On average two of your six days the weather will be less than ideal. Either too warm, too cold, too windy, too rainy etc. The deer are still out there. Their movement during hunting hours may not be as active as the other days of your hunt but these days can be productive nonetheless. Illinois is a highly agricultural state.
Private land has a higher concentration of agriculture than does public land.
Deer here are used to what they consider normal activity. Things such as farm machinery, oilfield equipment, an old man picking pecans, a farm kid on a four-wheeler, the neighbor's dog. Some of the largest deer taken every year in Illinois are killed within 200 yards of a farm house. These are some of the areas that deer feel the safest in. We hunt these areas.