Danbury, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.4 °C (low) to 11.7 °C (high). Annual precipitation averages 783.6 Millimeters. Danbury is located in USDA Plant Hardiness Zone 4a. 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 | -17.1 °C | -5.7 °C | 20.07 mm |
| February | -15.3 °C | -2.6 °C | 20.83 mm |
| March | -8.1 °C | 4.3 °C | 35.56 mm |
| April | -1.1 °C | 11.9 °C | 68.58 mm |
| May | 5.9 °C | 19.6 °C | 92.96 mm |
| June | 11.6 °C | 24.4 °C | 106.17 mm |
| July | 14.1 °C | 26.7 °C | 112.52 mm |
| August | 12.8 °C | 25.6 °C | 97.54 mm |
| September | 8.3 °C | 21.3 °C | 86.36 mm |
| October | 1.6 °C | 13.3 °C | 73.66 mm |
| November | -5.2 °C | 4.4 °C | 39.12 mm |
| December | -12.6 °C | -2.9 °C | 30.23 mm |
| Annual | -0.4 °C | 11.7 °C | 783.6 mm |
| 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |