Mount Sterling, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 16.7 °C (high). Annual precipitation averages 1042.2 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 | -6.3 °C | 2.4 °C | 77.72 mm |
| February | -5.3 °C | 4.2 °C | 60.71 mm |
| March | -0.9 °C | 9.9 °C | 87.38 mm |
| April | 4.9 °C | 17.1 °C | 98.04 mm |
| May | 11.1 °C | 22.8 °C | 115.57 mm |
| June | 16.1 °C | 27.3 °C | 116.08 mm |
| July | 17.7 °C | 28.9 °C | 103.12 mm |
| August | 16.4 °C | 28.4 °C | 89.41 mm |
| September | 12.3 °C | 25.4 °C | 74.68 mm |
| October | 6.2 °C | 18.6 °C | 69.34 mm |
| November | 0.6 °C | 10.9 °C | 77.72 mm |
| December | -3.2 °C | 4.9 °C | 72.39 mm |
| Annual | 5.8 °C | 16.7 °C | 1042.16 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |