Stoneboro, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.5 °F (low) to 59.3 °F (high). Annual precipitation averages 45.2 Inches. Stoneboro 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 | 17.4 °F | 34.0 °F | 3.29 in. |
| February | 17.9 °F | 36.8 °F | 2.51 in. |
| March | 25.4 °F | 45.8 °F | 3.29 in. |
| April | 35.7 °F | 59.3 °F | 4.06 in. |
| May | 46.2 °F | 70.2 °F | 3.95 in. |
| June | 55.3 °F | 78.1 °F | 4.89 in. |
| July | 59.3 °F | 82.0 °F | 4.78 in. |
| August | 57.8 °F | 80.6 °F | 3.93 in. |
| September | 51.0 °F | 74.3 °F | 4.18 in. |
| October | 40.4 °F | 62.1 °F | 3.55 in. |
| November | 31.5 °F | 49.4 °F | 3.34 in. |
| December | 23.6 °F | 38.6 °F | 3.42 in. |
| Annual | 38.5 °F | 59.3 °F | 45.19 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 |