Before 1990, standard measurements were recorded three times each day at 0730, 1400, and 1700 h. Since 1990, standard measurements have been recorded daily at 0800 h. These measurements included dry- and wet-bulb temperature, daily minimum and maximum air temperatures, and total radiation. The Climate Computer (CLICOM) system, developed under the World Meteorological Organization, was used as the main database-management tool, including comprehensive data entry, data validation, and data quality control. Historic weather data were imported into CLICOM, which became the basis of the station-specific limits for quality control of the incoming new data. For a given month, CLICOM checks each entry against global and station-specific set extreme value limits, against other related element values, and against the previous day's recorded value. Set value limits were derived from published reports of the Food and Agriculture Organization of the United Nations and the Philippine Atmospheric, Geophysical, and Astronomical Services Administration