With a steady climate change increases the risk of weather anomalies. The droughts, forest fires, winter frosts become more frequent that affects the abundance and diversity of animals, including commercial species and crop pests. The deviation of timing of the phases of ontogeny from multiyear is a sensitive indicator of the state and the processes of ecosystems. In order to identify the features of the biota response to extreme weather conditions we studied the reaction of animals of the East Russian Plain (Kirov Region) to weather anomalies of cold winter in 2009-2010 and the hot summer of 2010 according to phenological (1890-2013 years) and phytosanitary (2000-2013 years) monitoring of 52 species Clitellata, Bivalvia, Gastropoda, Insecta, Aves, Mammalia. The observations were carried out on the territory of the boreal ecotone with different changes of hydrothermal regime within Vyatsko-Verkhnekamsk District of the Volga Region.