Darwin, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.3 °F (low) to 53.4 °F (high). Annual precipitation averages 29.9 Inches. Darwin 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 | 4.0 °F | 21.1 °F | 0.72 in. |
| February | 6.9 °F | 25.5 °F | 0.81 in. |
| March | 20.0 °F | 38.3 °F | 1.48 in. |
| April | 33.5 °F | 54.2 °F | 2.61 in. |
| May | 46.6 °F | 67.5 °F | 3.92 in. |
| June | 57.5 °F | 77.2 °F | 4.74 in. |
| July | 61.6 °F | 81.4 °F | 3.8 in. |
| August | 58.8 °F | 79.0 °F | 4.06 in. |
| September | 50.3 °F | 72.1 °F | 3.15 in. |
| October | 37.1 °F | 57.1 °F | 2.36 in. |
| November | 24.0 °F | 40.5 °F | 1.31 in. |
| December | 11.3 °F | 26.7 °F | 0.98 in. |
| Annual | 34.3 °F | 53.4 °F | 29.94 in. |
| 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 : -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 |