Roberts, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.3 °C (low) to 12 °C (high). Annual precipitation averages 839 Millimeters. Roberts 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.1 °C | -5.4 °C | 19.81 mm |
| February | -13.3 °C | -2.7 °C | 18.03 mm |
| March | -6.5 °C | 4.3 °C | 37.85 mm |
| April | 0.8 °C | 12.4 °C | 73.66 mm |
| May | 7.8 °C | 19.4 °C | 102.87 mm |
| June | 13.5 °C | 24.7 °C | 130.05 mm |
| July | 15.9 °C | 27.1 °C | 115.32 mm |
| August | 14.6 °C | 25.9 °C | 112.01 mm |
| September | 10.1 °C | 21.7 °C | 92.2 mm |
| October | 2.9 °C | 13.8 °C | 69.34 mm |
| November | -4 °C | 5.1 °C | 39.37 mm |
| December | -11 °C | -2.5 °C | 28.45 mm |
| Annual | 1.3 °C | 12 °C | 838.96 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |