Campbelltown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 62.6 °F (high). Annual precipitation averages 46.1 Inches. Campbelltown 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.6 °F | 37.9 °F | 3.19 in. |
| February | 22.7 °F | 40.7 °F | 2.54 in. |
| March | 30.4 °F | 49.8 °F | 3.79 in. |
| April | 40.7 °F | 62.5 °F | 3.65 in. |
| May | 50.8 °F | 72.4 °F | 3.98 in. |
| June | 60.2 °F | 81.1 °F | 4.38 in. |
| July | 64.6 °F | 85.8 °F | 4.6 in. |
| August | 62.8 °F | 83.8 °F | 4.05 in. |
| September | 55.7 °F | 76.9 °F | 4.82 in. |
| October | 44.1 °F | 64.9 °F | 4.25 in. |
| November | 34.2 °F | 53.3 °F | 3.26 in. |
| December | 26.8 °F | 42.6 °F | 3.57 in. |
| Annual | 42.9 °F | 62.6 °F | 46.08 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |