Foreston, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 11.6 °C (high). Annual precipitation averages 766.6 Millimeters. Foreston 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.9 °C | -6.2 °C | 16.26 mm |
| February | -14.8 °C | -3.2 °C | 20.32 mm |
| March | -7.7 °C | 3.7 °C | 36.32 mm |
| April | -0.4 °C | 11.9 °C | 67.31 mm |
| May | 6.7 °C | 19.4 °C | 98.3 mm |
| June | 12.5 °C | 24.6 °C | 108.71 mm |
| July | 14.9 °C | 26.9 °C | 109.22 mm |
| August | 13.4 °C | 25.9 °C | 101.6 mm |
| September | 8.8 °C | 21.7 °C | 75.69 mm |
| October | 1.8 °C | 13.5 °C | 70.36 mm |
| November | -5.2 °C | 4.2 °C | 36.83 mm |
| December | -12.3 °C | -3.3 °C | 25.65 mm |
| Annual | 0.1 °C | 11.6 °C | 766.57 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°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 |