Tontogany, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 60 °F (high). Annual precipitation averages 35.5 Inches. Tontogany 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.5 °F | 32.8 °F | 2.32 in. |
| February | 20.2 °F | 35.9 °F | 2.07 in. |
| March | 28.0 °F | 46.1 °F | 2.46 in. |
| April | 38.5 °F | 59.5 °F | 3.47 in. |
| May | 50.2 °F | 71.1 °F | 3.94 in. |
| June | 60.3 °F | 80.7 °F | 3.63 in. |
| July | 63.5 °F | 84.4 °F | 3.46 in. |
| August | 61.4 °F | 82.2 °F | 3.43 in. |
| September | 54.0 °F | 76.4 °F | 2.86 in. |
| October | 42.9 °F | 63.6 °F | 2.87 in. |
| November | 32.8 °F | 49.4 °F | 2.62 in. |
| December | 24.4 °F | 37.8 °F | 2.33 in. |
| Annual | 41.2 °F | 60 °F | 35.46 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |