Rock, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.2 °F (low) to 51.8 °F (high). Annual precipitation averages 36.1 Inches. 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 | 7.9 °F | 24.4 °F | 1.77 in. |
| February | 7.0 °F | 27.7 °F | 1.66 in. |
| March | 15.6 °F | 37.1 °F | 1.98 in. |
| April | 27.6 °F | 49.2 °F | 2.96 in. |
| May | 39.7 °F | 63.2 °F | 3.55 in. |
| June | 49.3 °F | 72.9 °F | 3.89 in. |
| July | 54.2 °F | 78.0 °F | 3.78 in. |
| August | 52.6 °F | 76.6 °F | 3.46 in. |
| September | 45.5 °F | 68.4 °F | 4.14 in. |
| October | 34.7 °F | 54.4 °F | 3.96 in. |
| November | 25.2 °F | 40.4 °F | 2.77 in. |
| December | 14.6 °F | 29.3 °F | 2.15 in. |
| Annual | 31.2 °F | 51.8 °F | 36.07 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |