MONTHLY DEGREE DAY RECORD_ 1998-2001 Seattle-Tacoma by xiangpeng

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									                                                   MONTHLY DEGREE DAY RECORD, 1998-2001
                                                        Seattle-Tacoma Airport Station

                  Normals Based on                                                                                       Normals Based on
                     1951-1980                      1998                     1999                      2000                 1961-1990              2001
                    Year Records                                                                                           Year Records
                  Normal     % of                        % of                      % of                     % of         Normal     % of               % of
      Month       HDD       Annual           HDD        Normal        HDD         Normal        HDD        Normal        HDD       Annual   HDD       Normal
        JAN           803        16%         702           87%         707          88%         760           95%           772     16%     707           92%
        FEB          6221        12%         533           86%         622          100%        611           95%          6022     12%     673           112%
       MAR            645        13%         562           87%         634          98%         628           97%           601     12%     599           100%
        APR           489        10%         433           89%         484          99%         415           85%           474     10%     508           107%
       MAY            313         6%         307           96%         400          128%        340           110%          307      6%     308           100%
        JUN           169         3%         151           89%         218          130%        155           92%           144      3%     218           151%
        JUL            76         1%          22           29%         101          133%         60           79%           58       1%      86           148%
        AUG            97         2%          21           22%          42          43%          64           66%           65       1%      44           68%
        SEP           169         3%          79           46%         141          83%         145           86%           156      3%     150           96%
        OCT           388         8%         376           96%         393          101%        379           98%           378      8%     430           114%
        NOV           606        12%         543           89%         504          83%         668           110%          591     12%     547           93%
        DEC           744        14%         772           103%        706          95%         745           100%          760     16%     723           95%


     TOTALS       5,1211        100%         4501          88%        4952          97%         4970          97%        4,9082    100%     4993          102%
NOTE: Prior to January 2001, normals used were based on 1951-1980 year records for Seattle-Tacoma, which became available 5/85.
Effective January 2001, normals used are based on the 1961-1990 year records for Seattle-Tacoma, which became available 1/93.
1
    644 Heating Degree Days are normal for February with 29 days; 5143 Heating Degree Days are normal for a Leap Year.
2
    622 Heating Degree Days are normal for February with 29 days; 4928 Heating Degree Days are normal for a Leap Year.

								
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