Hanford, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9.8 °C (low) to 25 °C (high). Annual precipitation averages 219.7 Millimeters. 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 | 3 °C | 13.3 °C | 45.21 mm |
| February | 4.4 °C | 16.7 °C | 38.1 mm |
| March | 6.5 °C | 20.2 °C | 39.12 mm |
| April | 8.3 °C | 23.7 °C | 18.54 mm |
| May | 12.1 °C | 28.4 °C | 8.89 mm |
| June | 15.2 °C | 32.9 °C | 2.54 mm |
| July | 18.1 °C | 36.2 °C | 0.25 mm |
| August | 17.3 °C | 35.7 °C | 0 mm |
| September | 14.7 °C | 32.8 °C | 2.03 mm |
| October | 10.1 °C | 26.8 °C | 9.4 mm |
| November | 5.1 °C | 19.2 °C | 18.03 mm |
| December | 2.2 °C | 13.5 °C | 37.59 mm |
| Annual | 9.8 °C | 25 °C | 219.7 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |