Walnut Creek, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.2 °C (low) to 15.7 °C (high). Annual precipitation averages 1052.6 Millimeters. Walnut Creek 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7 °C | 1.5 °C | 76.45 mm |
| February | -6.3 °C | 3.2 °C | 57.91 mm |
| March | -1.8 °C | 8.7 °C | 82.04 mm |
| April | 4.2 °C | 16.1 °C | 96.27 mm |
| May | 10.1 °C | 21.6 °C | 103.89 mm |
| June | 15 °C | 26.3 °C | 123.19 mm |
| July | 17.1 °C | 28.1 °C | 105.16 mm |
| August | 16.1 °C | 27.4 °C | 95.76 mm |
| September | 12.2 °C | 24 °C | 82.8 mm |
| October | 6.1 °C | 17.3 °C | 79.5 mm |
| November | 0.7 °C | 10.3 °C | 74.42 mm |
| December | -3.7 °C | 4.2 °C | 75.18 mm |
| Annual | 5.2 °C | 15.7 °C | 1052.57 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |