Orth America Land Data Assimilation System Daily Sunlight 1979-2011
The North America Land Data Assimilation System (NLDAS) Daily Sunlight data available on CDC WONDER are county-level daily sunlight (insolation or solar radiation) observations spanning the years 1979-2011. Reported measures are the average daily insolation, reported in kilojoules per square meter (KJ/m2), the number of observations, and the range for the daily insolation values. Data are available by place (combined 48 contiguous states plus the District of Columbia, region, division, state, county), time (year, month, day) and specified daily sunlight value.