Hilliard, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43 °F (low) to 62.3 °F (high). Annual precipitation averages 40.7 Inches. 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 | 20.9 °F | 35.8 °F | 2.89 in. |
| February | 22.8 °F | 39.3 °F | 2.4 in. |
| March | 31.0 °F | 49.9 °F | 3.27 in. |
| April | 41.2 °F | 63.3 °F | 3.9 in. |
| May | 52.3 °F | 73.6 °F | 4.3 in. |
| June | 61.1 °F | 81.8 °F | 4.57 in. |
| July | 64.5 °F | 84.6 °F | 4.12 in. |
| August | 62.5 °F | 83.5 °F | 3.44 in. |
| September | 55.4 °F | 78.0 °F | 3.13 in. |
| October | 43.9 °F | 65.5 °F | 2.76 in. |
| November | 33.7 °F | 51.6 °F | 2.91 in. |
| December | 26.5 °F | 40.5 °F | 3.02 in. |
| Annual | 43 °F | 62.3 °F | 40.71 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |