Republic, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.9 °F (low) to 50.8 °F (high). Annual precipitation averages 31.8 Inches. 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 | 3.3 °F | 21.6 °F | 1.66 in. |
| February | 2.9 °F | 25.5 °F | 1.3 in. |
| March | 11.1 °F | 36.9 °F | 1.68 in. |
| April | 24.4 °F | 48.9 °F | 2.66 in. |
| May | 37.1 °F | 63.7 °F | 3.11 in. |
| June | 47.1 °F | 73.4 °F | 3.45 in. |
| July | 51.5 °F | 77.6 °F | 3.72 in. |
| August | 49.8 °F | 76.0 °F | 3.02 in. |
| September | 43.0 °F | 67.9 °F | 3.52 in. |
| October | 32.2 °F | 53.0 °F | 3.66 in. |
| November | 22.2 °F | 38.2 °F | 2.11 in. |
| December | 10.7 °F | 26.7 °F | 1.87 in. |
| Annual | 27.9 °F | 50.8 °F | 31.76 in. |
| 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 : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |