ICE HARBOR DAM, WASHINGTON

Monthly Total Heating Degree Days

(453883)

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
1957 0.00 z 0.00 z 172.50 u 295.00 c 66.50 8.50 2.00 1.00 47.00 418.50 b 727.50 725.00 2291.00
1958 842.50 531.00 648.00 386.50 74.50 2.00 0.00 0.00 77.50 332.50 687.00 886.50 4468.00
1959 945.50 763.50 553.50 342.00 245.50 24.00 4.50 11.00 110.50 356.50 828.00 983.50 5168.00
1960 1274.50 762.50 613.00 333.50 208.50 25.00 0.00 21.00 57.00 291.00 636.00 1053.00 5275.00
1961 901.50 534.07 a 532.50 350.00 164.50 14.00 0.50 0.00 115.00 400.50 881.00 912.50 4806.07
1962 1039.50 755.00 690.27 a 258.62 a 230.00 47.00 8.00 5.00 59.50 330.00 583.50 816.50 4822.89
1963 1151.00 748.00 565.50 410.00 165.50 34.50 0.50 1.50 30.00 229.00 573.00 997.50 4906.00
1964 795.50 715.50 651.00 407.00 196.00 37.00 0.00 17.50 77.00 368.00 712.50 1045.00 5022.00
1965 903.00 641.00 694.00 269.50 174.00 32.50 4.00 16.00 106.00 221.50 561.00 907.00 4529.50
1966 858.50 708.00 562.50 321.50 128.00 54.00 12.50 2.50 20.50 310.50 579.50 750.00 4308.00
1967 670.50 576.00 594.00 459.50 169.00 17.50 0.00 0.00 12.50 262.50 673.00 890.00 4324.50
1968 860.00 651.00 485.50 420.00 130.00 27.50 0.00 3.50 57.50 384.50 659.50 970.50 4649.50
1969 1302.00 870.50 614.50 368.00 111.50 14.50 0.00 5.50 54.00 423.50 632.00 884.00 5280.00
1970 967.50 648.00 616.00 471.00 158.00 44.50 0.00 0.00 142.50 411.50 690.50 897.50 5047.00
1971 800.00 675.00 693.50 407.00 159.50 86.00 16.00 1.00 145.00 390.00 642.00 872.00 4887.00
1972 927.50 800.50 512.00 489.50 155.00 31.00 0.50 0.00 z 123.00 362.00 685.50 1095.00 5181.50
1973 1054.50 746.50 536.00 368.50 169.00 57.00 3.50 7.00 71.50 332.50 690.00 757.50 4793.50
1974 1103.50 598.50 576.00 381.50 233.00 34.00 9.00 0.00 42.00 357.00 584.50 740.00 4659.00
1975 901.00 810.00 665.50 509.00 205.50 61.50 0.00 5.50 67.00 325.00 673.97 a 849.50 5073.47
1976 845.00 730.00 674.00 433.50 160.50 96.00 4.50 10.50 32.00 374.00 699.50 969.50 5029.00
1977 1168.50 657.00 616.00 263.00 266.50 22.00 9.50 7.00 128.50 411.00 726.00 857.00 5132.00
1978 1009.50 714.00 559.55 a 399.00 244.50 33.50 0.50 17.57 a 91.50 392.50 894.00 1023.50 5379.62
1979 1439.78 d 802.00 601.00 390.50 0.00 z 43.00 0.00 z 0.00 29.50 235.50 788.79 a 796.18 a 5126.25
1980 0.00 z 0.00 z 641.00 317.50 174.50 80.00 1.50 13.00 50.00 394.73 a 618.50 809.00 3099.73
1981 821.00 701.50 541.00 375.50 186.00 80.00 16.50 0.00 92.59 a 412.62 b 623.50 891.00 4741.21
1982 1019.00 709.50 625.00 477.50 199.50 47.50 7.50 0.00 83.50 388.00 770.00 895.00 5222.00
1983 767.00 616.50 479.50 380.50 166.07 c 28.00 4.00 0.00 154.50 377.50 537.50 1230.50 4741.57
