Which kind of weather is suitable for using remote sensing, sunny or cloudy?

On sunny days, all remote sensing methods are suitable, including optical remote sensing and microwave remote sensing; on cloudy days, because there are more clouds, only microwaves can penetrate clouds and fog, so if you want to detect the surface of the earth, microwave remote sensing methods should be used on cloudy days. .

But if it is a meteorological satellite, clouds are also the object of detection, so optical remote sensing is used