CARDS Monthly Statistics is digital data set DSI-6307, archived at the National Climatic Data Center (NCDC). This data set uses data from Comprehensive Aerological Data Set (CARDS) (DSI-6305), also archived at NCDC. DSI-6307 is similar in concept and format to Monthly Aerological Data Set (MONADS) (DSI-6220), another digital data set archived at NCDC. DSI-6305 and DSI-6220 are monthly upper air ... statistics. DSI-6307 data are for surface, tropopause, and mandatory pressure levels. At each level, monthly statistical parameters are provided for geopotential height or pressure, temperature, relative humidity, specific humidity, dew point temperature, wind speed, zonal wind speed, and meridional wind speed. Those statistical parameters are: mean value; standard deviation; minimum value; maximum value; first, second, and third quartile values, and number of non-missing observations used in the calculations. Data are global, from 1948 through 2001. NCDC maintains this data set in archive but no longer updates nor actively distributes it. It has been superseded by the Integrated Global Radiosonde Archive (IGRA) (C00616).