Baraboo, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 13.4 °C (high). Annual precipitation averages 960.1 Millimeters. Baraboo is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.6 °C | -3.1 °C | 34.04 mm |
| February | -11.1 °C | -0.7 °C | 34.04 mm |
| March | -5.1 °C | 6 °C | 53.85 mm |
| April | 1.3 °C | 13.6 °C | 102.87 mm |
| May | 8 °C | 20.3 °C | 109.98 mm |
| June | 13.7 °C | 25.6 °C | 141.22 mm |
| July | 15.8 °C | 27.8 °C | 109.73 mm |
| August | 14.6 °C | 26.7 °C | 113.03 mm |
| September | 10.1 °C | 22.7 °C | 93.22 mm |
| October | 3.6 °C | 15.3 °C | 72.14 mm |
| November | -2.7 °C | 7 °C | 53.09 mm |
| December | -8.7 °C | 0 °C | 42.93 mm |
| Annual | 2.2 °C | 13.4 °C | 960.14 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°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 |