Meteorological data consist of air temperature and relative humidity, wind speed and radiation (upwelling and downwelling shortwave and longwave, measured with a CNR4 radiometer and pyrgeometer with a CNF4 heater/ventilator). Snow data consist of snow height, snow thermal conductivity and snow temperature at several heights. Soil data consist of soil temperature and liquid water content at several depths. Snow thermal conductivity is measured with TP08 heated needle probes from Hukseflux as detailed in Domine et al. (2015), The Cryosphere, 9, 1265. Soil data were obtained with 5TM sensors from Decagon.