This data set includes soil temperature data from boreholes located at five stations in Russia: Yakutsk, Verkhoyansk, Pokrovsk, Isit', and Churapcha. The data have been compiled into five Microsoft Excel files, one for each station. Air temperature measured at these five stations was also included when available. This data set was compiled to go with a classroom learning activity called "How Permanent is Permafrost." To view the activity, see the PDF file of the same name under the General Resources section below. There are two different versions of the Excel files: a complete version and a subsetted version. Both versions exist for each of the five stations for a total of 10 files. The complete versions of the files contain borehole temperature data at all available standard depths: 0.2 m, 0.4 m, 0.6 m, 0.8 m, 1.2 m, 1.6 m, 2.0 m, 2.4 m, and 3.2 m. The subsetted versions of the files contain data from the 0.8 m and 3.2 m depths only. The complete version is more applicable to scientific investigation. The subset version is provided for K-12 teachers and is featured in the "How Permanent is Permafrost?" classroom activity.