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The thermal structure of the Inn valley atmosphere is being investigated, in comparison with that over the adjacent plains. A new method has been developed for computing "fictitious", smoothed vertical temperature profiles from SYNOP data, which enables us to derive temperature statistics. In this procedure, pressure and temperature at the Zugspitze mountain observatory play a key role~ The daily range of the barometric mean temperature of an air column in the Inn valley is more than twice that of an air column over Munich. The main reason for this is geometrical: the lesser volume of air in the valley. From a schematic plot of horizontal pressure gradient versus wind speed along the valley we obtain an estimate of typical reaction times for the valley wind system, which are of the order of 30 minutes only. Thus, equilibrium between pressure gradient and friction force is being established quickly.

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