Valley City, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.5 °C (low) to 15.5 °C (high). Annual precipitation averages 1042.9 Millimeters. Valley City is located in USDA Plant Hardiness Zone 6b. 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 | -6.8 °C | 1.2 °C | 74.17 mm |
| February | -6.2 °C | 2.7 °C | 59.44 mm |
| March | -1.8 °C | 7.8 °C | 79.76 mm |
| April | 4.1 °C | 15.3 °C | 96.01 mm |
| May | 10.1 °C | 21.4 °C | 105.41 mm |
| June | 15.3 °C | 26.3 °C | 101.85 mm |
| July | 17.4 °C | 28.3 °C | 100.33 mm |
| August | 16.4 °C | 27.5 °C | 92.96 mm |
| September | 12.4 °C | 24 °C | 98.04 mm |
| October | 6.6 °C | 17.2 °C | 86.61 mm |
| November | 1.3 °C | 10.2 °C | 76.2 mm |
| December | -3.4 °C | 3.9 °C | 72.14 mm |
| Annual | 5.5 °C | 15.5 °C | 1042.92 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |