Mount Airy, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 17.4 °C (high). Annual precipitation averages 1193 Millimeters. Mount Airy is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.9 °C | 4.3 °C | 86.87 mm |
| February | -2.8 °C | 6.2 °C | 70.87 mm |
| March | 0.8 °C | 11.1 °C | 102.11 mm |
| April | 6.3 °C | 17.8 °C | 90.17 mm |
| May | 11.4 °C | 22.6 °C | 106.93 mm |
| June | 16.4 °C | 27.3 °C | 114.55 mm |
| July | 18.8 °C | 29.6 °C | 116.33 mm |
| August | 17.9 °C | 28.5 °C | 88.65 mm |
| September | 14.6 °C | 24.8 °C | 121.67 mm |
| October | 8.3 °C | 18.3 °C | 105.41 mm |
| November | 3.1 °C | 12.2 °C | 88.9 mm |
| December | -1.3 °C | 6.6 °C | 100.58 mm |
| Annual | 7.5 °C | 17.4 °C | 1193.04 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |