Ashley K. answered 04/18/19
Science Tutor Chick
Your guess is accurate! Clouds do act as a blanket, to keep warmth in and also heat out. So, on clear, moonlit nights, the air may seem more crisp and cool since the lack of clouds is allowing the radiation to escape back into space. Similarly, when its cloudier and hazy at night, you may notice it to be a warmer and more humid night as the clouds keep the warmth from that summer day within it. I hope this helps!