Summary: The autor carried out microclimatic observations in the Bükk mountains in Hungary on similarly inclined E- and W-exposed valley slopes day and night between 1 and 20 August, 1970. On the basis of these obervations he compares the extreme values of the soil temperature according to the duration of sunshine of the slopes and according to the different types of the diurnal variation of cloudiness.

He establishes that on clear days the warmest point of the valley in the 2 to 10 cm deep soil layers is on the W-exposed slope, but with the growth of cloudiness the maximum becomes transferred to the valley bottom. The deeper layers are in any kind of cloudiness warmest in the E exposition.

The cause of such a distribution of the soil temperature maximum is that the E - and W-exposed slopes receive different amounts of irradiation according to the diurnal variation of cloudiness.

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