its because sweat does not evaporate easily in humid weather because the air already has enough vapor in it. As a result, sweat remains on the skin and the body does not cool down efficiently,unlike during hot,dry days when sweat quickly evaporates from the skin.
No. The temperature doesn't have to be the same for a liquid to evaperate. so if the temperature was constanly changing then the liquid could still evaperate.
boiling point =100 C==>373 K
freezing point=0C===>273 K
on a rainy day ,the humidity level will be more.as the humidity in the atmosphere is more,it cant take in more water.so because of this the clothes will take much time to get dry