Huntsville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 15.7 °C (high). Annual precipitation averages 1053.4 Millimeters. Huntsville 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 | -7.5 °C | 0.8 °C | 74.68 mm |
| February | -6.3 °C | 2.8 °C | 57.15 mm |
| March | -1.7 °C | 8.6 °C | 77.72 mm |
| April | 3.9 °C | 15.9 °C | 103.63 mm |
| May | 10.3 °C | 21.8 °C | 108.97 mm |
| June | 15.5 °C | 26.6 °C | 117.35 mm |
| July | 17.1 °C | 28.4 °C | 114.81 mm |
| August | 16.2 °C | 27.7 °C | 90.68 mm |
| September | 12.3 °C | 24.7 °C | 80.77 mm |
| October | 6.1 °C | 17.7 °C | 73.66 mm |
| November | 0.3 °C | 9.9 °C | 79.25 mm |
| December | -4.2 °C | 3.6 °C | 74.68 mm |
| Annual | 5.2 °C | 15.7 °C | 1053.35 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |