Aberdeen, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 18.4 °C (high). Annual precipitation averages 1231.7 Millimeters. Aberdeen is located in USDA Plant Hardiness Zone 7b. 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 | -3.7 °C | 5.6 °C | 88.14 mm |
| February | -3.2 °C | 7.1 °C | 72.14 mm |
| March | 0.7 °C | 11.7 °C | 109.98 mm |
| April | 6.5 °C | 17.8 °C | 96.77 mm |
| May | 11.8 °C | 23.2 °C | 101.6 mm |
| June | 17.1 °C | 28 °C | 114.3 mm |
| July | 19.9 °C | 30.4 °C | 118.11 mm |
| August | 19 °C | 29.8 °C | 111.25 mm |
| September | 15.2 °C | 26.1 °C | 113.28 mm |
| October | 8.6 °C | 19.7 °C | 110.24 mm |
| November | 2.9 °C | 13.3 °C | 86.11 mm |
| December | -1.2 °C | 7.8 °C | 109.73 mm |
| Annual | 7.8 °C | 18.4 °C | 1231.65 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |