Rockland, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 13.5 °C (high). Annual precipitation averages 917.2 Millimeters. Rockland is located in USDA Plant Hardiness Zone 4b. 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 | -13.4 °C | -3.3 °C | 28.19 mm |
| February | -11.6 °C | -0.7 °C | 28.45 mm |
| March | -5.2 °C | 6.1 °C | 46.74 mm |
| April | 1.6 °C | 13.8 °C | 95.25 mm |
| May | 8.2 °C | 20.7 °C | 118.11 mm |
| June | 13.8 °C | 26.1 °C | 137.16 mm |
| July | 15.9 °C | 28.1 °C | 107.44 mm |
| August | 14.7 °C | 27.1 °C | 109.47 mm |
| September | 10 °C | 22.8 °C | 96.52 mm |
| October | 3.3 °C | 15.3 °C | 67.56 mm |
| November | -3 °C | 6.7 °C | 45.47 mm |
| December | -9.4 °C | -0.5 °C | 36.83 mm |
| Annual | 2.1 °C | 13.5 °C | 917.19 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 4b : -31.7°C to -28.9°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 |