Atwater, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.7 °C (low) to 15.2 °C (high). Annual precipitation averages 1034.8 Millimeters. Atwater 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 | -7.3 °C | 1 °C | 73.41 mm |
| February | -6.8 °C | 2.6 °C | 57.4 mm |
| March | -2.4 °C | 7.8 °C | 79.25 mm |
| April | 3.5 °C | 15.3 °C | 95 mm |
| May | 9.3 °C | 21.2 °C | 101.6 mm |
| June | 14.4 °C | 25.9 °C | 109.73 mm |
| July | 16.5 °C | 28 °C | 107.95 mm |
| August | 15.5 °C | 27.1 °C | 88.9 mm |
| September | 11.6 °C | 23.6 °C | 91.69 mm |
| October | 5.7 °C | 16.8 °C | 82.3 mm |
| November | 0.4 °C | 9.7 °C | 74.17 mm |
| December | -4.1 °C | 3.7 °C | 73.41 mm |
| Annual | 4.7 °C | 15.2 °C | 1034.81 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Dfb - Humid Continental Mild Summer, Wet All Year |