Gratz, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.7 °C (low) to 19 °C (high). Annual precipitation averages 1222.5 Millimeters. Gratz is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 5.1 °C | 88.39 mm |
| February | -3.8 °C | 7.5 °C | 84.84 mm |
| March | 0.3 °C | 12.9 °C | 110.24 mm |
| April | 5.7 °C | 19.7 °C | 119.63 mm |
| May | 11.4 °C | 24.3 °C | 139.19 mm |
| June | 16.1 °C | 28.7 °C | 122.17 mm |
| July | 18.4 °C | 30.6 °C | 112.78 mm |
| August | 17.7 °C | 30.1 °C | 97.28 mm |
| September | 13.6 °C | 26.9 °C | 84.84 mm |
| October | 7.1 °C | 20.8 °C | 86.11 mm |
| November | 1.1 °C | 13.3 °C | 83.82 mm |
| December | -2.5 °C | 7.5 °C | 93.22 mm |
| Annual | 6.7 °C | 19 °C | 1222.51 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |