World Climate Data
- Weather rainfall and temperature data with long-term monthly averages for over 20,000 weather stations worldwide.
- http://www.worldclimate.com/

NCDC: Get/View OnLine Climate Data
- Repository of U.S. weather observations and climate data, including maps, models, links and publications.
- http://lwf.ncdc.noaa.gov/oa/climate/climatedata.html

Climate and Radiation
- From the NASA/Goddard Space Flight Center. Includes information about aerosols, clouds, rainfall, remote sensing, current projects, publications and personnel.
- http://climate.gsfc.nasa.gov/