Weatherbase
Monthly weather records, averages, historical weather and climatology for 16,434 cities worldwide.
http://www.weatherbase.com/

About.com -- Weather
The starting place for exploring weather including weather forecasts, and climate conditions, breaking weather news and headlines, and topical and informational articles.
http://weather.about.com/

Westwind.ch
6000 weather links for Europe
http://www.westwind.ch

Yahoo Weather
Yahoo weather including forecasts, resources and categories.
http://weather.yahoo.com/

Weather Forecasts: On The Net
Features forecasts, reports, and conditions around the world.
http://www.advocacy-net.com/forecastmks.htm

Americas Weather
Weather forecasts and current conditions for every U.S city and Canada, severe weather map showing current watches and warnings get complete state weather information for all 50 states
http://www.americasweather.com

Top 20 Weather
The top 20 weather sites, including subdirectories.
http://www.top20weather.com

Weather and Related Phenomena
Conditions, forecasts, warnings, radar and satellite images for land and sea on web sites around the world.
http://www.highfiber.com/~jrssmith/

WorldSwitch
Links to weather sites both in the U.S. and 80 International countries.
http://www.worldswitch.com/International/Weather.html

Science of the Sky
The art and science of weather and atmospheric phenomena.
http://www.suite101.com/welcome.cfm/science_sky

Weather Network
Enter the current weather conditions for your area, view other users data, web cams, photos and forecasts from the NWS. Weather forums also available.
http://www.weathernetwork.org

Weather Resources
Numerous links to weather information from refdesk.com.
http://www.refdesk.com/weath1.html

Freese-Notis Weather
Source of weather information for agriculture, aviation, commodities, construction, energy, forensic, internet, media, specialty, and transportation with complete meteorological knowledge and experience to receive current conditions with qualified forecasting and NEXRAD radar imagery via InterRAD.
http://www.weather.net/fn/newhoo.weather.html