Swanville, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 11.4 °C (high). Annual precipitation averages 728.7 Millimeters. Swanville is located in USDA Plant Hardiness Zone 4a. 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 | -17.1 °C | -6.6 °C | 18.03 mm |
| February | -15 °C | -3.7 °C | 18.29 mm |
| March | -7.8 °C | 3.3 °C | 34.8 mm |
| April | -0.4 °C | 11.8 °C | 63.5 mm |
| May | 6.8 °C | 19.3 °C | 88.65 mm |
| June | 12.7 °C | 24.7 °C | 116.59 mm |
| July | 15.2 °C | 27.3 °C | 104.9 mm |
| August | 13.6 °C | 26.1 °C | 86.87 mm |
| September | 9 °C | 21.6 °C | 72.39 mm |
| October | 1.9 °C | 13.2 °C | 70.87 mm |
| November | -5.4 °C | 3.8 °C | 30.73 mm |
| December | -12.5 °C | -3.6 °C | 23.11 mm |
| Annual | 0.1 °C | 11.4 °C | 728.73 mm |
| 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |