Greenup, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 19.2 °C (high). Annual precipitation averages 1108.2 Millimeters. Greenup is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5 °C | 5.8 °C | 81.53 mm |
| February | -4.1 °C | 7.9 °C | 80.52 mm |
| March | -0.4 °C | 13.2 °C | 103.63 mm |
| April | 5.2 °C | 20.2 °C | 96.77 mm |
| May | 10.8 °C | 24.7 °C | 115.06 mm |
| June | 15.9 °C | 28.6 °C | 106.68 mm |
| July | 18.2 °C | 30.4 °C | 118.87 mm |
| August | 17.2 °C | 30.1 °C | 84.33 mm |
| September | 13.1 °C | 26.9 °C | 85.34 mm |
| October | 6.3 °C | 20.8 °C | 76.96 mm |
| November | 0.4 °C | 13.7 °C | 70.1 mm |
| December | -2.6 °C | 7.9 °C | 88.39 mm |
| Annual | 6.3 °C | 19.2 °C | 1108.18 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |