Millersport, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.7 °C (high). Annual precipitation averages 1079 Millimeters. Millersport 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 | -6.6 °C | 2.6 °C | 81.79 mm |
| February | -5.6 °C | 4.3 °C | 64.52 mm |
| March | -1.1 °C | 9.9 °C | 92.46 mm |
| April | 4.6 °C | 17.2 °C | 101.35 mm |
| May | 10.6 °C | 22.5 °C | 105.92 mm |
| June | 15.5 °C | 27.1 °C | 113.79 mm |
| July | 17.4 °C | 28.7 °C | 113.28 mm |
| August | 16.4 °C | 28.2 °C | 91.44 mm |
| September | 12.3 °C | 25.1 °C | 84.58 mm |
| October | 5.9 °C | 18.4 °C | 74.17 mm |
| November | 0.3 °C | 11.2 °C | 75.95 mm |
| December | -3.6 °C | 5.1 °C | 79.76 mm |
| Annual | 5.5 °C | 16.7 °C | 1079.01 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 |