Sea ice drift and surface temperature were measured by the Compact Air-Launched Ice Beacon (CALIB) 2015C12 drifting on Arctic sea ice. The buoy was deployed on second year/multi year ice during MELTEX-II 2015 (Impact of sea ice thickness, sea ice topography and MELT ponds on the energy and momentum EXchange between atmosphere and sea ice). The time series describes the position and additional parameters of the buoy between 03 Jul 2015 and 31 Dec 2015 in sample intervals of 10 minutes. The data set has been processed, including the removal of obvious inconsistencies (missing values).