Carrolltown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.6 °F (low) to 56.2 °F (high). Annual precipitation averages 44.5 Inches. Carrolltown is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.0 °F | 31.6 °F | 3.31 in. |
| February | 16.6 °F | 34.6 °F | 2.66 in. |
| March | 23.4 °F | 43.4 °F | 3.51 in. |
| April | 34.2 °F | 56.4 °F | 3.72 in. |
| May | 45.1 °F | 66.7 °F | 4.14 in. |
| June | 53.4 °F | 74.6 °F | 4.15 in. |
| July | 57.6 °F | 78.4 °F | 4.45 in. |
| August | 55.7 °F | 76.8 °F | 4.21 in. |
| September | 49.0 °F | 70.4 °F | 4.28 in. |
| October | 38.6 °F | 59.0 °F | 3.2 in. |
| November | 28.3 °F | 46.4 °F | 3.37 in. |
| December | 21.4 °F | 35.8 °F | 3.49 in. |
| Annual | 36.6 °F | 56.2 °F | 44.49 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |