Rossburg, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.8 °C (high). Annual precipitation averages 1029.2 Millimeters. Rossburg 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 | -7.6 °C | 0.9 °C | 70.87 mm |
| February | -6.3 °C | 3.1 °C | 57.66 mm |
| March | -1.6 °C | 8.8 °C | 79.5 mm |
| April | 4.2 °C | 16.1 °C | 102.62 mm |
| May | 10.6 °C | 21.9 °C | 109.73 mm |
| June | 15.8 °C | 26.7 °C | 114.05 mm |
| July | 17.2 °C | 28.3 °C | 107.7 mm |
| August | 15.9 °C | 27.7 °C | 87.63 mm |
| September | 11.8 °C | 24.9 °C | 77.47 mm |
| October | 5.7 °C | 17.9 °C | 72.64 mm |
| November | 0.2 °C | 10.1 °C | 78.23 mm |
| December | -4.4 °C | 3.6 °C | 71.12 mm |
| Annual | 5.1 °C | 15.8 °C | 1029.22 mm |
| 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |