Pressure and temperature variations at Sault Ste. Marie during 1938–39 for all levels up to 20 km. have been studied. The pressure extremes are progressively retarded at higher levels in the troposphere, while in the stratosphere the retardation decreases so that the phase becomes more nearly that of the surface pressure. The temperature extremes at greater altitudes in the troposphere are advanced with respect to the surface values. In the stratosphere the temperature variation reverses phase. Pressure and temperature anomalies are discussed in their relation to advection. High surface pressures are accompanied by a warm troposphere and a cold stratosphere. The opposite is true of low surface pressures. Seasonal differences in pressure and temperature variations are discussed.