Abstract
Mean monthly atmospheric properties for latitudes 30, 45 and 6ON are described. Temperature-height profiles were objectively derived from observed winds and temperatures, resulting in a family of atmospheres with internally consistent thermodynamic properties. The amplitude of seasonal changes in mean monthly temperatures and densities between 30 and 80 km increases with increasing latitude. The transition from one season to another of mean monthly atmospheric properties is relatively smooth except from late January to April in subarctic regions.
