Mount Sterling, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.9 °C (low) to 18.5 °C (high). Annual precipitation averages 1236 Millimeters. Mount Sterling is located in USDA Plant Hardiness Zone 6b. 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 | -4.4 °C | 5.3 °C | 88.9 mm |
| February | -2.9 °C | 7.6 °C | 88.65 mm |
| March | 0.9 °C | 12.6 °C | 109.73 mm |
| April | 6.3 °C | 18.9 °C | 114.55 mm |
| May | 11.8 °C | 23.7 °C | 128.52 mm |
| June | 16.2 °C | 28.1 °C | 124.97 mm |
| July | 18.5 °C | 29.8 °C | 134.62 mm |
| August | 17.2 °C | 29.4 °C | 87.88 mm |
| September | 13.4 °C | 26.4 °C | 97.28 mm |
| October | 6.8 °C | 19.9 °C | 75.44 mm |
| November | 1.3 °C | 13 °C | 80.77 mm |
| December | -2.1 °C | 7.4 °C | 104.65 mm |
| Annual | 6.9 °C | 18.5 °C | 1235.96 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 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 |