Glenwood, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 12.1 °C (high). Annual precipitation averages 675.9 Millimeters. Glenwood 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 | -16.8 °C | -6.3 °C | 14.73 mm |
| February | -14.7 °C | -3.7 °C | 13.97 mm |
| March | -7.3 °C | 3.3 °C | 28.7 mm |
| April | -0.1 °C | 12.9 °C | 55.37 mm |
| May | 7.1 °C | 20.2 °C | 78.74 mm |
| June | 13 °C | 25.4 °C | 111.76 mm |
| July | 15.3 °C | 27.9 °C | 101.85 mm |
| August | 13.7 °C | 26.9 °C | 93.22 mm |
| September | 9 °C | 22.6 °C | 69.6 mm |
| October | 1.9 °C | 14.3 °C | 63.5 mm |
| November | -5.6 °C | 4.4 °C | 27.43 mm |
| December | -12.8 °C | -3.2 °C | 17.02 mm |
| Annual | 0.2 °C | 12.1 °C | 675.89 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 |