Carol Silvestri has a little fun with her penguin hat as she braves chilling temperatures during an annual trip to the city with her sisters, Thursday, Dec. 10, 2009, in Chicago. Commuters from Des Moines to Chicago braced for single digit temperatures and icy roads, while the National Weather Service predicted wind chill values as low as negative 25 F (-31C) in parts of Wisconsin, Iowa and Illinois.
(AP Photo/M. Spencer Green)