Daily GRIDMET data are available for the contiguous U.S. for January 1, 1979 to the present.
The data contain maximum and minimum temperature (°C), precipitation (mm), solar radiation (MJ/m2/day), maximum and minimum relative humidity (%), specfic humidity (g/kg), and average wind speed (m/s).
The output is formatted as XML to be used in the SALUS model.
Source: University of Idaho Climatology Lab
Citation: Abatzoglou, J. T. (2013), Development of gridded surface meteorological data for ecological applications and modelling. Int. J. Climatol., 33: 121–131.