Wellington, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 15.3 °C (high). Annual precipitation averages 1011.2 Millimeters. Wellington 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 | -7.4 °C | 0.9 °C | 70.36 mm |
| February | -6.8 °C | 2.3 °C | 56.9 mm |
| March | -2.3 °C | 7.7 °C | 73.15 mm |
| April | 3.6 °C | 15.2 °C | 96.27 mm |
| May | 9.6 °C | 21.3 °C | 100.08 mm |
| June | 14.9 °C | 26.2 °C | 105.41 mm |
| July | 16.9 °C | 28.2 °C | 100.33 mm |
| August | 15.9 °C | 27.4 °C | 95.5 mm |
| September | 11.8 °C | 23.9 °C | 89.15 mm |
| October | 5.8 °C | 17.2 °C | 82.8 mm |
| November | 0.7 °C | 10 °C | 73.41 mm |
| December | -4.1 °C | 3.7 °C | 67.82 mm |
| Annual | 4.9 °C | 15.3 °C | 1011.18 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |