Zanesville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 17.1 °C (high). Annual precipitation averages 1062.5 Millimeters. Zanesville 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.9 °C | 79.5 mm |
| February | -5.7 °C | 4.7 °C | 64.77 mm |
| March | -1.7 °C | 10.4 °C | 88.65 mm |
| April | 4.1 °C | 18 °C | 96.27 mm |
| May | 10.1 °C | 23.1 °C | 102.87 mm |
| June | 14.9 °C | 27.4 °C | 116.84 mm |
| July | 17.2 °C | 29.3 °C | 105.41 mm |
| August | 16.3 °C | 28.7 °C | 97.54 mm |
| September | 11.9 °C | 25.2 °C | 86.87 mm |
| October | 5.4 °C | 18.2 °C | 71.37 mm |
| November | 0.1 °C | 11.4 °C | 74.68 mm |
| December | -3.6 °C | 5.4 °C | 77.72 mm |
| Annual | 5.2 °C | 17.1 °C | 1062.49 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |