Sligo, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.2 °F (low) to 60 °F (high). Annual precipitation averages 45.8 Inches. Sligo 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.8 °F | 34.6 °F | 3.46 in. |
| February | 18.4 °F | 37.5 °F | 2.56 in. |
| March | 25.4 °F | 46.9 °F | 3.36 in. |
| April | 35.3 °F | 60.6 °F | 3.94 in. |
| May | 45.5 °F | 71.5 °F | 3.84 in. |
| June | 54.7 °F | 78.9 °F | 5.06 in. |
| July | 58.7 °F | 82.3 °F | 4.91 in. |
| August | 57.5 °F | 81.7 °F | 4.1 in. |
| September | 50.6 °F | 74.7 °F | 4.1 in. |
| October | 39.8 °F | 62.3 °F | 3.44 in. |
| November | 30.5 °F | 49.8 °F | 3.55 in. |
| December | 23.7 °F | 38.9 °F | 3.52 in. |
| Annual | 38.2 °F | 60 °F | 45.84 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |