Stations are grouped alphabetically by state with postal abbreviation information on each period of record following chronologically. Positive latitude is north of the equator.
West longitudes are less than zero.
Station elevation is given in meters above mean sea level. The NCDC stopped digitizing navy data on an hourly basis after February 1972. A break in the period of record also occurs if the observation frequency at the stations changed. F Less than 3 Blank Unknown Periods of record were most often interrupted by changes in anemometer height or location. Changery's index documents these changes and gives an anemometer height and location history for each station.