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, wind speed, water vapor flux, carbon dioxide, longwave and shortwave radiation, soil temperature, soil moisture, soil heat flux, precipitation, snow depth, and eddy correlation. Measurements were collected between 1 Dec 2001 and 27 March 2002, and between 20 November 2002 and 24 March 2003. Sensors were installed on 2-meter and 4-meter platforms.