Frystown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 62.4 °F (high). Annual precipitation averages 48.1 Inches. Frystown 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 | 20.8 °F | 37.7 °F | 3.38 in. |
| February | 22.0 °F | 40.5 °F | 2.68 in. |
| March | 29.8 °F | 49.4 °F | 3.97 in. |
| April | 39.8 °F | 62.1 °F | 3.95 in. |
| May | 50.0 °F | 72.1 °F | 3.89 in. |
| June | 59.3 °F | 80.8 °F | 4.91 in. |
| July | 63.7 °F | 85.5 °F | 4.6 in. |
| August | 61.9 °F | 83.6 °F | 4.25 in. |
| September | 54.7 °F | 76.8 °F | 4.83 in. |
| October | 43.1 °F | 64.9 °F | 4.34 in. |
| November | 33.5 °F | 53.1 °F | 3.39 in. |
| December | 26.3 °F | 42.4 °F | 3.92 in. |
| Annual | 42.1 °F | 62.4 °F | 48.11 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |