Illinois has been much stricter with regulations and shut downs than Wisconsin. They are already phasing back to stricter regulations in several areas of the state where they claim there is an uptick of cases.
Most people have figured out that outdoor activities in the breeze and sunshine are low to no risk, but Illinois will be the one of the last places in the US to accept that fact. At the rate things are going, we will be on restrictions for the rest of the decade!