Menahga, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 10.2 °C (high). Annual precipitation averages 688.1 Millimeters. Menahga is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.6 °C | -7.9 °C | 16.76 mm |
| February | -17 °C | -5 °C | 16.51 mm |
| March | -9.3 °C | 2.1 °C | 30.73 mm |
| April | -1.4 °C | 10.7 °C | 52.83 mm |
| May | 5.9 °C | 18.1 °C | 88.9 mm |
| June | 11.9 °C | 23.2 °C | 110.49 mm |
| July | 14.5 °C | 26.1 °C | 106.93 mm |
| August | 12.9 °C | 25.1 °C | 75.18 mm |
| September | 8.3 °C | 20.4 °C | 70.36 mm |
| October | 1.3 °C | 11.8 °C | 68.83 mm |
| November | -6.2 °C | 2.6 °C | 27.43 mm |
| December | -13.9 °C | -4.9 °C | 23.11 mm |
| Annual | -1 °C | 10.2 °C | 688.06 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |