Sedan, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 52.7 °F (high). Annual precipitation averages 27.5 Inches. Sedan is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °F | 19.8 °F | 0.66 in. |
| February | 5.4 °F | 24.5 °F | 0.66 in. |
| March | 18.4 °F | 36.8 °F | 1.3 in. |
| April | 32.3 °F | 53.9 °F | 2.35 in. |
| May | 45.4 °F | 66.8 °F | 3.12 in. |
| June | 56.2 °F | 76.7 °F | 4.33 in. |
| July | 60.9 °F | 81.7 °F | 4.11 in. |
| August | 57.8 °F | 79.3 °F | 3.68 in. |
| September | 49.2 °F | 71.6 °F | 2.71 in. |
| October | 36.0 °F | 56.3 °F | 2.59 in. |
| November | 22.6 °F | 39.1 °F | 1.15 in. |
| December | 9.7 °F | 25.4 °F | 0.8 in. |
| Annual | 33 °F | 52.7 °F | 27.46 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |