Rock, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 11 °C (high). Annual precipitation averages 916.2 Millimeters. Rock is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.4 °C | -4.2 °C | 44.96 mm |
| February | -13.9 °C | -2.4 °C | 42.16 mm |
| March | -9.1 °C | 2.8 °C | 50.29 mm |
| April | -2.4 °C | 9.6 °C | 75.18 mm |
| May | 4.3 °C | 17.3 °C | 90.17 mm |
| June | 9.6 °C | 22.7 °C | 98.81 mm |
| July | 12.3 °C | 25.6 °C | 96.01 mm |
| August | 11.4 °C | 24.8 °C | 87.88 mm |
| September | 7.5 °C | 20.2 °C | 105.16 mm |
| October | 1.5 °C | 12.4 °C | 100.58 mm |
| November | -3.8 °C | 4.7 °C | 70.36 mm |
| December | -9.7 °C | -1.5 °C | 54.61 mm |
| Annual | -0.5 °C | 11 °C | 916.17 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |