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How do I find relevant web sites?
Google is not a bad idea! However, you must be mindful of the fact that the first hit on a Google search may not be the best resource for your research. Look for websites that are authored by people who should know something about the topic. Look for websites that are recent or recently updated. Below are some suggestions!
National Centers for Environmental Information
Formerly the National Climatic Data Center, they are the major repository for climate data in the US. Click "product" under "select data by" and then choose CLIMVIS. You can download and plot time series of station data from here. You can also plot maps of a particular variable for one time. A complete list of all surface data is available including access to the raw daily data. Station data that is more up-to-date can be found on the Global summary of the day page.
American Association of State Climatologists Climate Services Catalog
Scroll down the page and narrow results by region to see all the reports available!
National Weather Service
They have links to the webpages of many of their local offices. These vary widely in what they provide and are worth checking out.
Easy access to climate data, products and services.
Regional Climate Centers
The Regional Climate Center (RCC) Program provides climate services to six regions encompassing the United States.