1984 952.00 720.00 521.50 401.00 0.00 z 82.50 2.00 2.00 152.50 429.50 708.50 1130.00 5101.50
1985 1161.00 904.50 633.50 298.50 142.50 31.50 0.00 0.00 z 169.00 387.50 0.00 z 1315.95 a 5043.95
1986 942.00 719.50 483.00 402.00 220.50 8.00 15.50 a 0.00 o 99.50 q 318.50 614.00 967.00 4690.00
1987 1027.00 696.00 531.00 254.50 100.00 30.50 6.00 0.00 44.00 341.00 593.50 940.00 4563.50
1988 979.50 712.50 568.50 320.00 180.00 76.50 4.50 0.00 101.00 206.00 543.50 958.00 4650.00
1989 817.50 1064.00 646.00 307.00 178.50 12.00 0.00 3.00 35.50 346.50 568.00 923.00 4901.00
1990 765.50 756.00 396.50 j 252.00 179.50 52.00 5.00 0.00 4.00 379.50 534.50 1171.50 4099.50
1991 1085.00 579.50 654.00 366.00 211.00 82.50 0.00 0.00 0.00 z 353.00 666.00 802.50 4799.50
1992 792.50 635.00 0.00 z 269.00 107.00 20.50 6.00 22.00 130.50 344.00 669.50 970.50 3966.50
1993 1264.50 973.00 490.50 k 354.50 101.00 0.00 z 3.00 14.50 79.00 279.00 828.50 849.50 4746.50
1994 769.00 794.50 519.50 258.00 0.00 z 40.00 0.50 0.00 7.50 344.50 692.50 857.00 4283.00
1995 955.00 612.50 601.50 382.50 150.50 61.00 0.50 5.50 44.50 397.50 570.00 907.50 4688.50
1996 974.50 946.50 622.50 332.50 240.50 31.00 1.00 0.00 110.50 359.50 700.50 1011.50 5330.50
1997 944.00 702.00 545.50 413.50 132.00 29.50 0.00 0.00 48.50 355.50 640.00 846.00 4656.50
1998 862.00 621.00 536.00 374.00 169.50 9.50 0.00 1.00 19.00 389.00 521.00 893.50 4395.50
1999 738.00 610.00 584.00 439.50 261.50 61.50 11.00 12.00 92.50 390.00 535.50 735.00 4470.50
2000 859.50 742.50 580.50 293.50 155.00 51.72 a 3.50 4.50 110.50 390.50 834.00 993.50 5019.22
2001 956.00 790.50 556.00 412.00 162.50 73.00 1.07 b 1.03 a 33.50 371.00 601.55 a 807.11 c 4765.26
2002 820.00 726.00 684.00 364.50 247.00 47.50 4.50 8.00 73.00 421.50 672.50 761.00 4829.50
2003 748.00 686.50 450.50 342.00 194.50 17.50 0.00 0.00 45.00 220.50 755.00 870.00 4329.50
2004 1070.50 770.50 452.00 291.50 120.50 53.50 0.00 0.00 50.50 281.00 667.00 823.00 4580.00
2005 994.50 755.00 478.00 0.00 z 108.50 34.50 0.00 0.00 67.50 276.50 679.50 1038.50 4432.50
2006 482.00 i 788.50 597.50 358.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1744.00
Period of Record Statistics
MEAN 954.15 724.40 582.29 362.67 171.81 41.42 3.52 4.77 74.36 348.45 665.68 919.91 4817.90
S.D. 164.33 107.18 66.38 65.75 48.74 23.76 4.61 6.39 42.66 59.10 91.72 127.37 300.35
SKEW 0.83 0.82 -0.14 0.10 -0.02 0.50 1.46 1.29 0.41 -0.89 0.61 0.91 0.10
MAX 1439.78 1064.00 694.00 509.00 266.50 96.00 16.50 22.00 169.00 429.50 894.00 1315.95 5379.62
MIN 670.50 531.00 450.50 252.00 66.50 2.00 0.00 0.00 4.00 206.00 521.00 725.00 4308.00
NO YRS 47 48 46 49 46 48 48 46 47 49 48 49 36