Boscobel, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 14.4 °C (high). Annual precipitation averages 911.1 Millimeters. Boscobel 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 | -12.8 °C | -2.4 °C | 31.75 mm |
| February | -10.8 °C | 0.2 °C | 30.99 mm |
| March | -4.6 °C | 7.1 °C | 52.07 mm |
| April | 2.1 °C | 14.7 °C | 98.81 mm |
| May | 8.4 °C | 21.4 °C | 108.71 mm |
| June | 14.2 °C | 26.6 °C | 135.64 mm |
| July | 16.4 °C | 28.7 °C | 102.87 mm |
| August | 15.3 °C | 27.7 °C | 99.82 mm |
| September | 10.4 °C | 23.7 °C | 88.14 mm |
| October | 3.7 °C | 16.4 °C | 69.6 mm |
| November | -2.8 °C | 7.6 °C | 52.83 mm |
| December | -8.8 °C | 0.6 °C | 39.88 mm |
| Annual | 2.6 °C | 14.4 °C | 911.11 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 |