The higher the temps, the more molecules 'vibrate' and the more space to allow for other molecules. More water can be 'dissolved' into the air at higher temps, less at lower temps. That is the simple explanation. In Ohio, we get very hot, humid summer days. When a cooler front moves in, it causes the vapor to condense and fall as rain. The air cannot hold as much vapor at the lower temps. So, if your cooler lowers temperatures, it is acting like a cold front. Evaporation lowers temperatures, too, by using energy. I hope this helps.
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