Green Isle, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.2 °F (low) to 54.3 °F (high). Annual precipitation averages 32.4 Inches. 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 | 5.1 °F | 22.1 °F | 1.03 in. |
| February | 8.5 °F | 26.8 °F | 1.03 in. |
| March | 21.2 °F | 39.2 °F | 1.73 in. |
| April | 34.4 °F | 55.0 °F | 2.84 in. |
| May | 47.3 °F | 68.1 °F | 4.23 in. |
| June | 58.1 °F | 77.9 °F | 5.06 in. |
| July | 62.2 °F | 82.3 °F | 3.87 in. |
| August | 59.4 °F | 79.7 °F | 4.22 in. |
| September | 50.9 °F | 72.8 °F | 3.17 in. |
| October | 37.8 °F | 58.2 °F | 2.37 in. |
| November | 25.1 °F | 41.6 °F | 1.54 in. |
| December | 12.2 °F | 27.6 °F | 1.35 in. |
| Annual | 35.2 °F | 54.3 °F | 32.44 in. |
| 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 : -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 |