GSOD is a collection of daily weather measurements (temperature, wind speed, humidity, pressure, and more) from 9000+ weather stations around the world.
Currently updated infrequently. Last updated on September 13, 2016.
The data is intended for free and unrestricted use in research, education, and other non-commercial activities. Per World Meteorological Organization (WMO) Resolution 40, redistribution of these data by others must provide this same notification, and non-U.S. data cannot be redistributed for commercial purposes.