Brimfield, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.7 °F (low) to 59.2 °F (high). Annual precipitation averages 41.1 Inches. Brimfield 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 | 19.0 °F | 33.6 °F | 2.9 in. |
| February | 20.0 °F | 36.4 °F | 2.28 in. |
| March | 27.7 °F | 45.8 °F | 3.16 in. |
| April | 38.6 °F | 59.1 °F | 3.72 in. |
| May | 49.0 °F | 70.3 °F | 4.04 in. |
| June | 58.3 °F | 78.3 °F | 4.31 in. |
| July | 62.0 °F | 82.1 °F | 4.16 in. |
| August | 60.3 °F | 80.8 °F | 3.61 in. |
| September | 53.3 °F | 74.0 °F | 3.67 in. |
| October | 42.6 °F | 61.8 °F | 3.34 in. |
| November | 33.1 °F | 49.2 °F | 2.97 in. |
| December | 25.0 °F | 38.4 °F | 2.93 in. |
| Annual | 40.7 °F | 59.2 °F | 41.09 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |