An information system was created based on а large set of soil and air temperature data obtained during the ecological monitoring of mountain ecosystems in the Murmansk Region in 2012–2022. The measurements were made in 44 natural and disturbed mountain ecosystems in the Khibiny Mountain Massif (northern taiga subzone) and in the trilateral Pasvik Nature Reserve (forest-tundra subzone) using stand-alone programmable data loggers. Simultaneously, a pine-small-leaved forest with zonaltype soil (Humic Podzol) was investigated as the control for mountain ecosystems. The information system includes more than 160 thousand primary records registered by loggers at a frequency of 1 to 4 hours, and more than 16 thousand values calculated for 15 temperature variables. It will serve as the basis for the future database named “Temperature Database of Mountain Soils of the Kola Subarctic”. The article discusses the structure and content of the information system, as well as the use of temperature data in environmental monitoring of polar mountains soils and invertebrates inhabiting them.