Uniopolis, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 15.7 °C (high). Annual precipitation averages 1019.6 Millimeters. Uniopolis 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 | -7.2 °C | 0.8 °C | 72.14 mm |
| February | -6.2 °C | 2.7 °C | 59.18 mm |
| March | -1.6 °C | 8.5 °C | 75.95 mm |
| April | 4.3 °C | 15.9 °C | 100.33 mm |
| May | 10.6 °C | 21.9 °C | 107.19 mm |
| June | 15.9 °C | 26.7 °C | 111 mm |
| July | 17.5 °C | 28.6 °C | 108.46 mm |
| August | 16.5 °C | 27.7 °C | 86.36 mm |
| September | 12.5 °C | 24.7 °C | 78.74 mm |
| October | 6.4 °C | 17.7 °C | 72.9 mm |
| November | 0.7 °C | 9.9 °C | 76.96 mm |
| December | -4.1 °C | 3.6 °C | 70.36 mm |
| Annual | 5.4 °C | 15.7 °C | 1019.57 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |