Clay Center, 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 15.4 °C (high). Annual precipitation averages 915.4 Millimeters. Clay Center is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 0.6 °C | 60.71 mm |
| February | -6.5 °C | 2.2 °C | 55.63 mm |
| March | -2.1 °C | 7.6 °C | 66.8 mm |
| April | 4 °C | 14.7 °C | 95.25 mm |
| May | 10.5 °C | 21.2 °C | 89.92 mm |
| June | 16.1 °C | 26.8 °C | 90.68 mm |
| July | 18.1 °C | 29 °C | 86.36 mm |
| August | 17.2 °C | 27.7 °C | 83.57 mm |
| September | 13.3 °C | 24.4 °C | 79.25 mm |
| October | 6.4 °C | 17.3 °C | 74.42 mm |
| November | 0.7 °C | 9.7 °C | 71.37 mm |
| December | -4 °C | 3.3 °C | 61.47 mm |
| Annual | 5.5 °C | 15.4 °C | 915.43 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |