Wooster, 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 15.4 °C (high). Annual precipitation averages 1039.1 Millimeters. Wooster 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 | -7.2 °C | 1.1 °C | 68.83 mm |
| February | -6.6 °C | 2.7 °C | 53.85 mm |
| March | -2.1 °C | 8.1 °C | 76.71 mm |
| April | 3.8 °C | 15.6 °C | 99.57 mm |
| May | 9.7 °C | 21.3 °C | 107.95 mm |
| June | 14.7 °C | 26.1 °C | 115.57 mm |
| July | 16.7 °C | 27.8 °C | 104.65 mm |
| August | 15.7 °C | 27.1 °C | 95 mm |
| September | 11.7 °C | 23.8 °C | 87.63 mm |
| October | 5.6 °C | 17 °C | 85.09 mm |
| November | 0.4 °C | 10.1 °C | 74.17 mm |
| December | -3.9 °C | 3.7 °C | 70.1 mm |
| Annual | 4.9 °C | 15.4 °C | 1039.12 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 |