The GPM Ground Validation Meteorological Tower Environment Canada GCPEx dataset provides temperature, relative humidity, 10 m winds, pressure and solar radiation data collected by a suite of standard meteorological instruments attached to a 10 m met tower. The GPM Cold-season Precipitation Experiment (GCPEx) addressed shortcomings in the GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. Data was gathered over the Ontario region of Canada in 2012 from January 15th through March 1st. Browse images are available online. The observation station was assembled by Automated Transportable Meteorological Observation Station (ATMOS).