1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993. NASA Langley Atmospheric Sciences Data Center. This polygon shapefile contains data for wind speed at 50 m above the surface of the Earth (m/s) These data are 10-year monthly and annual averages... NASA Langley Atmospheric Sciences Data Center.