We were waiting for the second leg of our flight, going from Chicago to Green Bay. A barely audible announcement told us that the flight had been cancelled - no explanation given. After standing in line for well over an hour, we were told that the cancellation was for bad weather (despite sunny skies outside AND in Green Bay) and that they could not pay for a hotel room and could not even promise us a flight out the next day. I was forced to pay almost $300 for a rental car, drive unknown roads for 3 hours at night, and despite a complaint to the FAA and United, never received compensation for the missed flight nor for the rental car. United only bragged about their on time record.