Weather conditions may increase the risk of wildlife-train collisions. Previous studies on this topic were conducted mostly in Scandinavia or Canada and showed that the depth of snow cover is the main factor increasing the number of moose-train collisions. In Poland the depth of snow cover is lower than in Scandinavia and Canada and it varies in different parts of the country. The number of moose in Poland increased since 2001, but the most collisions with trains were recorded for roe deer, followed by wild boar and red deer. Therefore, the aim of the study was to determine the influence of depth of snow cover and other selected weather conditions (temperature, total precipitation) on the risk of train collisions with four ungulate species (roe deer, red deer, moose and wild boar). The data on train collisions with wild ungulate species in Poland from years 2012-2015 were available from the Bureau of Environmental Protection, Polish Railways PKP S.A. Data on weather factors were taken from the synoptic station closest to the accident site. We correlated the daily sum of precipitation and the minimum and maximum temperature, as well as the depth of snow cover with the number of train collisions with each of four chosen species. In total, 3576 cases of collisions were analyzed. The daily sum of precipitation and the minimum and maximum temperature did not affect the number of railway collisions in the case of most of the analyzed species. The height of snow cover significantly increased the risk of collision with roe deer, red deer and wild boar. We found no correlations between the weather conditions and the number of moose-train collisions in Poland, probably because of small number of accidents during the four years of research. The climate that occurs in Poland is the temperate climate, with wide temperature ranges and no deep snow cover. Such climate cause that analysed weather conditions did not influence the risk of ungulate-train collisions.