Republic, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.3 °C (low) to 10.4 °C (high). Annual precipitation averages 806.7 Millimeters. Republic is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.9 °C | -5.8 °C | 42.16 mm |
| February | -16.2 °C | -3.6 °C | 33.02 mm |
| March | -11.6 °C | 2.7 °C | 42.67 mm |
| April | -4.2 °C | 9.4 °C | 67.56 mm |
| May | 2.8 °C | 17.6 °C | 78.99 mm |
| June | 8.4 °C | 23 °C | 87.63 mm |
| July | 10.8 °C | 25.3 °C | 94.49 mm |
| August | 9.9 °C | 24.4 °C | 76.71 mm |
| September | 6.1 °C | 19.9 °C | 89.41 mm |
| October | 0.1 °C | 11.7 °C | 92.96 mm |
| November | -5.4 °C | 3.4 °C | 53.59 mm |
| December | -11.8 °C | -2.9 °C | 47.5 mm |
| Annual | -2.3 °C | 10.4 °C | 806.69 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°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 |