Shullsburg, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 13.7 °C (high). Annual precipitation averages 980.9 Millimeters. Shullsburg is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12 °C | -2.9 °C | 35.05 mm |
| February | -10.1 °C | -0.4 °C | 38.35 mm |
| March | -3.9 °C | 6.5 °C | 53.34 mm |
| April | 2.2 °C | 14.1 °C | 98.81 mm |
| May | 8.7 °C | 20.6 °C | 110.74 mm |
| June | 14.4 °C | 25.9 °C | 146.81 mm |
| July | 16.5 °C | 27.7 °C | 119.89 mm |
| August | 15.3 °C | 26.8 °C | 104.14 mm |
| September | 10.7 °C | 23.1 °C | 97.79 mm |
| October | 4.2 °C | 15.9 °C | 74.42 mm |
| November | -2.2 °C | 7.4 °C | 57.4 mm |
| December | -8.2 °C | 0.2 °C | 44.2 mm |
| Annual | 3 °C | 13.7 °C | 980.94 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |