u can contact the local meteorological department and Agromet field unit of the university..under GKMS.IMD has automatic westher stations and ome week data is availbe on its site imd,/aws..but archives not available.
It is not clear whether you want NWP model data or synoptic observational data.
Depending upon your requirements you may try links as already suggested by other learned scientists and also you may try ogimet.com for observational data; NCEP of ECMWF sites for model data.
I am not sure what type of data you are looking for. But based upon your question I think the Radiosonde data is most authentic and suitable. You can download the worldwide weather data from the link below,
Ihab Hijazi Select the region year month duration then just click on your desired station link over the map (note: not many stations are available outside US region and available over airports, so you need to choose accordingly), then a separate page will open. You have to copy it from there.