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Estimated January and July zonal wind patterns are described to 120 km from the equator to 75N. Time cross sections of mean monthly zonal winds to 120 km for latitudes 30 and 60N are also shown. Day-to-day fluctuations of zonal and meridional winds between 25 and 65 km are greater in January than in July and appear larger during the day than at night. These data indicate that a monthly wind climatology prepared for various times of day would provide improved estimates of the wind for specific times and altitudes. Also, it is suggested that the large observed diurnal variability of zonal winds at heights between 90 and 120 km may be partially due to a nocturnal contraction and daytime expansion of the atmosphere. (Author)