Fredericktown, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 15.6 °C (high). Annual precipitation averages 1062 Millimeters. Fredericktown is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 1.1 °C | 84.33 mm |
| February | -7.1 °C | 2.8 °C | 60.96 mm |
| March | -2.6 °C | 8.4 °C | 84.33 mm |
| April | 3.3 °C | 15.9 °C | 98.3 mm |
| May | 9.3 °C | 21.6 °C | 111.51 mm |
| June | 14.4 °C | 26.3 °C | 120.14 mm |
| July | 16.1 °C | 28.2 °C | 105.66 mm |
| August | 15.1 °C | 27.4 °C | 88.9 mm |
| September | 10.9 °C | 24.2 °C | 84.07 mm |
| October | 4.7 °C | 17.4 °C | 71.88 mm |
| November | -0.4 °C | 10 °C | 74.93 mm |
| December | -4.7 °C | 3.7 °C | 76.96 mm |
| Annual | 4.3 °C | 15.6 °C | 1061.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |