Cloud cover and insolation (solar heating) is the primary determinant of weather (short-term) temperature. Over the long term, average cloud cover and insolati

Cloud cover and insolation (solar heating) is the primary determinant of weather (short-term) temperature. Over the long term, average cloud cover and insolation is determined by ... what? Something not modeled, apparently. It's in no small part due to "solar weather" (sunspots), and long term levels of high-level water vapor: > Contrails during day cause cooling because of reflecting of sunlight back into space. During night, they trap infrared heat causing heating. So it is a balance between the two time intervals. We would like to have more CICs (contrail-induced cirrus clouds) during day and none during night.; FAA Scientist: We Want Clouds By Day, None By Night