Understand
Check the weather forecast for Lee's Summit from NOAA.
The point of visiting Lee's Summit is (A. have a family friendly vacation, (B. get away from the hustle of Kansas City. You come here to see historic towns, have great shopping, fish, go boating, and slow your world down. Saying that, Lee's Summit is a large city in land size. So renting a car or driving here are the easiest ways of getting around and getting out. Lee's Summit is a place you really have to experience. When you're here, you can't help but smile!
From LS's location in the midwest it is probaly fall that is the best time. With great weather. Several local festivals. Less crowded stores, restaurants, and attractions. And best of all, the peace and quiet here on weekdays. Spring and summer are still great times to visit themselves, but avoid winter here if you can. They are cold and snowy.