Atwater, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1 °C (low) to 11.8 °C (high). Annual precipitation averages 752.6 Millimeters. Atwater is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.1 °C | -6.3 °C | 18.54 mm |
| February | -14.2 °C | -3.6 °C | 20.32 mm |
| March | -7.1 °C | 3.4 °C | 38.1 mm |
| April | 0.6 °C | 12.2 °C | 65.02 mm |
| May | 7.9 °C | 19.7 °C | 91.44 mm |
| June | 13.8 °C | 25.1 °C | 120.9 mm |
| July | 16.3 °C | 27.5 °C | 101.6 mm |
| August | 14.8 °C | 26.1 °C | 102.36 mm |
| September | 9.9 °C | 22.1 °C | 75.44 mm |
| October | 2.6 °C | 13.8 °C | 61.21 mm |
| November | -4.7 °C | 4.4 °C | 33.27 mm |
| December | -11.9 °C | -3.3 °C | 24.38 mm |
| Annual | 1 °C | 11.8 °C | 752.58 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |