The National Snow and Ice Data Center (NSIDC) has made available the data set Daily Arctic Ocean Rawinsonde Data from Soviet Drifting Ice Stations. These measurements include wind direction and speed, atmosphere pressure, humidity, air temperature, geopotential height, and surface-based observations for cloud cover (amount, type, and height) from the Soviet North Pole for the period of April 19, 1954 to July 31, 1990.