Global Summary of the Day is a digital data set archived at the National Climatic Data Center (NCDC). Four files are included in this product. These files contain summarized data which have been extracted from surface synoptic weather observations, exchanged on the Global Telecommunications Systems (GTS). The National Centers for Environmental Prediction (part of the U.S. National Weather Service) ... collect and process this GTS data and provide it to the NCDC for archival. FILE 1 - Header file which explains the contents of the four files. FILE 2 - Daily summarized values of maximum temperature, minimum temperature and precipitation for each reporting station for one month. FILE 3 - Monthly summary of up to 31 daily summary files. Average temperatures have been computed from the daily maxima and minima for each station. The highest and lowest temperatures reported during lowest temperatures reported during the month and their dates, the total accumulated precipitation for the month, and the number of reports with present or past weather codes indicating the occurrence of precipitation are also saved. FILE 4 - Station library consisting of the location identifier, latitude, longitude, elevation, country number, region number, quality indicator, call letters, station name and country name.