Seaman, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.3 °F (low) to 64.2 °F (high). Annual precipitation averages 46.4 Inches. Seaman 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 | 22.3 °F | 39.8 °F | 3.24 in. |
| February | 24.8 °F | 44.1 °F | 3.24 in. |
| March | 32.0 °F | 53.2 °F | 4.31 in. |
| April | 41.6 °F | 65.4 °F | 4.52 in. |
| May | 52.0 °F | 73.8 °F | 4.86 in. |
| June | 60.9 °F | 81.8 °F | 4.64 in. |
| July | 64.1 °F | 85.0 °F | 4.79 in. |
| August | 62.1 °F | 84.1 °F | 3.52 in. |
| September | 55.1 °F | 78.7 °F | 3.33 in. |
| October | 43.8 °F | 67.1 °F | 3.15 in. |
| November | 33.7 °F | 53.9 °F | 3.15 in. |
| December | 27.3 °F | 43.8 °F | 3.64 in. |
| Annual | 43.3 °F | 64.2 °F | 46.39 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 |