Contrasting to the outer atmosphere the thermal situation in subway stations is characterized by a high degree of stability and slow response times. Weather conditions influence the conditions within subway stations only with several delay; this is especially the case in multi-story stations where the time lag can amount from hours to several days. Cold fronts that follow after longer periods of hot weather periods can cause extreme differences between the outer atmosphere and that inside stations. Induced by these differences and due to 'jumps' in air temperature over short distances passengers entering a station experience an extreme biometerological load. Also, such extreme temperature differences in the outer atmosphere lead to similar 'jumps' within multi-story subway stations; this is normally due to a relatively quick adjustment of the upper levels to the conditions in the outer atmosphere compared to lower levels that are not as well aerated. This poster introduces the results from different subway systems that show the spatial variability of the thermal situation and the dynamic changes in air temperature distribution within subway stations.