Riverdale, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 13.7 °C (high). Annual precipitation averages 863.4 Millimeters. Riverdale is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | -1.6 °C | 52.07 mm |
| February | -9.4 °C | -0.2 °C | 43.94 mm |
| March | -5 °C | 5.7 °C | 53.85 mm |
| April | 1.2 °C | 13.3 °C | 87.12 mm |
| May | 7.9 °C | 20.1 °C | 95.5 mm |
| June | 13.3 °C | 25.4 °C | 90.93 mm |
| July | 15.1 °C | 27.7 °C | 75.95 mm |
| August | 14.2 °C | 26.6 °C | 89.41 mm |
| September | 9.8 °C | 22.9 °C | 70.87 mm |
| October | 3.9 °C | 15.4 °C | 86.11 mm |
| November | -1.2 °C | 7.9 °C | 65.53 mm |
| December | -5.8 °C | 1.4 °C | 52.07 mm |
| Annual | 2.9 °C | 13.7 °C | 863.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |