Being in Florida, I have some experience with what you described. If the inside air was around 100 with the same humidity, and it dropped to 70, you would definitely get condensation inside the
door. This is the same way water gets into our air compressors and pumps. I had a rather unique experience with this many years ago flying skydivers in a small Cessna. We had a weather inversion that meant the air cooled as I climbed to altitude. Usually the cooler air stays close to the ground because it's more dense. Sometimes a cold front overtakes a warm area and the cold air is on top. So after the jumpers left I closed the
door and headed down. Well when the now cool air and panel inside the aircraft dove into the warm moist air below, all of a sudden I had instant condensation on all interior surfaces. Could not see out the windows, and all of the instruments were fogged over. Made for a rather interesting time. Sort of like flying with your eyes closed. Fortunately I just opened the jump
door to look out and see the horizon. But I digress.