Suffield, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.2 °F (low) to 59 °F (high). Annual precipitation averages 40.7 Inches. Suffield 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.2 °F | 33.4 °F | 2.86 in. |
| February | 20.3 °F | 36.2 °F | 2.3 in. |
| March | 28.1 °F | 45.6 °F | 3.16 in. |
| April | 39.1 °F | 59.1 °F | 3.72 in. |
| May | 49.6 °F | 69.8 °F | 4.03 in. |
| June | 59.0 °F | 78.3 °F | 4.43 in. |
| July | 62.6 °F | 82.1 °F | 4.02 in. |
| August | 61.0 °F | 80.6 °F | 3.59 in. |
| September | 54.0 °F | 74.0 °F | 3.5 in. |
| October | 43.1 °F | 61.9 °F | 3.29 in. |
| November | 33.2 °F | 49.0 °F | 2.97 in. |
| December | 25.1 °F | 38.2 °F | 2.85 in. |
| Annual | 41.2 °F | 59 °F | 40.72 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |