Mount Airy, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.5 °F (low) to 63.4 °F (high). Annual precipitation averages 47 Inches. 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 | 25.0 °F | 39.8 °F | 3.42 in. |
| February | 27.0 °F | 43.2 °F | 2.79 in. |
| March | 33.4 °F | 51.9 °F | 4.02 in. |
| April | 43.4 °F | 64.1 °F | 3.55 in. |
| May | 52.6 °F | 72.7 °F | 4.21 in. |
| June | 61.5 °F | 81.1 °F | 4.51 in. |
| July | 65.9 °F | 85.2 °F | 4.58 in. |
| August | 64.3 °F | 83.3 °F | 3.49 in. |
| September | 58.2 °F | 76.7 °F | 4.79 in. |
| October | 47.0 °F | 64.9 °F | 4.15 in. |
| November | 37.6 °F | 54.0 °F | 3.5 in. |
| December | 29.7 °F | 43.8 °F | 3.96 in. |
| Annual | 45.5 °F | 63.4 °F | 46.97 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |