Ruthton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.2 °F (low) to 53.7 °F (high). Annual precipitation averages 28.2 Inches. 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 | 5.4 °F | 22.4 °F | 0.67 in. |
| February | 9.3 °F | 27.0 °F | 0.78 in. |
| March | 20.8 °F | 38.9 °F | 1.45 in. |
| April | 32.8 °F | 53.7 °F | 2.84 in. |
| May | 45.9 °F | 66.9 °F | 3.89 in. |
| June | 56.8 °F | 77.0 °F | 4.47 in. |
| July | 60.8 °F | 81.2 °F | 3.33 in. |
| August | 58.1 °F | 78.8 °F | 3.39 in. |
| September | 49.6 °F | 72.0 °F | 3.21 in. |
| October | 36.2 °F | 57.7 °F | 2.15 in. |
| November | 23.0 °F | 41.1 °F | 1.15 in. |
| December | 11.4 °F | 27.2 °F | 0.9 in. |
| Annual | 34.2 °F | 53.7 °F | 28.23 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |