Wisconsin State Capitol on a snowy day. (Baylor Spears | Wisconsin Examiner)

Depending on your perspective, some of the most anticipated or dreaded parts of Wisconsin’s climate are winter snows and cold. This year, a blanket of snow around the holidays had all but melted away by the new year. In the future, holiday seasons accompanied by white, glittering snowfall will be less and less common. 

That’s according to a report by Climate Central, a recipient of funding by the Bezos Earth Fund and the Schmidt Family Foundation which describes itself as a policy-neutral, independent group of scientists and communicators.  The report found that over the last decade Wisconsin has seen more winter days above freezing. Those warmer temperatures have ripple effects on snowfall, winter recreation and ecosystems. Climate Central researched the effects of climate change in Wisconsin using meteorological data from 2014-2023, with a focus on the winter months from December to February. The analysis found that during those months over the last decade, nearly 40% of Wisconsin’s 72 counties added a week’s worth of above-freezing winter days. 

Wisconsin was one of 50 states and 123 countries and territories included in the report. Data for  901 cities covered observed average temperatures from 2014-2023, as well as estimates of what temperatures would have  been without human-induced climate change due to fossil fuels and greenhouse gas emissions. The report found “locations across the globe where cold winter days are disappearing in a warming world, compared to a world without climate change.” 

For individual Wisconsin counties, that meant significant increases in the average number of days above freezing. The report found that Milwaukee County, for example, added an average of 13 days above freezing, the most of any county. Ozaukee and Kenosha counties added 12 days, while Door, Racine, and Manitowoc added 11 days. The counties of Kewaunee, Waukesha, Sheboygan, and Washington all added an average of 10 more winter days above freezing over the last decade. 

The numbers across other Wisconsin counties showed a similarly dramatic shift.  In Wood County between 2014-23, according to the report, there was an average of 10 days above freezing during the winter months, with five days added by climate change. In Marinette County, there was an average of 10 days above freezing, with five attributed to climate change. In Brown County, there were 12 days above freezing, with six of them added by climate change, according to the report. 

But in a state known for its harsh winter weather, is milder weather really all that bad? “I like to call these strangely warm winter days delight-mares,” Kristina Dahl, vice president of science at Climate Central, told  Wisconsin Examiner in an email. “Having a relatively warm winter day can be a delightful break from the coldest, darkest season of the year. But if you take a half step back and think about why that day is so warm – or what it might mean for your local economy or ecosystems – you’re confronted with the reality that human-caused climate change is altering so many aspects of our daily lives.”

Addressing the effects of climate change has been a growing concern statewide. Some regions experience greater shoreline erosion, crops grown by agricultural communities struggle because of  volatile winters, unpredictable springs and dry summers. 

Noticeable swings in weather patterns have increasingly made headlines in Wisconsin. In 2021, there was  severe summer flooding in parts of Milwaukee, and strong winds downed hundreds of trees. In mid-December of the same year, temperatures in Milwaukee and Madison reached the low 60s. States across the Midwest experienced a rash of tornadoes which killed dozens of people. In January 2022, the previous year’s record-setting warm weather was replaced by arctic cold. During that summer, lives were lost in Milwaukee due to extreme heat and flooding. Extreme heat was a concern again in 2023, when a wildfire in Waushara County burned over 800 acres.  

The warmer winter weather has also started to change traditional recreation in Wisconsin. Last winter, some snowboarding and skiing spots closed due to lack of snow. The same thing happened during the winter of 2022. The Wisconsin Department of Natural Resources (DNR) has long highlighted the effects of climate change on activities like ice fishing, snowmobiling, snowshoeing, boating, hunting and other outdoor activities which Wisconsin is known for. Fishing alone represents a $2 billion industry in Wisconsin.

“Warming winter days, like those we document in this report, have repercussions throughout our society,” said Dahl. “When days are above freezing, any precipitation will come in the form of rain rather than snow, and snow on the ground begins to melt. That means that winter sports and recreation – an important facet of staying active in the winter months and an important source of revenue for our economy – are threatened. It also means that traditions and cultures can be impacted, for example, through the loss of access to traditional Indigenous hunting grounds. And because many crops, including apples, require a certain amount of chilling time in the winter in order to produce fruit come spring or summer, warming winter days can translate to reduced crop productivity.” 

As cold and inconvenient as snow can be, its disappearance changes many things which have come to define Wisconsin. 

This report has been updated with a link to the Climate Central webpage for its report.

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