Coldwater, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16 °C (high). Annual precipitation averages 1022.1 Millimeters. Coldwater is located in USDA Plant Hardiness Zone 6a. 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 | -7.3 °C | 0.8 °C | 69.6 mm |
| February | -6.1 °C | 2.9 °C | 56.9 mm |
| March | -1.6 °C | 8.8 °C | 74.93 mm |
| April | 4.2 °C | 16.4 °C | 99.82 mm |
| May | 10.6 °C | 22.3 °C | 108.71 mm |
| June | 15.8 °C | 27.1 °C | 114.05 mm |
| July | 17.4 °C | 28.8 °C | 113.03 mm |
| August | 16.3 °C | 27.9 °C | 91.44 mm |
| September | 12.2 °C | 25.1 °C | 76.96 mm |
| October | 6.2 °C | 18.1 °C | 72.14 mm |
| November | 0.6 °C | 10.1 °C | 76.96 mm |
| December | -4.1 °C | 3.5 °C | 67.56 mm |
| Annual | 5.4 °C | 16 °C | 1022.1 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 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 |