Annual Weather Averages in Wausau. Based on weather reports collected during 1985–2015. The amount of rain/snow in December is normal with an average of 63mm (2.5in). ... High/Low/Average Temperatures, Heating/Cooling Degree Days and Growing Degree Days United States Winter, Wisconsin Long Range Weather Forecast Helping You Avoid Bad Weather. This month is known as a chilly month. Climate data and weather averages in Wausau. Recommended for Wisconsin Average Ice-In and Ice-Out Dates for Lake Winnebago. The December weather guide for Green Bay, Wisconsin shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute.Find out more about our data sources.. July is the hottest month for Wisconsin with an average high temperature of 81.0°, which ranks it as one of the coolest states. Average Weather during December in West Allis (Wisconsin), United States of America. December 2020 Summary Precipitation Forecast Wetter Than Normal. Climate is the average of weather over time. ... WI Monthly Weather. Weather.com brings you the most accurate monthly weather forecast for with average/record and high/low temperatures, precipitation and more. The coterminous US annual average temperature was 55 degrees Fahrenheit, or 2.2 Fahrenheit degrees above the 20th century long term average temperature and 0.07 Fahrenheit degrees above the previous highest nationwide temperature set in 1998. Wisconsin weather in December 2020. Average Season Snowfall Across Wisconsin Get the latest coronavirus (COVID-19) updates for the USA with current travel advice, statistics and online resources.. Below are average maximum temperatures at popular destinations in Wisconsin in December. Southern Wisconsin to enjoy quiet weather to start December Dec 1, 2020 No precipitation is in the forecast for the first week of December for southern Wisconsin, with highs around to slightly above normal, according to forecasters. 5°C sea temperature; Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec. The average minimum temperature (usually the minimum temperature is noted during the night) in West Allis in December is -7.0°C (19.4°F). Weather.com brings you the most accurate monthly weather forecast for with average/record and high/low temperatures, precipitation and more. Average Weather in December in Milwaukee Wisconsin, United States. In Wisconsin, there are 4 comfortable months with high temperatures in the range of 70-85°. HYD - Wisconsin Temperature and Precipitation Summary Issued: 12/07/2020 09:31:46 AM CST. Text listing of Max/Min/Precipitation across Wisconsin (HYD) (Go to an Archive Of HYD Text) Wisconsin Historical Frost Depth Information. 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