Gratiot, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.3 °F (low) to 61.4 °F (high). Annual precipitation averages 42.3 Inches. Gratiot 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 | 19.9 °F | 36.2 °F | 3.22 in. |
| February | 21.5 °F | 39.3 °F | 2.58 in. |
| March | 29.4 °F | 49.4 °F | 3.54 in. |
| April | 39.8 °F | 62.6 °F | 3.94 in. |
| May | 50.0 °F | 72.0 °F | 4.11 in. |
| June | 59.0 °F | 79.9 °F | 4.64 in. |
| July | 62.5 °F | 83.2 °F | 4.24 in. |
| August | 60.7 °F | 82.1 °F | 3.65 in. |
| September | 53.2 °F | 76.1 °F | 3.4 in. |
| October | 41.8 °F | 64.4 °F | 2.88 in. |
| November | 32.3 °F | 51.5 °F | 2.99 in. |
| December | 25.2 °F | 40.6 °F | 3.09 in. |
| Annual | 41.3 °F | 61.4 °F | 42.28 in. |
| 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 : -10°F to -5°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 |