Middletown, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.2 °F (low) to 64.7 °F (high). Annual precipitation averages 43.1 Inches. Middletown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.3 °F | 40.9 °F | 3.06 in. |
| February | 25.4 °F | 44.5 °F | 2.46 in. |
| March | 32.5 °F | 52.9 °F | 3.65 in. |
| April | 42.0 °F | 65.2 °F | 3.57 in. |
| May | 51.7 °F | 73.9 °F | 4.3 in. |
| June | 60.6 °F | 82.4 °F | 3.97 in. |
| July | 65.0 °F | 87.0 °F | 4.1 in. |
| August | 63.2 °F | 85.0 °F | 3.27 in. |
| September | 56.3 °F | 78.2 °F | 4.4 in. |
| October | 45.4 °F | 66.7 °F | 3.62 in. |
| November | 35.2 °F | 55.2 °F | 3.15 in. |
| December | 28.2 °F | 44.7 °F | 3.52 in. |
| Annual | 44.2 °F | 64.7 °F | 43.07 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |