Brunswick, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 59 °F (high). Annual precipitation averages 42.6 Inches. Brunswick is located in USDA Plant Hardiness Zone 6a. 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 | 33.3 °F | 3.1 in. |
| February | 20.1 °F | 35.9 °F | 2.51 in. |
| March | 28.1 °F | 45.4 °F | 3.41 in. |
| April | 39.3 °F | 58.8 °F | 3.87 in. |
| May | 49.8 °F | 69.8 °F | 4.32 in. |
| June | 59.1 °F | 78.4 °F | 3.98 in. |
| July | 62.7 °F | 82.3 °F | 4.07 in. |
| August | 61.1 °F | 80.9 °F | 3.66 in. |
| September | 54.0 °F | 74.4 °F | 4.05 in. |
| October | 43.2 °F | 61.7 °F | 3.52 in. |
| November | 33.4 °F | 49.2 °F | 3.08 in. |
| December | 25.1 °F | 38.0 °F | 2.99 in. |
| Annual | 41.2 °F | 59 °F | 42.56 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 6a : -10°F to -5°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 |