Twelve radiosondes were launched as part of the MAPM campaign during two 24-hour periods that were chosen based on their meteorological conditions. The balloons carrying GRAW DFM-9 radiosondes were launched from Ilam Fields in Christchurch. Each of the launch episodes started at 2pm in the afternoon (NZST) and radiosonde launches were performed every four hours to sample the diurnal cycle of the boundary layer. The collected data are available as one file per radiosonde ascent.