This data set presents micrometeorological data from the Flux over Snow Surfaces (FLOSS) project carried out during the Cold Land Processes Field Experiment (CLPX) at North Park, Colorado, USA. The project measured air temperature, air pressure, relative humidity, water vapor, cloud particles, carbon dioxide, longwave and shortwave radiation, and precipitation. Measurements were collected between November 2002 and March 2003. Sensors were installed on a Raytheon King Air 200T, which flew at low atlitude over the study area.