If your application is in India, you can use the free NREL database, which is certainly better and at higher resolution than NASA SSE. It provides global irradiance data--not net radiation though.

http://www.nrel.gov/international/ra_india.html

For sunshine, you would need to search the WRDC database for a nearby station.

http://wrdc-mgo.nrel.gov/

http://wrdc.mgo.rssi.ru/

You can go to HOMER's home page and will get direction on how to get solar radiation from NASA's website. You can specify the latitude and longitude and get archived data of Total Global Solar Radiation

You can get the weather data files in the following link-

http://apps1.eere.energy.gov/buildings/energyplus/weatherdata_about.cfm

US department of Energy database

If you want to create a data for a specific location, best way is to take measurements. Typical Meteorological Year (TMY) data is obtained from these measurements. For certain locations, TMY data is available and released in NREL's website. (http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3/) 

If there is no available data, you can create a data using Meteonorm software. As well as I know the software uses the existent TMY data and principles of solar energy utilization theory .

http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3/

hi, you can get it from NASA SSE web site for any location using Longitude and latitude. its with 1*1 degree grid data from 1983 to 2005. this is satellite data and you can have measured data from some other sites.

the best satellite data is ERA-interim data which you download for any location but you have to analyze it for the selected location.

if you want to use data with any simulation program you have to get is from Meteonorm.

If your application is in India, you can use the free NREL database, which is certainly better and at higher resolution than NASA SSE. It provides global irradiance data--not net radiation though.

http://www.nrel.gov/international/ra_india.html

For sunshine, you would need to search the WRDC database for a nearby station.

http://wrdc-mgo.nrel.gov/

http://wrdc.mgo.rssi.ru/

Hi, you can find these data in several Softwares, namely Homer or PVSyst 

Hi, you can find in US department of Energy database :):)

Data set is available from

NASA : https://eosweb.larc.nasa.gov/cgi-bin/sse/[email protected]+s01#s01

or http://power.larc.nasa.gov/

otherwise from Meteonorm : http://www.meteonorm.com/

NIWE: http://niwe.res.in/department_srra.php

HOMER software can be used for NASA data.

Marcin:

Note that the  DOE database, which has recently moved to this new site: https://energyplus.net/weather 

This provides consttructed TMY data files, not real observations. So this might not be what you need...

you can get from lot of source...particularly y can get data from MNRE website

You might also check IRENA Global Atlas http://irena.masdar.ac.ae/ and Meteonorm a woldwide database for relatively small money http://www.meteonorm.com/en/

And not forget SolarGIS / GeoModel http://geomodelsolar.eu/ a bit more expensive but very good data.

Good luck

You could use the following:

http://lawr.ucdavis.edu/classes/ers105/LABS/lab5/lab5_1/lab5.1.html#getdata

@Mohamad:

This webtool calculates TOA, so not useful here...

you can use the Meteonorm program follows this link  http://www.meteonorm.com

nice reply Beem

For indian conditions MNRE provides the data based on lat long of the place.

You can check from this link 

http://mnre.gov.in/sec/solar-assmnt.htm