Sunbury, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.2 °F (low) to 61.6 °F (high). Annual precipitation averages 41.9 Inches. Sunbury 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.1 °F | 35.4 °F | 3.09 in. |
| February | 21.8 °F | 38.6 °F | 2.38 in. |
| March | 30.2 °F | 49.3 °F | 3.34 in. |
| April | 40.6 °F | 62.6 °F | 3.98 in. |
| May | 51.2 °F | 72.8 °F | 4.28 in. |
| June | 60.4 °F | 80.9 °F | 4.63 in. |
| July | 63.8 °F | 83.9 °F | 4.41 in. |
| August | 61.8 °F | 82.7 °F | 3.56 in. |
| September | 54.6 °F | 77.0 °F | 3.35 in. |
| October | 43.0 °F | 64.7 °F | 2.87 in. |
| November | 33.2 °F | 51.3 °F | 3.0 in. |
| December | 25.6 °F | 40.1 °F | 3.05 in. |
| Annual | 42.2 °F | 61.6 °F | 41.94 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |