Greenbush, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.5 °F (low) to 48.2 °F (high). Annual precipitation averages 24.6 Inches. Greenbush is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.3 °F | 13.6 °F | 0.72 in. |
| February | -2.8 °F | 18.4 °F | 0.61 in. |
| March | 11.6 °F | 32.2 °F | 0.81 in. |
| April | 27.8 °F | 49.1 °F | 1.09 in. |
| May | 40.7 °F | 63.5 °F | 3.15 in. |
| June | 52.2 °F | 73.0 °F | 4.64 in. |
| July | 55.4 °F | 77.7 °F | 3.73 in. |
| August | 52.5 °F | 77.2 °F | 3.08 in. |
| September | 43.8 °F | 68.1 °F | 2.67 in. |
| October | 32.3 °F | 52.2 °F | 2.01 in. |
| November | 18.0 °F | 34.2 °F | 1.1 in. |
| December | 3.3 °F | 19.7 °F | 0.95 in. |
| Annual | 27.5 °F | 48.2 °F | 24.56 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |