Atwater, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.8 °F (low) to 53.2 °F (high). Annual precipitation averages 29.6 Inches. 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 | 3.1 °F | 20.7 °F | 0.73 in. |
| February | 6.4 °F | 25.5 °F | 0.8 in. |
| March | 19.3 °F | 38.1 °F | 1.5 in. |
| April | 33.0 °F | 53.9 °F | 2.56 in. |
| May | 46.2 °F | 67.5 °F | 3.6 in. |
| June | 56.8 °F | 77.1 °F | 4.76 in. |
| July | 61.3 °F | 81.5 °F | 4.0 in. |
| August | 58.6 °F | 79.0 °F | 4.03 in. |
| September | 49.9 °F | 71.8 °F | 2.97 in. |
| October | 36.6 °F | 56.8 °F | 2.41 in. |
| November | 23.5 °F | 39.9 °F | 1.31 in. |
| December | 10.5 °F | 26.1 °F | 0.96 in. |
| Annual | 33.8 °F | 53.2 °F | 29.63 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |