| National Climatic Data Center (NCDC): The world's largest active archive of weather data. NCDC produces numerous climate publications and responds to data requests from all over the world. |
| Clear Sky Clock homepage: Weather predictions specifically for astronomers for hundreds of observatories, observing sites and clubs in the USA and Canada. |
| Climate Diagnostics Center: The mission of CDC is to identify the nature and causes of climate variations on time scales ranging from a month to centuries. |
| Climate Prediction Center: The National Weather Service agency that maintains a continuous watch on short term climate fluctuations and diagnoses and predicts them. |
| Climate Prediction Products: 6 to10 day, monthly, seasonal and multi-seasonal outlooks from the Climate Prediction Center. |
| Daily 30-day Long Range Weather Forecasts: free long range weataher forecasts to help you plan your weather sensitive activities and events. |
| Experimental Climate Prediction Center: Information and long term predictions from the climate division of the Scripps Institution of Oceanography at the University of California, San Diego. |
| Experimental Medium-Range Weather Forecasts: Forecasts of anomalous 250 and 750 mb streamfunction out as far as six weeks ahead, using the statistical technique linear inverse modeling. |
| Flagstaff USGS -- Deserts: Desert climate research at the US Geological Survey Flagstaff Field Center, Arizona. |
| High Plains Climate Center: University of Nebraska offering reports and data on regional climate research. |
| Hydrometeorological Prediction Center: Providing outlooks for heavy rain and snow, as well as guidance weather forecasts through five days. |
| International Research Institute for Climate Prediction: Assessing and developing seasonal-to-interannual climate forecasts, while fostering the application of such forecasts to the explicit benefit of society. |
| Long-Range Weather Forecasts: Long-range weather forecasts from Harris-Mann Climatology, including a U.S. Climate Timeline. |
| National Centers for Environmental Prediction: The U.S. National Weather Service office that provides worldwide forecast guidance products. |
| North Atlantic Oscillation: Data Analysis: North Atlantic Oscillation and its relevance to climate variability and predictability. Includes information on air-sea and air-land interactions, model results, and satellite data. |
| Ocean Prediction Center: The section of NCEP responsible for issuing marine warnings, forecasts and guidance for maritime users. |
| PreDiCate: Atlantic-European Climate Group, Department of Meteorology, University of Reading. Mechanisms and predictability of decadal climate fluctuations. |
| RHEA forecasts the wet-weather risks: RHEA provide consulting services and skills in urban hydrology, water pollution control, automatic controls and atmospheric physics. |
| Seasonal Forecasts of Extreme Weather Events: Seasonal forecasts of European Windstorms, US Hurricanes, Far East Typhoons and Australian Cyclone. Statistical forecast techniques are employed. |
| Space Environment Center: Providing space weather alerts and warnings to the nation and the world for disturbances that can affect people and equipment working in space and on Earth. |
| Storm Prediction Center: Official government site for the prediction of thunderstorms and severe weather in the U.S. |
| Tropical Prediction Center: National Hurricane Center site providing detailed location and forecasting of tropical storms and hurricanes |
| U.S. Historical Climatology Network (U.S. HCN): Best available historical (monthly) temperature and precipitation data from the United States for analyzing long-term climate trends on a regional scale. Data for most stations extend through December, 1994, and a majority of the station records are complete for at least 80 years. |
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