Beaver Dam, 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 13.2 °C (high). Annual precipitation averages 906.8 Millimeters. Beaver Dam 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.1 °C | -3.2 °C | 38.35 mm |
| February | -10.8 °C | -1.2 °C | 37.59 mm |
| March | -4.7 °C | 5.6 °C | 50.29 mm |
| April | 1.8 °C | 13.1 °C | 90.68 mm |
| May | 8.2 °C | 19.9 °C | 103.12 mm |
| June | 13.8 °C | 25.3 °C | 125.22 mm |
| July | 16.1 °C | 27.3 °C | 105.92 mm |
| August | 14.9 °C | 26.3 °C | 100.84 mm |
| September | 10.5 °C | 22.7 °C | 84.58 mm |
| October | 4 °C | 15.2 °C | 74.42 mm |
| November | -2.2 °C | 7.1 °C | 52.83 mm |
| December | -8.4 °C | -0.2 °C | 42.93 mm |
| Annual | 2.6 °C | 13.2 °C | 906.77 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |