Middlefield, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.2 °F (low) to 58.4 °F (high). Annual precipitation averages 44.1 Inches. Middlefield 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 | 17.5 °F | 33.0 °F | 3.24 in. |
| February | 18.2 °F | 35.8 °F | 2.45 in. |
| March | 25.9 °F | 44.9 °F | 3.31 in. |
| April | 36.8 °F | 58.1 °F | 3.96 in. |
| May | 47.4 °F | 69.1 °F | 4.07 in. |
| June | 56.5 °F | 77.5 °F | 4.31 in. |
| July | 60.3 °F | 81.2 °F | 4.51 in. |
| August | 58.6 °F | 79.8 °F | 3.7 in. |
| September | 51.8 °F | 73.5 °F | 4.11 in. |
| October | 41.3 °F | 61.1 °F | 3.79 in. |
| November | 32.1 °F | 48.8 °F | 3.33 in. |
| December | 24.0 °F | 37.9 °F | 3.33 in. |
| Annual | 39.2 °F | 58.4 °F | 44.11 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 | Dfb - Humid Continental Mild Summer, Wet All Year |