Viroqua, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 54.3 °F (high). Annual precipitation averages 37.7 Inches. Viroqua is located in USDA Plant Hardiness Zone 5a. 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 | 8.3 °F | 24.1 °F | 1.07 in. |
| February | 12.0 °F | 28.8 °F | 1.07 in. |
| March | 23.1 °F | 41.1 °F | 1.97 in. |
| April | 34.9 °F | 55.2 °F | 3.96 in. |
| May | 46.7 °F | 67.1 °F | 4.83 in. |
| June | 56.8 °F | 76.3 °F | 5.82 in. |
| July | 60.8 °F | 80.0 °F | 4.5 in. |
| August | 58.6 °F | 78.1 °F | 4.54 in. |
| September | 50.2 °F | 70.9 °F | 3.68 in. |
| October | 38.6 °F | 57.9 °F | 2.7 in. |
| November | 26.4 °F | 42.2 °F | 1.98 in. |
| December | 15.4 °F | 29.6 °F | 1.57 in. |
| Annual | 36 °F | 54.3 °F | 37.69 in. |
| 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 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 |