What kind of weather is suitable for using remote sensing on sunny and cloudy days?

All remote sensing methods, including optical remote sensing and microwave remote sensing, are suitable for sunny days; On cloudy days, because there are many clouds, only microwaves can penetrate the clouds, so if the surface is detected, microwave remote sensing should be used on cloudy days. But if it is a meteorological satellite, clouds are also the object of detection, so optical remote sensing should be used.