Deming, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.7 °C (low) to 15.1 °C (high). Annual precipitation averages 1449.8 Millimeters. Deming is located in USDA Plant Hardiness Zone 8a. 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 | 0.4 °C | 6.6 °C | 186.44 mm |
| February | 1 °C | 8.4 °C | 114.3 mm |
| March | 2.4 °C | 11.1 °C | 153.16 mm |
| April | 4.6 °C | 14.4 °C | 111 mm |
| May | 7.5 °C | 18.3 °C | 92.96 mm |
| June | 10.2 °C | 20.7 °C | 70.87 mm |
| July | 11.8 °C | 24 °C | 42.42 mm |
| August | 11.7 °C | 24.6 °C | 37.08 mm |
| September | 9.2 °C | 21.3 °C | 83.06 mm |
| October | 6 °C | 15.3 °C | 156.97 mm |
| November | 2.9 °C | 9.6 °C | 218.95 mm |
| December | 0.5 °C | 6.3 °C | 182.63 mm |
| Annual | 5.7 °C | 15.1 °C | 1449.84 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |