In the temperate climates of the northern and southern hemispheres, respiratory infections have always occurred preferentially in the winter months. Even ancient writers wrote about it. The seasonal fluctuations in the spread dynamics of the SARS-CoV-2 coronavirus were also very pronounced during the coronavirus pandemic. However, the reasons for this seasonal variation are still not fully understood.

On closer inspection, however, it is not the case that respiratory infections only

A correlation is established between relative humidity and transmission efficiency of respiratory infections. The theoretical considerations are confirmed on the basis of data on the seasonal course of the corona pandemic.