Mayfield, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 14.9 °C (high). Annual precipitation averages 1123.9 Millimeters. Mayfield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | 0.8 °C | 77.72 mm |
| February | -8.2 °C | 2.3 °C | 61.72 mm |
| March | -3.9 °C | 6.9 °C | 80.26 mm |
| April | 1.9 °C | 14.7 °C | 96.27 mm |
| May | 7.7 °C | 21.1 °C | 99.31 mm |
| June | 12.8 °C | 25.5 °C | 125.22 mm |
| July | 15.3 °C | 28 °C | 108.97 mm |
| August | 14.4 °C | 27 °C | 99.31 mm |
| September | 10.4 °C | 23.2 °C | 105.16 mm |
| October | 4.1 °C | 16.4 °C | 108.2 mm |
| November | -0.6 °C | 9.6 °C | 75.44 mm |
| December | -5.1 °C | 3.6 °C | 86.36 mm |
| Annual | 3.3 °C | 14.9 °C | 1123.94 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |