I have a couple of wonderings about relative humidity under different circumstances, During hot weather periods RH gets high. Is this because water evaporates from oceans and such? Shouldn't how weather result in low RH since hot air can hold more moisture? During the winter RH usually gets low. Is that because the air simply isn't as moist during the winter? I know cold air can't hold as much water, but then, where did it go? When it rains or snows, does that necessarily mean that RH is around 80-90, or can it still be around 60 even with such weather? Say you have a basement with concrete walls that are quite cool. If there is an issue with mildew, is the best remedy to heat the basement? Won't the hot air just condensate when it hits the walls like on a cold glass of beer in the summer?