NCDC TD14 and TD3280 U.S. Surface Airway Hourly Observations, 1938(1948)-2005

The stations are operated by the National Weather Service (NWS), the Federal Aviation Administration (FAA), the U.S. Air Force (Air Weather Service), and the U.S. Navy (Navy Weather Detachment). The NWS and FAA sites are located in the contiguous U.S., Alaska, Puerto Rico, Hawaii and other Pacific Islands.

The Air Force and Navy operate stations worldwide; however, only a few are included in this set. The observations are generally recorded midnight to midnight for the 24-hour period. The major data parameters are clouds, visibility, wind, temperature, sky cover, relative humidity, pressure, and descriptive weather.