Ruthton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12 °C (high). Annual precipitation averages 717.1 Millimeters. Ruthton 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 | -14.8 °C | -5.3 °C | 17.02 mm |
| February | -12.6 °C | -2.8 °C | 19.81 mm |
| March | -6.2 °C | 3.8 °C | 36.83 mm |
| April | 0.4 °C | 12.1 °C | 72.14 mm |
| May | 7.7 °C | 19.4 °C | 98.81 mm |
| June | 13.8 °C | 25 °C | 113.54 mm |
| July | 16 °C | 27.3 °C | 84.58 mm |
| August | 14.5 °C | 26 °C | 86.11 mm |
| September | 9.8 °C | 22.2 °C | 81.53 mm |
| October | 2.3 °C | 14.3 °C | 54.61 mm |
| November | -5 °C | 5.1 °C | 29.21 mm |
| December | -11.4 °C | -2.7 °C | 22.86 mm |
| Annual | 1.2 °C | 12 °C | 717.05 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |