http://www.blueplanetbiomes.org/climate.htm
http://www.weather.gov/climate/
http://en.wikipedia.org/wiki/Climate#National_and_regional_climates
http://encarta.msn.com/media_461544522/United_States_Climate_Regions.html
http://www.physicalgeography.net/fundamentals/7v.html
http://www.geocities.com/slauson6th/worldclimateregions.htm
http://www.metoffice.gov.uk/education/data/climate/index.html
http://www.worldbookonline.com/wb/Students?content_spotlight/climates/about_climates