Stewart, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 64.6 °F (high). Annual precipitation averages 43.3 Inches. Stewart 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.4 °F | 39.4 °F | 3.27 in. |
| February | 22.8 °F | 43.1 °F | 2.95 in. |
| March | 29.8 °F | 52.5 °F | 3.93 in. |
| April | 40.5 °F | 66.9 °F | 3.84 in. |
| May | 50.8 °F | 75.0 °F | 4.23 in. |
| June | 59.7 °F | 82.6 °F | 4.53 in. |
| July | 63.0 °F | 85.7 °F | 4.54 in. |
| August | 61.8 °F | 85.0 °F | 3.24 in. |
| September | 54.1 °F | 78.1 °F | 3.5 in. |
| October | 41.9 °F | 67.3 °F | 3.03 in. |
| November | 32.8 °F | 55.1 °F | 2.94 in. |
| December | 26.8 °F | 44.4 °F | 3.34 in. |
| Annual | 42.1 °F | 64.6 °F | 43.34 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |