This study set out to identify the impact of weather types in Krakow on the frequency of suicides by hanging in the period 1991-2002, on cases of acute coronary syndrome (2002-2004), high concentration of suspended particles PM10 and tropospheric ozone (2005-2012) and on the pollen seasons of hazel and birch (1991-2012). Attention was also given to trends of change in selected weather types over the study period (1901-2012). The weather types to be investigated were identified using a number of factors, including: air temperature, relative sunshine duration, precipitation, snow cover, thunderstorms, and sultriness. It was found that some of these weather types could have an adverse effect on human health and even contribute to death.