Dunnstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.2 °F (low) to 60.9 °F (high). Annual precipitation averages 42.9 Inches. Dunnstown is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 35.0 °F | 2.9 in. |
| February | 19.2 °F | 38.4 °F | 2.34 in. |
| March | 26.5 °F | 47.6 °F | 3.24 in. |
| April | 36.6 °F | 61.5 °F | 3.55 in. |
| May | 47.0 °F | 72.5 °F | 3.91 in. |
| June | 56.1 °F | 80.1 °F | 3.9 in. |
| July | 60.4 °F | 84.6 °F | 4.52 in. |
| August | 58.9 °F | 82.5 °F | 4.41 in. |
| September | 51.7 °F | 75.3 °F | 4.48 in. |
| October | 40.5 °F | 63.3 °F | 3.54 in. |
| November | 30.9 °F | 50.6 °F | 3.01 in. |
| December | 24.0 °F | 39.3 °F | 3.07 in. |
| Annual | 39.2 °F | 60.9 °F | 42.87 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |