Temperature and heating-induced temperature difference profiles were measured through the atmosphere, sea ice, and ocean using a SIMBA-type sea ice mass balance buoy equipped with a several meter long thermistor chain. The present dataset was recorded by SIMBA 2015T20 (original name Awi_62) installed on drifting sea ice in the Central Arctic Ocean during the expedition Polarstern PS94 (ARK29/3,TransArcII) in 2015. Data is available between 2015-09-25 09:00:00 and 2016-03-22 18:03:00. The thermistor chain was Variable 5 m long and included 240 sensors with a regular spacing of 2 cm. The resulting time series includes the evolution of temperature and temperature differences at 30 s and 120 s during a heating cycle of 120 s as a function of location, depth and time. The sampling intervals were usually between hourly and daily, but were most frequently configured to 6 hours for temperature, and 24 hours for temperature differences. In addition to temperatures and geographic location were measured. The present dataset was processed as follows: obvious inconsistencies (missing values) and unrealistic values of GPS position have been removed. This instrument was deployed as part of the project FRontiers in Arctic marine Monitoring (FRAM)Sea Ice Physics @ AWI (AWI_SeaIce).