Cohasset, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.6 °F (low) to 50.5 °F (high). Annual precipitation averages 28.1 Inches. Cohasset is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °F | 18.0 °F | 0.82 in. |
| February | 1.4 °F | 24.5 °F | 0.73 in. |
| March | 14.8 °F | 37.5 °F | 1.15 in. |
| April | 28.5 °F | 51.4 °F | 1.93 in. |
| May | 41.2 °F | 65.0 °F | 3.16 in. |
| June | 51.7 °F | 73.9 °F | 4.41 in. |
| July | 56.5 °F | 78.5 °F | 4.2 in. |
| August | 54.2 °F | 76.8 °F | 3.41 in. |
| September | 46.0 °F | 68.1 °F | 3.21 in. |
| October | 34.3 °F | 53.2 °F | 2.64 in. |
| November | 21.1 °F | 36.3 °F | 1.39 in. |
| December | 6.9 °F | 23.2 °F | 1.01 in. |
| Annual | 29.6 °F | 50.5 °F | 28.06 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |