual | 49.5 °F | 76.9 °F | 8.65 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |