South Fork, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.9 °F (low) to 59.5 °F (high). Annual precipitation averages 47.4 Inches. South Fork 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 | 18.5 °F | 34.8 °F | 3.51 in. |
| February | 19.8 °F | 37.7 °F | 3.14 in. |
| March | 26.4 °F | 46.3 °F | 3.94 in. |
| April | 36.9 °F | 60.4 °F | 4.03 in. |
| May | 46.9 °F | 70.1 °F | 4.37 in. |
| June | 55.4 °F | 77.8 °F | 4.6 in. |
| July | 59.3 °F | 81.6 °F | 4.55 in. |
| August | 57.8 °F | 80.2 °F | 4.36 in. |
| September | 51.2 °F | 73.9 °F | 4.18 in. |
| October | 40.3 °F | 62.0 °F | 3.54 in. |
| November | 30.7 °F | 49.7 °F | 3.49 in. |
| December | 23.8 °F | 39.1 °F | 3.68 in. |
| Annual | 38.9 °F | 59.5 °F | 47.39 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |