Profiles of atmospheric pressure, density, and temperature for the region from 20 to 110 km above Fort Churchill, Canada, were computed from the data obtained during a single fall‐day rocket flight. The temperature profile had a major maximum at 58 km, a secondary maximum at 82 km, and several minor maxima in the region from 20 to 55 km. During the same flight a horizontal‐wind profile was obtained in the region from 80 to 115 km. Average wind speed was 125 m/sec, and the maximum wind speed was 250 m/sec at 115 km. The method of measurement, the problems encountered, and the results are discussed. Methods are prescribed for the use of the pitot‐static tube for accurate synoptic atmospheric structure measurements from 20 to 80 km and for the measurement of semidiurnal pressure variations in the same region.