Junction City, 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 16.7 °C (high). Annual precipitation averages 1092.2 Millimeters. Junction City is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 2.8 °C | 82.8 mm |
| February | -5.9 °C | 4.5 °C | 67.56 mm |
| March | -1.6 °C | 10.1 °C | 93.73 mm |
| April | 4 °C | 17.4 °C | 104.14 mm |
| May | 9.7 °C | 22.4 °C | 107.7 mm |
| June | 14.6 °C | 26.7 °C | 116.84 mm |
| July | 16.7 °C | 28.5 °C | 112.01 mm |
| August | 15.7 °C | 28 °C | 87.63 mm |
| September | 11.6 °C | 24.8 °C | 83.57 mm |
| October | 5.3 °C | 18.4 °C | 77.72 mm |
| November | -0.2 °C | 11.3 °C | 77.72 mm |
| December | -3.9 °C | 5.2 °C | 80.77 mm |
| Annual | 4.9 °C | 16.7 °C | 1092.19 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |