| Daily normals and precipitation probabilities - :14829 | National Environmental Satellite and Data Information Service (NESDIS)
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  • Description:
    "The No. 84 series of climatic surmnaries provides climatic data from 422 National Weather Service Offices and Principal Climatological Stations across the United States and its territories. The data include daily normals for each day of the year. A normal describes the average climate over a long time period. It was decided by international agreements that the appropriate time period would be three consecutive decades. There have been several issues of the No. 84 series, each covering a different normals period. Daily normals for the 1921-50 and 1931-60 periods included maximum, minimum, and average temperature. Heating and cooling degree day normals were added with the 1941-70 issue. Precipitation normals were added with the 1951-80 issue. The 1961-90 issue includes two sets of tables: (i) the daily normals for maximum, minimum, and average temperature; heating and cooling degree days; and precipitation; and (ii) precipitation probabilities and quintiles. The daily normal values presented in the first set of tables are not simple means of the observed daily values. They are interpolated from the monthly normals by use of the cubic spline function as described by Greville [l]. The series of daily values resulting from the cubic spline yields a smooth curve throughout the year that represents the annual cycle of the climatological element for a station"--Page [1].

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