Luther, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.3 °C (low) to 12.9 °C (high). Annual precipitation averages 911.1 Millimeters. Luther is located in USDA Plant Hardiness Zone 5a. 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 | -10.7 °C | -2.4 °C | 61.21 mm |
| February | -11.1 °C | -0.7 °C | 45.72 mm |
| March | -6.9 °C | 5.1 °C | 55.63 mm |
| April | -0.5 °C | 12.4 °C | 90.68 mm |
| May | 5.9 °C | 19.6 °C | 90.68 mm |
| June | 11.3 °C | 24.8 °C | 91.69 mm |
| July | 13.3 °C | 27 °C | 80.77 mm |
| August | 12.4 °C | 25.9 °C | 84.07 mm |
| September | 8.3 °C | 21.9 °C | 81.28 mm |
| October | 2.7 °C | 14.3 °C | 96.77 mm |
| November | -2.4 °C | 6.6 °C | 74.93 mm |
| December | -7 °C | 0.5 °C | 57.66 mm |
| Annual | 1.3 °C | 12.9 °C | 911.09 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |