Valentine’s Day in the Chicago area will be a dangerously chilly affair, with all of northern Illinois under a wind chill advisory issued by the National Weather Service.

The community science project, held over four days every February, collects data that provides scientists with a long-term record of bird distribution across the globe, helping to identify trends that might be associated with urbanization or climate change.

Dirty snow absorbs more of the sun’s energy and melts faster. Here’s why that’s a problem. 

There’s a misperception that birds such as geese and ducks need help finding food when it snows. If they couldn’t cope with Chicago’s winters, they wouldn’t be here, experts say. 

With dangerous subzero wind chill temperatures forecast for the upcoming weekend, officials offered timely reminders of ways to stay safe in extreme cold. 

The landscape has been pretty bleak of late. Here to brighten our outlook: The Garfield Park Conservatory has announced its indoor gardens will reopen to the public at the end of February.

The 18,000-acre restoration site continues to evolve, as this home of the former Joliet Arsenal gradually returns to its native prairie state. 

Across the United States and Canada, pollen season is starting 20 days earlier and pollen loads are 21% higher since 1990 and a huge chunk of that is because of global warming, a new study found in Monday’s journal the Proceedings of the National Academies of Sciences.

The Chicago area saw dangerously cold weather over the weekend, and the week ahead doesn’t appear to offer much relief. But it takes more than a cold snap to bring the city to a standstill.

An ancient sand ridge in the Calumet region became a well-worn route used by enslaved people seeking freedom.

Early detection of the coronavirus is crucial for reducing its spread, even as vaccinations ramp up. Now, researchers have created a DIY smell and taste challenge – and all you need is your morning cup of joe.

Winter has arrived with a vengeance. The next 48 hours will bring a one-two punch of snow and plunging temperatures.

After getting walloped by two big snowstorms, the area is now bracing for bitter cold later this week. We asked Argonne National Laboratory climate scientist Scott Collis what to expect, and what’s driving the arctic chill.

It’s Groundhog Day. Will it be six more weeks of winter or an early spring?

An Amur tiger that underwent hip-replacement surgery only to dislodge the orthopedic implant within hours has been operated on again, officials at a suburban Chicago zoo said Monday. 

After years of work, pedestrians and cyclists can now stay on the lakefront trail as it crosses the Chicago River – though the full Navy Pier flyover isn’t finished just yet.