This data set presents various climate data from sites in Barrow and Atquasuk, on the Northern Slope of Alaska. Parameters include thaw depth, air temperature, precipitation, wind speed, light intensity, plant canopy temperature, soil temperature, soil moisture, soil salinity, and relative humidity. Data were collected between June 1995 and August 2001 by various sensors connected to data loggers. Air and soil temperatures are given in degrees Celsius and wind speed is measured in meters per second. All other parameter measurements are detailed in the documentation. The research project was funded by the Arctic System Sciences (ARCSS) Program, grant number OPP 9714103.