A description of the seasonal and latitudinal variations in temperature at 30-deg N and 60-deg N between 30 and 50 kilometers altitude over the North American continent. At 30-deg N the observations indicate a tendency for two temperature maxima annually. A statistical analysis of the data at 30-deg N shows the significance of the seasonal variations at 35 and 40 km. The temperature variation at 60-deg N has a single summer maximum and a larger amplitude than at 30-deg N. The largest latitudinal differences occur during winter. 41 pp
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