Barbourville, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.8 °C (low) to 20 °C (high). Annual precipitation averages 1371.3 Millimeters. Barbourville is located in USDA Plant Hardiness Zone 7a. 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 °C | 7.5 °C | 110.74 mm |
| February | -2.6 °C | 9.9 °C | 114.3 mm |
| March | 0.8 °C | 14.9 °C | 123.95 mm |
| April | 5.7 °C | 20.7 °C | 126.75 mm |
| May | 11.6 °C | 24.9 °C | 117.35 mm |
| June | 15.9 °C | 29 °C | 128.78 mm |
| July | 18.2 °C | 30.3 °C | 145.03 mm |
| August | 17.6 °C | 29.7 °C | 105.41 mm |
| September | 13.6 °C | 27.1 °C | 95 mm |
| October | 6.4 °C | 21.2 °C | 75.18 mm |
| November | 0.7 °C | 14.8 °C | 97.28 mm |
| December | -1.9 °C | 9.6 °C | 131.57 mm |
| Annual | 6.8 °C | 20 °C | 1371.34 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |