Hartford, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8 °C (low) to 20 °C (high). Annual precipitation averages 1285 Millimeters. Hartford 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 | -3.5 °C | 6.3 °C | 92.96 mm |
| February | -2 °C | 8.9 °C | 102.36 mm |
| March | 2.2 °C | 14.2 °C | 118.62 mm |
| April | 7.5 °C | 20.7 °C | 126.49 mm |
| May | 13 °C | 25.3 °C | 139.19 mm |
| June | 17.9 °C | 29.4 °C | 110.74 mm |
| July | 19.8 °C | 31.2 °C | 113.28 mm |
| August | 18.5 °C | 30.8 °C | 86.61 mm |
| September | 14.4 °C | 28 °C | 88.65 mm |
| October | 8.2 °C | 22 °C | 99.06 mm |
| November | 1.9 °C | 14.3 °C | 94.23 mm |
| December | -1.4 °C | 8.5 °C | 112.78 mm |
| Annual | 8 °C | 20 °C | 1284.97 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 |