Campbellsville, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.8 °C (low) to 19.5 °C (high). Annual precipitation averages 1402.9 Millimeters. Campbellsville 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 | -3.5 °C | 6.5 °C | 101.6 mm |
| February | -1.8 °C | 9.1 °C | 104.9 mm |
| March | 1.7 °C | 14 °C | 134.37 mm |
| April | 7.1 °C | 19.8 °C | 123.7 mm |
| May | 12.7 °C | 24.3 °C | 148.08 mm |
| June | 17 °C | 28.7 °C | 134.37 mm |
| July | 18.9 °C | 30.2 °C | 136.65 mm |
| August | 18.2 °C | 29.8 °C | 106.93 mm |
| September | 14.3 °C | 27.2 °C | 108.97 mm |
| October | 7.8 °C | 21.2 °C | 91.19 mm |
| November | 2 °C | 14.1 °C | 93.73 mm |
| December | -1.2 °C | 8.5 °C | 118.36 mm |
| Annual | 7.8 °C | 19.5 °C | 1402.85 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 |