Gratis, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43 °F (low) to 62.9 °F (high). Annual precipitation averages 41.9 Inches. Gratis is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.8 °F | 36.8 °F | 3.15 in. |
| February | 22.9 °F | 40.7 °F | 2.43 in. |
| March | 31.1 °F | 50.9 °F | 3.49 in. |
| April | 41.5 °F | 63.7 °F | 4.39 in. |
| May | 52.5 °F | 73.5 °F | 4.66 in. |
| June | 61.4 °F | 81.8 °F | 4.57 in. |
| July | 64.6 °F | 84.9 °F | 3.87 in. |
| August | 62.7 °F | 84.1 °F | 2.98 in. |
| September | 55.2 °F | 78.3 °F | 2.99 in. |
| October | 43.6 °F | 66.3 °F | 3.07 in. |
| November | 33.5 °F | 52.6 °F | 3.05 in. |
| December | 26.0 °F | 41.1 °F | 3.26 in. |
| Annual | 43 °F | 62.9 °F | 41.91 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |