Baraboo, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 56.2 °F (high). Annual precipitation averages 37.8 Inches. 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 | 9.3 °F | 26.5 °F | 1.34 in. |
| February | 12.1 °F | 30.8 °F | 1.34 in. |
| March | 22.8 °F | 42.8 °F | 2.12 in. |
| April | 34.4 °F | 56.4 °F | 4.05 in. |
| May | 46.4 °F | 68.5 °F | 4.33 in. |
| June | 56.6 °F | 78.1 °F | 5.56 in. |
| July | 60.5 °F | 82.0 °F | 4.32 in. |
| August | 58.3 °F | 80.1 °F | 4.45 in. |
| September | 50.1 °F | 72.8 °F | 3.67 in. |
| October | 38.4 °F | 59.6 °F | 2.84 in. |
| November | 27.1 °F | 44.6 °F | 2.09 in. |
| December | 16.3 °F | 32.0 °F | 1.69 in. |
| Annual | 36 °F | 56.2 °F | 37.8 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |