The mesoclimatic conditions are influenced by the form and ruggedness of the terrain and the composition of the active land surface. These influences are most apparent in the deeply incised Dyje river valley (the river phenomenon) and its sidestreams. Inversion effects can be felt in these deep valleys and the climate varies on north-facing and south-facing slopes. The local climate also differs between forested areas and on arable land without vegetation. These local differences together with further ecological factors contribute to the wide variety of biotopes and animal and plant species diversity which we can find in Podyjí NP.
Knowledge of the extent of the inversion areas is of considerable importance. The body of cold air (Inversion area) is characterised by a weak exchange of air in both vertical and horizontal directions. In the NP territory such weak inversions are most common around Vranov nad Dyjí, but they can occur along the whole river valley. In the colder months of the year we can sometimes “see” the inversion areas, by observing the fog which forms below the upper rim of the valley.
The whole of the NP is characterised by winds which predominantly blow from the WNW quadrant (88%). The second most important wind direction is from the south-east (11%). Very weak to insufficient air exchange has been measured around Vranov nad Dyjí.