The National Oceanic and Atmospheric Administration is an agency of the U.S. Deprtment of Commerce. It is the most comprehensive authority on weather conditions in the world. The National Institute Of Technology's  Time and Frequency Division, part of NIST's Physics Laboratory, maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology. Provided by the US Naval Observatory, this great site helps you get complete sun and moon data for one day. Oxford Weather. This link is a great source for definitions of weather terminology. This is a great link for definitons of weather parameters. Home