The dataset consists of passive microwave measurements collected between 4 February and 12 February 2020 as part of the NASA SnowEx 2020 field campaign at the Grand Mesa, Colorado IOP study site. The measurements were taken at v- and h-polarization at both 19 and 37 GHz using two radiometers mounted on a sled. The radiometers measure emission of passive microwave radiation and record voltage for each radiometer. The voltage is converted to microwave brightness temperature using calibrations based on measurements of absorbers of known brightness temperature.