Mayfield, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 20.3 °C (high). Annual precipitation averages 1343.4 Millimeters. Mayfield is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 7.1 °C | 100.84 mm |
| February | -1 °C | 9.6 °C | 112.01 mm |
| March | 3.3 °C | 15.1 °C | 127.51 mm |
| April | 8.4 °C | 20.9 °C | 132.59 mm |
| May | 14.1 °C | 25.6 °C | 144.53 mm |
| June | 18.8 °C | 29.8 °C | 111.76 mm |
| July | 20.7 °C | 31.5 °C | 106.68 mm |
| August | 19.3 °C | 31.1 °C | 81.28 mm |
| September | 15.2 °C | 28.1 °C | 94.49 mm |
| October | 8.9 °C | 21.8 °C | 96.27 mm |
| November | 3.1 °C | 14.5 °C | 106.93 mm |
| December | -0.8 °C | 8.8 °C | 128.52 mm |
| Annual | 9 °C | 20.3 °C | 1343.41 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |