Hartstown, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.8 °F (low) to 58.6 °F (high). Annual precipitation averages 45.2 Inches. Hartstown is located in USDA Plant Hardiness Zone 6a. 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 | 17.5 °F | 33.5 °F | 3.33 in. |
| February | 17.7 °F | 35.9 °F | 2.33 in. |
| March | 25.4 °F | 45.0 °F | 3.1 in. |
| April | 36.0 °F | 58.4 °F | 4.01 in. |
| May | 46.7 °F | 69.4 °F | 4.04 in. |
| June | 55.5 °F | 77.5 °F | 4.88 in. |
| July | 59.7 °F | 81.3 °F | 4.67 in. |
| August | 57.9 °F | 79.7 °F | 3.94 in. |
| September | 51.5 °F | 73.6 °F | 4.32 in. |
| October | 41.1 °F | 61.5 °F | 3.82 in. |
| November | 32.2 °F | 49.1 °F | 3.35 in. |
| December | 24.0 °F | 38.3 °F | 3.41 in. |
| Annual | 38.8 °F | 58.6 °F | 45.2 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |