Loudonville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.6 °C (low) to 15.8 °C (high). Annual precipitation averages 1061.7 Millimeters. Loudonville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 1.4 °C | 83.57 mm |
| February | -7.5 °C | 3.1 °C | 61.98 mm |
| March | -3.2 °C | 8.6 °C | 80.26 mm |
| April | 2.5 °C | 16 °C | 98.3 mm |
| May | 8.3 °C | 21.5 °C | 113.03 mm |
| June | 13.6 °C | 26.4 °C | 124.71 mm |
| July | 15.4 °C | 28.1 °C | 101.35 mm |
| August | 14.4 °C | 27.6 °C | 91.19 mm |
| September | 10.1 °C | 24.3 °C | 81.28 mm |
| October | 3.9 °C | 17.6 °C | 75.69 mm |
| November | -0.9 °C | 10.3 °C | 73.91 mm |
| December | -5 °C | 4.1 °C | 76.45 mm |
| Annual | 3.6 °C | 15.8 °C | 1061.72 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |