Sheffield, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 14.4 °C (high). Annual precipitation averages 1178.1 Millimeters. Sheffield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | 0 °C | 92.2 mm |
| February | -8.9 °C | 1.4 °C | 62.48 mm |
| March | -5.1 °C | 6.5 °C | 79.5 mm |
| April | 0.7 °C | 14.3 °C | 102.62 mm |
| May | 6.6 °C | 20.8 °C | 99.06 mm |
| June | 11.5 °C | 25.2 °C | 115.82 mm |
| July | 13.8 °C | 27.4 °C | 119.38 mm |
| August | 13.2 °C | 26.6 °C | 104.14 mm |
| September | 9.6 °C | 22.9 °C | 103.89 mm |
| October | 3.8 °C | 15.8 °C | 98.55 mm |
| November | -1.1 °C | 8.7 °C | 99.06 mm |
| December | -5.1 °C | 2.7 °C | 101.35 mm |
| Annual | 2.5 °C | 14.4 °C | 1178.05 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |