SEATTLE TCOMA WSCMO AP, WASHINGTON

Monthly Total Heating Degree Days

(457473)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 200603
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
Months with 5 missing days or less use mean for missing day(s)
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1931 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1932 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1933 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1934 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1935 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1936 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1937 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1938 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1939 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1940 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1941 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1942 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1943 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1944 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1945 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1946 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1947 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 108.50 f 101.50 122.00 245.50 452.50 688.50 899.50 2509.50
1949 1087.00 775.50 603.00 447.50 239.00 184.50 100.00 64.00 157.50 509.50 468.00 825.50 5461.00
1950 1244.50 700.50 711.50 559.50 414.50 164.50 59.50 67.00 225.00 491.00 642.50 627.00 5907.00
1951 870.50 698.50 795.50 464.00 335.50 140.50 58.00 112.50 190.50 442.00 637.50 885.50 5630.50
1952 886.50 706.50 703.00 496.50 341.00 255.50 85.00 102.50 185.50 333.00 719.00 724.50 5538.50
1953 642.00 695.00 683.50 546.50 391.00 286.00 112.50 82.00 165.50 367.00 550.00 705.00 5226.00
1954 897.50 638.50 754.00 583.50 345.00 261.50 155.00 139.50 189.50 447.50 481.50 752.50 5645.50
1955 802.00 750.50 802.50 613.50 444.50 230.00 159.00 133.50 249.50 454.00 784.00 826.50 6249.50
1956 807.00 851.50 749.50 462.00 267.50 245.00 73.50 93.00 216.00 482.00 671.50 768.00 5686.50
1957 1005.00 714.00 638.50 446.50 220.50 140.50 103.50 105.00 79.50 443.50 646.00 662.50 5205.00
1958 663.00 490.00 651.00 474.50 169.50 85.50 15.50 21.00 170.50 345.00 647.00 624.50 4357.00
1959 751.00 673.00 646.00 463.00 361.00 173.00 61.00 95.50 227.50 403.50 633.50 767.00 5255.00
1960 810.00 690.50 667.00 473.00 382.00 170.00 44.00 133.50 215.00 382.50 615.00 791.50 5374.00
1961 663.00 577.00 613.00 539.00 351.00 99.00 26.00 9.50 204.00 442.00 694.50 796.00 5014.00
1962 825.50 615.00 673.00 452.00 446.00 171.50 101.50 105.50 166.50 386.00 556.50 705.50 5204.50
1963 964.00 471.00 658.50 501.50 260.00 177.50 85.50 42.00 78.00 329.00 617.50 752.00 4936.50
1964 777.00 687.00 648.00 545.50 375.50 212.50 84.00 96.00 195.50 357.00 688.50 887.50 5554.00
1965 769.00 618.00 559.50 466.50 407.50 141.00 26.50 46.50 201.00 266.50 467.50 762.00 4731.50
1966 741.50 590.50 616.50 451.50 327.00 197.50 102.50 57.00 112.50 421.50 589.50 666.50 4874.00
1967 702.50 621.50 709.50 554.50 300.00 97.00 18.50 0.50 47.00 317.50 531.50 727.00 4627.00
1968 746.50 479.50 509.00 491.50 240.00 145.50 36.00 76.00 185.00 421.00 545.00 880.00 4755.00
1969 989.00 635.50 561.50 484.00 234.50 74.50 52.50 53.50 148.50 389.50 553.50 614.00 4790.50
1970 738.00 505.00 590.50 568.00 321.00 127.00 58.00 48.50 197.00 442.00 555.50 808.00 4958.50
1971 785.50 635.50 734.50 482.50 329.50 275.50 86.50 17.50 223.00 436.00 578.50 852.50 5437.00
1972 870.00 685.50 563.50 539.50 227.50 151.50 50.50 34.50 301.00 463.00 549.00 834.50 5270.00
1973 814.50 591.50 647.50 492.00 280.00 189.00 74.00 121.50 115.50 397.00 639.00 639.50 5001.00
1974 815.50 612.00 580.00 440.50 314.50 104.00 68.00 71.00 77.50 387.50 597.50 700.00 4768.00
1975 814.50 678.00 686.00 576.00 323.50 150.00 25.50 81.00 97.50 421.00 603.00 729.00 5185.00
1976 721.00 699.00 737.50 471.50 271.50 163.50 27.00 55.50 86.50 314.50 517.50 630.00 4695.00
1977 793.50 457.50 598.50 343.50 327.00 85.00 38.00 46.50 186.00 397.50 634.50 709.00 4616.50
1978 640.00 532.00 507.50 453.00 329.50 84.50 46.00 47.50 186.00 332.00 714.00 854.00 4726.00
1979 843.00 637.00 486.00 426.00 244.00 100.50 29.00 45.00 91.00 335.50 634.00 649.00 4520.00
1980 935.00 616.00 642.50 402.50 334.50 226.50 70.50 109.50 164.50 348.50 550.00 649.50 5049.50
1981 640.00 583.00 502.50 463.00 320.50 228.00 86.50 30.50 142.00 437.00 536.50 723.50 4693.00
1982 797.00 642.00 649.50 528.50 321.00 106.50 97.50 48.00 146.00 381.00 654.50 752.50 5124.00
1983 622.50 506.50 486.00 429.50 250.50 155.00 76.50 20.00 202.50 414.50 518.00 895.50 4577.00
1984 677.00 585.50 512.00 489.00 377.00 190.50 59.00 44.50 164.00 475.50 611.00 875.00 5060.00
1985 865.00 728.50 673.50 476.00 317.00 165.00 9.00 52.00 207.00 423.00 876.50 894.50 5687.00
1986 624.50 622.50 489.00 507.50 309.50 96.50 111.00 13.50 203.00 331.00 592.00 715.00 4615.00
1987 761.00 525.50 498.00 391.50 260.50 113.00 61.00 40.50 107.00 292.00 494.00 799.50 4343.50
1988 773.50 597.00 601.00 441.50 322.00 171.50 64.00 43.00 169.00 298.50 589.00 716.50 4786.50
1989 758.50 815.50 660.50 347.50 281.50 97.50 45.50 33.50 73.00 370.00 542.00 686.00 4711.00
1990 697.50 702.00 555.00 387.50 321.00 164.00 31.00 25.00 68.50 429.00 554.50 922.50 4857.50
1991 776.50 484.50 647.00 478.50 331.50 185.00 26.50 42.50 96.50 376.00 531.00 660.50 4636.00
1992 654.00 514.50 455.50 357.00 177.50 69.00 28.50 25.50 158.50 330.00 586.50 813.00 4169.50
1993 841.50 636.00 523.50 434.50 175.50 141.00 120.50 53.00 125.00 298.50 691.00 731.50 4771.50
1994 624.50 689.00 511.00 381.00 213.00 138.50 25.50 6.00 46.50 378.50 679.50 721.00 4414.00
1995 578.00 534.50 533.50 397.50 164.00 121.50 22.00 82.00 63.00 389.00 477.50 701.00 4063.50
1996 785.50 634.50 550.50 406.00 370.00 139.00 45.00 33.50 174.50 430.00 656.00 798.50 5023.00
1997 742.00 647.00 628.00 475.50 215.50 167.50 43.00 12.50 100.00 425.00 497.50 729.00 4682.50
1998 708.00 540.00 571.00 441.00 316.50 160.00 23.50 23.50 83.50 384.00 550.00 778.00 4579.00
1999 714.50 630.00 642.50 495.00 408.50 223.00 107.00 45.00 146.00 399.00 513.00 714.50 5038.00
2000 767.00 618.00 637.00 423.50 346.50 160.00 64.00 72.50 152.50 378.50 676.50 753.00 5049.00
2001 713.50 681.50 608.00 511.50 309.50 225.00 92.50 49.00 157.50 437.50 550.00 729.00 5064.50
2002 752.50 648.50 717.50 487.50 371.50 149.50 60.50 50.50 138.50 422.00 539.00 682.50 5020.00
2003 597.50 655.00 564.50 483.50 317.50 120.50 18.50 13.50 112.50 334.00 665.50 721.50 4604.00
2004 767.00 595.50 539.50 351.50 249.50 100.00 25.00 20.00 185.00 363.00 601.00 698.00 4495.00
2005 710.00 628.00 494.50 427.50 226.50 157.50 38.50 18.50 168.00 341.50 663.00 693.50 4567.00
2006 571.50 618.50 604.50 441.00 258.00 98.00 26.50 j 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2591.50
Period of Record Statistics
MEAN 774.73 627.43 613.49 468.35 304.94 157.79 62.34 57.47 154.66 391.30 600.78 751.90 4962.81
S.D. 123.69 83.89 84.52 60.50 67.76 53.01 34.94 36.23 56.30 54.66 80.27 81.02 440.45
SKEW 1.19 0.06 0.16 0.06 -0.14 0.47 0.67 0.61 -0.04 -0.12 0.71 0.37 0.55
MAX 1244.50 851.50 802.50 613.50 446.00 286.00 159.00 139.50 301.00 509.50 876.50 922.50 6249.50
MIN 571.50 457.50 455.50 343.50 164.00 69.00 9.00 0.50 46.50 266.50 467.50 614.00 4063.50
NO YRS 58 58 58 58 58 58 58 58 58 58 58 58 57