Well at least cold (for the time of year) at night. Hope it does not snow before the trackday.
http://www.accuweather.com/us/il/sc...tner=accuweather&traveler=0&zipchg=1&metric=0
http://www.accuweather.com/us/il/sc...tner=accuweather&traveler=0&zipchg=1&metric=0