Bryan, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 60 °F (high). Annual precipitation averages 36.7 Inches. Bryan 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.0 °F | 32.4 °F | 2.36 in. |
| February | 18.6 °F | 35.7 °F | 2.1 in. |
| March | 27.0 °F | 46.3 °F | 2.44 in. |
| April | 37.0 °F | 59.8 °F | 3.57 in. |
| May | 48.8 °F | 71.3 °F | 4.1 in. |
| June | 58.8 °F | 80.9 °F | 3.8 in. |
| July | 62.0 °F | 84.7 °F | 3.62 in. |
| August | 59.9 °F | 82.4 °F | 3.56 in. |
| September | 52.2 °F | 76.5 °F | 3.12 in. |
| October | 41.2 °F | 63.4 °F | 2.74 in. |
| November | 31.2 °F | 49.0 °F | 2.94 in. |
| December | 22.8 °F | 37.2 °F | 2.37 in. |
| Annual | 39.7 °F | 60 °F | 36.72 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |