These maps show Earth’s average monthly solar insolation, or the rate of incoming sunlight reaching the surface, from July 2006 to the present as derived from Clouds and Earth’s Radiant Energy System (CERES) measurements of radiant energy escaping the top of Earth’s atmosphere. Learn more at https://svs.gsfc.nasa.gov/vis/a030000/a030300/a030367/ceres_insol_m_2013-09_print.jpg
