SEATTLE UNIV OF WASH, WASHINGTON

Monthly Total Heating Degree Days

(457478)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** 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
1909 1037.95 c 670.50 682.00 529.14 a 398.57 c 174.00 133.50 110.57 a 157.00 397.00 606.00 927.50 5823.72
1910 873.50 788.67 a 555.50 494.46 b 267.00 237.00 122.00 191.00 193.50 g 451.50 679.50 724.00 5384.13
1911 873.50 738.64 c 621.00 563.50 400.00 255.00 110.00 167.00 259.50 220.00 o 632.50 771.00 5391.64
1912 742.00 644.50 674.00 484.50 257.00 183.50 78.00 149.00 180.00 447.00 562.00 721.00 5122.50
1913 863.50 699.50 724.00 488.50 363.00 155.50 110.00 68.50 163.00 435.00 576.50 665.00 f 4647.00
1914 611.00 689.50 695.20 d 437.07 a 240.52 b 218.08 d 0.00 z 101.27 a 272.50 328.00 446.38 a 0.00 z 4039.51
1915 589.00 h 551.00 472.00 346.00 282.58 e 145.50 76.00 26.00 210.50 373.50 699.00 661.00 3843.08
1916 1033.50 693.00 677.00 501.00 429.50 195.50 127.50 89.00 213.50 477.50 650.00 837.00 5924.00
1917 822.50 709.00 707.50 551.00 383.50 232.50 88.00 45.50 190.50 402.50 519.50 714.50 5366.50
1918 744.00 805.00 730.50 477.00 0.00 z 129.00 92.50 81.00 122.50 362.00 606.50 763.00 4913.00
1919 727.50 640.00 575.50 387.00 291.50 0.00 z 0.00 z 0.00 z 155.17 a 514.94 d 711.50 975.50 4978.62
1920 995.10 a 1006.00 888.50 846.50 638.00 280.00 h 156.00 182.00 336.50 0.00 z 634.00 643.50 6326.10
1921 553.50 g 596.50 618.50 504.50 331.00 115.50 114.50 78.00 212.00 355.00 553.00 778.00 4256.50
1922 887.00 718.00 708.50 515.00 303.00 99.00 78.50 68.50 127.50 324.00 616.50 828.00 5273.50
1923 749.74 d 766.00 639.00 397.50 314.00 146.50 36.50 32.03 a 127.50 b 314.13 a 509.50 689.50 4721.91
1924 764.67 a 519.50 619.50 466.00 237.31 b 142.00 89.90 a 72.00 146.50 356.50 603.00 863.50 4880.38
1925 693.50 554.00 613.50 399.00 208.00 146.50 42.00 96.00 151.50 417.00 584.00 598.50 4503.50
1926 737.50 532.50 490.00 290.50 266.00 106.00 39.50 62.00 219.00 323.50 481.50 749.00 4297.00
1927 777.50 613.00 664.00 485.50 395.50 130.00 68.00 64.00 194.00 361.00 560.00 854.00 5166.50
1928 744.00 662.00 536.00 480.50 232.50 166.00 63.50 88.00 190.00 394.50 555.00 756.50 4868.50
1929 956.50 846.00 631.50 535.71 b 330.00 188.50 57.00 f 53.00 157.50 218.00 f 620.00 685.10 a 5003.81
1930 1027.00 597.00 591.50 367.50 361.50 198.00 101.50 42.00 178.00 436.00 613.39 b 702.50 5215.89
1931 603.00 580.50 550.50 0.00 z 0.00 z 124.50 30.00 33.00 161.50 363.00 643.00 734.18 a 3823.18
1932 819.95 a 692.00 562.50 391.50 286.00 109.00 101.00 46.00 132.00 308.00 484.50 824.00 4756.45
1933 784.00 754.50 596.00 441.00 357.50 162.00 73.00 49.00 226.55 a 350.50 553.00 645.00 4992.05
1934 616.00 483.00 403.50 242.00 191.00 93.00 59.50 25.00 186.50 310.00 471.00 679.50 3760.00
1935 749.00 555.00 672.50 465.50 274.50 116.50 89.00 67.50 106.50 414.00 650.50 654.50 4815.00
1936 667.00 866.00 650.50 342.00 186.00 65.50 18.00 11.50 150.50 280.00 569.50 668.00 4474.50
1937 1071.50 684.50 501.00 476.00 253.50 80.00 30.00 46.00 123.00 263.50 508.00 640.50 4677.50
1938 707.00 591.00 568.00 350.00 248.00 93.00 39.00 52.00 64.50 322.50 621.00 686.50 4342.50
1939 654.50 699.00 589.00 345.00 255.50 185.00 c 54.50 41.50 150.50 362.00 441.50 578.50 4356.50
1940 680.97 a 570.50 496.50 347.00 206.00 82.00 31.00 42.37 a 64.50 271.00 644.00 634.47 a 4070.30
1941 654.62 a 522.50 427.50 321.50 264.50 100.00 7.00 46.00 184.50 387.50 473.50 695.00 4084.12
1942 734.00 641.50 585.79 b 402.50 269.50 181.50 16.00 31.50 74.50 255.75 a 605.00 676.32 a 4473.86
1943 935.50 578.50 616.50 363.62 a 328.50 167.00 59.23 c 37.09 c 82.50 313.00 524.50 717.13 a 4723.08
1944 701.00 652.00 638.00 424.50 284.50 146.90 a 43.06 d 58.38 a 87.50 236.50 570.50 763.50 4606.34
1945 693.50 608.00 643.77 a 524.50 214.50 179.50 34.00 47.50 198.50 333.25 a 617.50 733.67 a 4828.18
1946 699.50 621.00 625.17 a 464.50 206.67 a 158.79 a 46.50 b 0.00 z 109.00 j 470.54 c 531.50 g 522.50 h 3292.66
1947 886.60 a 0.00 z 497.00 360.56 c 196.50 101.90 a 23.50 42.50 h 0.00 z 0.00 z 595.00 651.50 3312.55
1948 771.50 696.50 625.50 521.00 298.50 69.50 46.00 58.00 169.50 393.50 609.50 820.00 5079.00
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 792.16 634.95 602.84 440.33 279.36 139.56 57.64 57.82 147.96 357.78 570.92 719.77 4751.18
S.D. 123.66 99.33 82.14 84.80 78.80 47.47 34.32 38.58 56.68 60.24 69.90 86.01 420.71
SKEW 0.76 0.80 0.10 1.24 1.26 0.10 0.71 1.55 0.44 0.23 -0.02 0.58 0.45
MAX 1163.50 1006.00 888.50 846.50 638.00 255.00 156.00 191.00 336.50 514.94 750.00 975.50 5924.00
MIN 589.50 424.50 403.50 242.00 127.10 47.78 1.60 2.50 30.52 236.50 399.00 575.57 3760.00
NO YRS 69 72 74 73 72 68 66 66 67 68 71 68 50