Mayfield, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38 °F (low) to 58.9 °F (high). Annual precipitation averages 44.3 Inches. 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 | 16.3 °F | 33.4 °F | 3.06 in. |
| February | 17.3 °F | 36.2 °F | 2.43 in. |
| March | 25.0 °F | 44.5 °F | 3.16 in. |
| April | 35.4 °F | 58.5 °F | 3.79 in. |
| May | 45.9 °F | 69.9 °F | 3.91 in. |
| June | 55.1 °F | 77.9 °F | 4.93 in. |
| July | 59.5 °F | 82.4 °F | 4.29 in. |
| August | 57.9 °F | 80.6 °F | 3.91 in. |
| September | 50.7 °F | 73.7 °F | 4.14 in. |
| October | 39.4 °F | 61.5 °F | 4.26 in. |
| November | 30.9 °F | 49.3 °F | 2.97 in. |
| December | 22.9 °F | 38.5 °F | 3.4 in. |
| Annual | 38 °F | 58.9 °F | 44.25 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |