Fultonham, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16.6 °C (high). Annual precipitation averages 1069.8 Millimeters. Fultonham 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.7 °C | 81.28 mm |
| February | -5.8 °C | 4.4 °C | 66.29 mm |
| March | -1.5 °C | 10.1 °C | 88.65 mm |
| April | 4.2 °C | 17.3 °C | 101.35 mm |
| May | 9.8 °C | 22.4 °C | 104.65 mm |
| June | 14.7 °C | 26.7 °C | 117.09 mm |
| July | 16.7 °C | 28.6 °C | 106.93 mm |
| August | 15.7 °C | 28 °C | 88.39 mm |
| September | 11.6 °C | 24.6 °C | 88.14 mm |
| October | 5.3 °C | 18.1 °C | 73.15 mm |
| November | 0 °C | 11.2 °C | 76.45 mm |
| December | -3.8 °C | 5.2 °C | 77.47 mm |
| Annual | 5 °C | 16.6 °C | 1069.84 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |