Is there an easy way to predict if the night sky will be clear by using observations during the day? Obviously a very cloudy, rainy day will lead to a similar situation at night, unsuitable for stargazing. But it's not always so obvious. During the day, the sky can be filled with clouds one moment and be completely clear the next. Can weather be used as an indicator here? For example, if it's very hot are clear skies more or less likely? I'm ignoring the usual pollution for simplicity.