Green Isle, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 12.4 °C (high). Annual precipitation averages 824 Millimeters. Green Isle 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 | -14.9 °C | -5.5 °C | 26.16 mm |
| February | -13.1 °C | -2.9 °C | 26.16 mm |
| March | -6 °C | 4 °C | 43.94 mm |
| April | 1.3 °C | 12.8 °C | 72.14 mm |
| May | 8.5 °C | 20.1 °C | 107.44 mm |
| June | 14.5 °C | 25.5 °C | 128.52 mm |
| July | 16.8 °C | 27.9 °C | 98.3 mm |
| August | 15.2 °C | 26.5 °C | 107.19 mm |
| September | 10.5 °C | 22.7 °C | 80.52 mm |
| October | 3.2 °C | 14.6 °C | 60.2 mm |
| November | -3.8 °C | 5.3 °C | 39.12 mm |
| December | -11 °C | -2.4 °C | 34.29 mm |
| Annual | 1.8 °C | 12.4 °C | 823.98 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |