Tuesday is the first official day of winter, but according to Iowa State Climatologist Harry Hillaker, it doesn’t mean that it will be any colder than we are used to. December 21st is the shortest day of the year, which means less solar energy for the northern hemisphere, something that Hillaker says will affect our region later on rather than immediately. Hillaker adds that the coldest time is typically 3-4 weeks after the first day of winter, and continues until March. In addition, he says that Marion County residents will have a white Christmas this year. He expects a snowstorm later this week.