Frankfort, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.2 °C (low) to 19.1 °C (high). Annual precipitation averages 1236 Millimeters. Frankfort is located in USDA Plant Hardiness Zone 6b. 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 | -5.3 °C | 5.5 °C | 88.9 mm |
| February | -4.2 °C | 8 °C | 90.68 mm |
| March | -0.2 °C | 13.2 °C | 115.32 mm |
| April | 5.1 °C | 19.4 °C | 117.09 mm |
| May | 10.9 °C | 24.2 °C | 130.3 mm |
| June | 15.7 °C | 28.6 °C | 123.95 mm |
| July | 18.2 °C | 30.6 °C | 123.95 mm |
| August | 17 °C | 30.3 °C | 82.55 mm |
| September | 12.9 °C | 27.2 °C | 89.92 mm |
| October | 6.4 °C | 20.9 °C | 86.61 mm |
| November | 0.7 °C | 13.4 °C | 84.07 mm |
| December | -2.7 °C | 7.8 °C | 102.62 mm |
| Annual | 6.2 °C | 19.1 °C | 1235.96 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 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 |