SEATTLE UNIV OF WASHING, WASHINGTON

Monthly Total Heating Degree Days

(457478)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 198307
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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 66.72 a 46.00 58.00 169.50 398.50 609.50 820.00 2168.22
1949 1001.50 735.50 573.00 379.00 181.50 124.00 59.93 a 40.50 124.00 472.50 440.50 746.50 4878.43
1950 1163.50 665.50 665.50 509.50 376.50 120.00 29.50 25.50 135.50 397.00 584.00 584.35 a 5256.35
1951 812.50 634.50 717.50 378.10 a 254.00 74.50 13.00 32.50 105.00 368.50 574.00 824.50 4788.60
1952 834.50 646.50 637.00 421.00 259.00 156.50 g 44.43 a 39.50 96.00 265.50 657.00 686.65 a 4587.08
1953 589.50 588.00 570.40 a 481.00 257.50 178.00 12.00 34.00 127.50 318.00 493.00 677.00 4325.90
1954 853.50 601.00 624.13 a 481.00 285.56 e 180.00 95.50 78.50 136.00 354.00 399.00 638.00 4726.19
1955 754.85 a 679.26 a 726.00 536.00 363.50 175.50 83.50 67.00 152.50 343.77 c 750.00 a 792.05 a 5423.93
1956 781.20 a 801.00 695.00 415.00 182.50 183.00 23.50 21.00 105.50 374.30 d 564.50 660.50 4807.00
1957 904.00 662.50 572.00 379.00 127.50 42.50 f 0.00 z 0.00 z 20.00 i 244.50 g 542.50 575.57 a 3763.07
1958 38.00 z 424.50 578.67 a 397.50 127.10 a 47.78 c 1.60 b 10.52 c 93.00 g 312.98 e 432.00 h 0.00 z 1900.65
1959 707.32 a 632.33 d 581.25 a 393.50 299.00 145.00 26.50 f 52.18 a 193.45 a 376.00 612.00 722.50 4714.53
1960 781.00 637.50 620.50 416.50 335.00 121.50 27.00 95.07 a 185.00 336.83 e 586.55 a 301.00 r 4142.45
1961 522.50 f 613.00 625.74 d 0.00 z 87.00 s 68.00 i 11.50 q 2.00 k 109.00 k 445.92 e 616.80 e 319.00 q 2301.46
1962 787.63 d 588.50 440.50 k 378.75 b 353.00 113.00 j 75.50 f 30.00 k 69.50 k 323.36 b 495.00 d 635.50 a 3561.74
1963 891.50 444.50 577.38 c 413.79 a 235.00 171.67 c 99.64 c 50.63 a 86.54 d 260.00 f 571.00 710.23 c 4251.88
1964 0.00 z 0.00 z 607.08 a 487.00 336.00 162.93 a 0.00 z 0.00 z 188.50 352.00 506.50 i 849.00 2982.51
1965 764.50 607.00 570.50 409.00 336.50 115.50 34.00 49.50 185.00 266.50 455.00 734.50 4527.50
1966 736.50 605.00 601.40 a 414.50 275.50 137.50 61.00 29.50 78.00 355.00 541.50 595.50 4430.90
1967 677.00 586.00 661.50 527.00 270.00 65.00 15.00 6.00 38.50 312.50 525.50 751.00 4435.00
1968 772.50 530.50 507.50 476.00 248.00 138.00 27.00 55.50 153.50 383.00 545.50 854.00 4691.00
1969 994.00 656.50 574.00 445.50 210.50 57.00 54.00 64.00 144.00 378.00 546.00 644.00 4767.50
1970 736.00 507.00 580.00 514.00 299.50 97.00 47.50 48.50 205.71 b 406.00 543.50 782.00 4766.71
1971 760.00 637.50 705.00 467.50 287.00 215.50 77.50 4.50 160.00 423.00 554.00 833.00 5124.50
1972 874.00 664.50 549.00 528.00 229.50 142.00 43.50 18.50 205.00 398.00 533.50 820.50 5006.00
1973 785.50 560.50 564.00 421.50 245.00 171.00 58.00 97.00 110.50 361.50 643.50 630.50 4648.50
1974 800.00 616.00 608.50 473.28 a 353.00 132.50 63.00 35.50 53.50 316.50 529.00 648.50 4629.28
1975 753.50 655.50 649.00 543.00 273.50 165.00 33.00 89.00 100.50 372.50 580.00 694.00 4908.50
1976 677.00 656.00 673.00 425.00 262.00 195.00 39.50 78.00 89.50 328.00 515.00 657.50 4595.50
1977 813.50 492.50 624.00 343.00 323.50 86.50 58.50 36.50 158.00 365.00 632.50 688.50 4622.00
1978 662.00 514.00 483.50 408.00 261.00 33.50 f 33.58 a 33.00 148.50 284.50 697.50 778.10 a 4303.68
1979 601.50 j 478.50 j 439.00 433.27 d 164.50 67.50 0.00 z 7.00 m 30.52 a 257.50 574.00 606.50 2572.79
1980 868.52 a 572.00 565.00 298.00 214.42 a 145.56 c 20.50 40.50 89.00 263.00 504.00 613.50 4193.99
1981 613.05 b 585.67 d 437.50 406.07 b 247.00 141.00 39.04 d 2.50 108.50 395.50 506.00 715.50 4197.33
1982 799.50 604.00 591.50 462.00 235.00 57.50 51.00 22.50 92.50 317.00 622.50 750.00 4605.00
1983 619.00 476.00 491.50 352.50 155.00 98.00 31.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2223.50
Period of Record Statistics
MEAN 792.53 602.43 595.49 435.70 260.68 128.31 44.09 43.85 127.60 352.19 561.93 709.98 4711.11
S.D. 119.63 79.09 70.85 59.52 65.75 46.44 24.08 26.11 47.32 52.38 71.43 83.14 306.27
SKEW 0.91 -0.19 -0.30 0.03 -0.24 -0.17 0.56 0.41 -0.14 0.02 0.26 0.18 0.40
MAX 1163.50 801.00 726.00 543.00 376.50 215.50 99.64 97.00 205.71 472.50 750.00 854.00 5423.93
MIN 589.50 424.50 437.50 298.00 127.10 47.78 1.60 2.50 30.52 257.50 399.00 575.57 4193.99
NO YRS 31 33 34 34 34 31 30 30 31 33 33 32 23