Dutch Flat, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.3 °C (low) to 20.1 °C (high). Annual precipitation averages 1465.6 Millimeters. Dutch Flat is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 11 °C | 250.44 mm |
| February | 1.8 °C | 11.8 °C | 241.3 mm |
| March | 2.8 °C | 14.1 °C | 223.01 mm |
| April | 4.4 °C | 17.1 °C | 128.27 mm |
| May | 8.2 °C | 21.7 °C | 75.95 mm |
| June | 11.6 °C | 27.2 °C | 22.1 mm |
| July | 15.2 °C | 31.5 °C | 1.02 mm |
| August | 15.6 °C | 31.3 °C | 2.79 mm |
| September | 12.1 °C | 28.4 °C | 13.97 mm |
| October | 8 °C | 22.3 °C | 73.66 mm |
| November | 4.2 °C | 14.3 °C | 153.92 mm |
| December | 1.5 °C | 10 °C | 279.15 mm |
| Annual | 7.3 °C | 20.1 °C | 1465.58 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |