Seaforth, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.4 °C (low) to 12.7 °C (high). Annual precipitation averages 736.8 Millimeters. Seaforth 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 | -15.2 °C | -5.1 °C | 16.76 mm |
| February | -12.9 °C | -2.6 °C | 19.3 mm |
| March | -6.1 °C | 4.1 °C | 39.37 mm |
| April | 0.9 °C | 13 °C | 71.12 mm |
| May | 8.1 °C | 20.5 °C | 98.55 mm |
| June | 14.3 °C | 26 °C | 115.57 mm |
| July | 16.2 °C | 28.2 °C | 89.15 mm |
| August | 14.7 °C | 26.9 °C | 93.22 mm |
| September | 9.7 °C | 23.2 °C | 80.77 mm |
| October | 2.6 °C | 15.2 °C | 55.88 mm |
| November | -4.6 °C | 5.6 °C | 33.27 mm |
| December | -11.3 °C | -2.2 °C | 23.88 mm |
| Annual | 1.4 °C | 12.7 °C | 736.84 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |