Big Run, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.3 °F (low) to 59.4 °F (high). Annual precipitation averages 44.1 Inches. Big Run 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 | 18.0 °F | 34.2 °F | 3.22 in. |
| February | 18.9 °F | 37.3 °F | 2.45 in. |
| March | 25.6 °F | 46.2 °F | 3.28 in. |
| April | 35.6 °F | 60.3 °F | 3.69 in. |
| May | 45.9 °F | 70.7 °F | 3.86 in. |
| June | 54.9 °F | 77.8 °F | 4.44 in. |
| July | 58.9 °F | 81.5 °F | 4.76 in. |
| August | 57.4 °F | 80.6 °F | 4.01 in. |
| September | 50.7 °F | 74.0 °F | 4.05 in. |
| October | 39.5 °F | 62.1 °F | 3.38 in. |
| November | 30.6 °F | 49.3 °F | 3.4 in. |
| December | 23.8 °F | 38.5 °F | 3.54 in. |
| Annual | 38.3 °F | 59.4 °F | 44.08 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 | Dfb - Humid Continental Mild Summer, Wet All Year |