This dataset contains yearly, six-year, and ten-year seasonal means of geopotential height, temperature, wind, specific humidity, and vertical motion for atmospheric levels from 1000mb up to 30mb. These means are based on the ECMWF daily operational analyses and are on a global 5-degree latitude/longitude grid.

The ten-year period is March 1979 to February 1989. The six-year climatology is included because the tropical fields were improved significantly when diabatic initialization was introduced into the analysis scheme in September 1982.

More information is available.