Greenwald, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.9 °F (low) to 52.7 °F (high). Annual precipitation averages 28.3 Inches. Greenwald is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.0 °F | 20.0 °F | 0.69 in. |
| February | 5.7 °F | 25.1 °F | 0.72 in. |
| March | 18.4 °F | 37.5 °F | 1.37 in. |
| April | 32.1 °F | 53.5 °F | 2.44 in. |
| May | 45.2 °F | 67.0 °F | 3.42 in. |
| June | 55.9 °F | 76.9 °F | 4.38 in. |
| July | 60.4 °F | 81.4 °F | 4.23 in. |
| August | 57.5 °F | 79.2 °F | 3.61 in. |
| September | 49.0 °F | 71.2 °F | 2.67 in. |
| October | 35.9 °F | 56.0 °F | 2.69 in. |
| November | 22.6 °F | 38.9 °F | 1.2 in. |
| December | 9.6 °F | 25.6 °F | 0.9 in. |
| Annual | 32.9 °F | 52.7 °F | 28.32 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |