Cayce, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 20.6 °C (high). Annual precipitation averages 1342.7 Millimeters. Cayce is located in USDA Plant Hardiness Zone 7b. 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 | -2.5 °C | 7.2 °C | 100.84 mm |
| February | -0.9 °C | 9.8 °C | 109.22 mm |
| March | 3.6 °C | 15.3 °C | 125.48 mm |
| April | 8.6 °C | 20.9 °C | 135.89 mm |
| May | 14.3 °C | 25.9 °C | 145.8 mm |
| June | 18.7 °C | 30.3 °C | 105.66 mm |
| July | 20.6 °C | 31.9 °C | 104.39 mm |
| August | 19.3 °C | 31.3 °C | 80.52 mm |
| September | 14.9 °C | 28.2 °C | 96.27 mm |
| October | 8.4 °C | 22.4 °C | 97.54 mm |
| November | 2.9 °C | 14.8 °C | 112.52 mm |
| December | -1.1 °C | 9.1 °C | 128.52 mm |
| Annual | 8.9 °C | 20.6 °C | 1342.65 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |