Clay, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 20.2 °C (high). Annual precipitation averages 1242.3 Millimeters. Clay 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 | -3.4 °C | 6.2 °C | 91.95 mm |
| February | -1.8 °C | 8.9 °C | 95.76 mm |
| March | 2.5 °C | 14.2 °C | 123.44 mm |
| April | 8.1 °C | 20.9 °C | 125.22 mm |
| May | 13.9 °C | 25.7 °C | 130.05 mm |
| June | 18.4 °C | 30 °C | 111 mm |
| July | 20.3 °C | 31.7 °C | 113.03 mm |
| August | 19.2 °C | 31.2 °C | 71.12 mm |
| September | 14.9 °C | 28.4 °C | 81.28 mm |
| October | 8.5 °C | 21.9 °C | 90.93 mm |
| November | 2.7 °C | 14.3 °C | 100.33 mm |
| December | -1.3 °C | 8.4 °C | 108.2 mm |
| Annual | 8.5 °C | 20.2 °C | 1242.31 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |