Hat Creek, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 1.3 °C (low) to 18.8 °C (high). Annual precipitation averages 621.3 Millimeters. Hat Creek is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 7.7 °C | 97.03 mm |
| February | -3.7 °C | 9.9 °C | 90.68 mm |
| March | -1.8 °C | 13.1 °C | 78.99 mm |
| April | 0.1 °C | 16.3 °C | 56.9 mm |
| May | 3.7 °C | 21.5 °C | 49.28 mm |
| June | 6.9 °C | 26.8 °C | 19.81 mm |
| July | 9.7 °C | 31.9 °C | 4.32 mm |
| August | 7.8 °C | 31.4 °C | 4.83 mm |
| September | 4.7 °C | 27.9 °C | 11.18 mm |
| October | 0.2 °C | 20.6 °C | 36.83 mm |
| November | -2.7 °C | 11.9 °C | 68.33 mm |
| December | -4.9 °C | 6.8 °C | 103.12 mm |
| Annual | 1.3 °C | 18.8 °C | 621.3 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |