Hilliard, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 16.8 °C (high). Annual precipitation averages 1034 Millimeters. Hilliard is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 2.1 °C | 73.41 mm |
| February | -5.1 °C | 4.1 °C | 60.96 mm |
| March | -0.6 °C | 9.9 °C | 83.06 mm |
| April | 5.1 °C | 17.4 °C | 99.06 mm |
| May | 11.3 °C | 23.1 °C | 109.22 mm |
| June | 16.2 °C | 27.7 °C | 116.08 mm |
| July | 18.1 °C | 29.2 °C | 104.65 mm |
| August | 16.9 °C | 28.6 °C | 87.38 mm |
| September | 13 °C | 25.6 °C | 79.5 mm |
| October | 6.6 °C | 18.6 °C | 70.1 mm |
| November | 0.9 °C | 10.9 °C | 73.91 mm |
| December | -3.1 °C | 4.7 °C | 76.71 mm |
| Annual | 6.1 °C | 16.8 °C | 1034.04 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |