Adamstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 62.3 °F (high). Annual precipitation averages 48.4 Inches. Adamstown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.4 °F | 38.4 °F | 3.22 in. |
| February | 23.4 °F | 40.9 °F | 2.71 in. |
| March | 30.7 °F | 49.6 °F | 3.98 in. |
| April | 41.1 °F | 62.1 °F | 3.83 in. |
| May | 50.8 °F | 71.6 °F | 3.97 in. |
| June | 60.2 °F | 80.3 °F | 4.57 in. |
| July | 65.2 °F | 84.6 °F | 4.76 in. |
| August | 63.6 °F | 82.9 °F | 4.41 in. |
| September | 56.5 °F | 76.5 °F | 5.0 in. |
| October | 45.1 °F | 64.6 °F | 4.67 in. |
| November | 35.5 °F | 53.5 °F | 3.42 in. |
| December | 27.7 °F | 43.1 °F | 3.84 in. |
| Annual | 43.5 °F | 62.3 °F | 48.38 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |