Today, the Asian bush mosquito is known to occur in southwestern Germany (Baden-Württemberg; [26, 27, 42]), in western Germany (Rhineland-Palatinate, North Rhine Westphalia; [29, 30, 50]) and the southern part of Lower Saxony . Interestingly, in the area with the least potential generations per year in the present climatic conditions (southern Germany, Berchtesgaden), the Asian bush mosquito was found in 2015 . In Germany, mean monthly temperatures, as an approximation for relevant water temperatures, do not reach the upper thermal limit for cumulative female survival (Fig. 2) and also the optimal temperature for development is not reached. However, the lower temperature limit is limiting (Figs. 2 and 4). Thus, population growth is restricted by temperature. Based on our data, we hypothesise that the population in Berchtesgaden will not persist multi-annually without migration or human-assisted re-introduction.