need daily gridded wind speed and solar radiation data on daily scale to run a hydrological model (SWAT model). Where can I can get data over global domain or over India? What are the reliable and free sources where I can get those data?
You can download global GFS data via this address: https://nomads.ncdc.noaa.gov/data/gfsanl/ Its GRIB files, maybe you need GDAL to convert it to GeoTIFF or NetCDF. And the list of data is in here: http://www.nco.ncep.noaa.gov/pmb/products/gfs/gfs.t00z.pgrb2.0p25.anl.shtml