Adamstown, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.8 °F (low) to 65.7 °F (high). Annual precipitation averages 43 Inches. Adamstown is located in USDA Plant Hardiness Zone 7b. 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 | 24.4 °F | 41.5 °F | 2.99 in. |
| February | 25.9 °F | 44.6 °F | 2.45 in. |
| March | 32.4 °F | 53.6 °F | 3.59 in. |
| April | 42.5 °F | 66.1 °F | 3.34 in. |
| May | 52.6 °F | 75.0 °F | 4.23 in. |
| June | 61.6 °F | 83.5 °F | 4.08 in. |
| July | 66.8 °F | 88.2 °F | 4.23 in. |
| August | 64.5 °F | 86.1 °F | 3.22 in. |
| September | 57.3 °F | 79.4 °F | 4.49 in. |
| October | 45.8 °F | 67.8 °F | 3.65 in. |
| November | 35.1 °F | 56.1 °F | 3.12 in. |
| December | 28.9 °F | 45.9 °F | 3.57 in. |
| Annual | 44.8 °F | 65.7 °F | 42.96 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 7b : 5°F to 10°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 |