Howard, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 16.1 °C (high). Annual precipitation averages 1067.1 Millimeters. Howard 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 | -7.7 °C | 1.8 °C | 81.03 mm |
| February | -6.8 °C | 3.5 °C | 63.25 mm |
| March | -2.4 °C | 9.1 °C | 84.58 mm |
| April | 3.2 °C | 16.5 °C | 99.82 mm |
| May | 9.1 °C | 21.9 °C | 111.25 mm |
| June | 14.2 °C | 26.6 °C | 123.44 mm |
| July | 16.1 °C | 28.4 °C | 104.65 mm |
| August | 15.1 °C | 27.9 °C | 88.65 mm |
| September | 10.8 °C | 24.5 °C | 82.55 mm |
| October | 4.4 °C | 17.8 °C | 73.66 mm |
| November | -0.6 °C | 10.6 °C | 74.93 mm |
| December | -4.6 °C | 4.3 °C | 79.25 mm |
| Annual | 4.2 °C | 16.1 °C | 1067.06 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 |