Deale, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 18.7 °C (high). Annual precipitation averages 1165.3 Millimeters. Deale is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 6.3 °C | 78.99 mm |
| February | -1.4 °C | 7.6 °C | 69.6 mm |
| March | 2.4 °C | 11.9 °C | 102.36 mm |
| April | 8.1 °C | 18.4 °C | 81.79 mm |
| May | 13.5 °C | 23.3 °C | 108.46 mm |
| June | 18.8 °C | 28.1 °C | 111 mm |
| July | 21.7 °C | 30.6 °C | 116.33 mm |
| August | 20.9 °C | 29.6 °C | 104.9 mm |
| September | 17.5 °C | 26.2 °C | 114.55 mm |
| October | 11.1 °C | 20.1 °C | 103.63 mm |
| November | 5.3 °C | 13.7 °C | 80.77 mm |
| December | 0.8 °C | 8.6 °C | 92.96 mm |
| Annual | 9.7 °C | 18.7 °C | 1165.34 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |