SEDRO WOOLLEY, WASHINGTON

Monthly Total Heating Degree Days

(457507)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1896 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 53.06 e 293.50 385.50 856.00 612.50 2200.56
1897 782.50 642.50 752.00 367.00 212.50 94.50 108.00 39.00 208.97 a 399.50 709.00 744.00 5059.47
1898 820.00 547.00 664.00 384.00 212.50 125.00 109.00 67.00 138.50 395.50 674.50 903.50 5040.50
1899 868.50 847.00 699.50 449.50 398.50 245.00 0.00 z 111.00 h 129.00 341.00 g 421.50 654.50 4713.00
1900 627.00 686.50 335.50 j 442.50 265.50 f 168.60 e 114.50 177.00 256.00 487.00 704.00 657.00 4320.10
1901 900.00 685.00 629.00 543.00 328.50 288.00 198.83 b 41.33 a 247.00 295.00 532.50 826.50 5514.66
1902 0.00 z 554.00 619.48 a 442.00 288.00 198.50 130.72 a 113.00 i 291.00 380.50 668.50 796.50 4369.20
1903 773.50 744.00 723.50 519.50 348.50 128.00 134.50 93.50 257.50 378.50 604.50 750.50 5456.00
1904 790.00 782.50 720.50 382.00 346.17 a 149.50 h 87.00 175.00 232.50 388.50 499.50 728.50 5132.17
1905 818.00 679.00 518.50 410.50 354.00 0.00 z 66.00 140.00 219.00 567.00 652.00 751.00 5175.00
1906 765.00 645.00 618.00 398.00 317.00 172.00 29.00 113.00 241.50 416.00 682.00 771.00 5167.50
1907 1110.00 701.50 726.00 523.50 271.77 a 199.44 c 85.00 150.35 a 244.00 421.00 575.50 0.00 z 5008.06
1908 849.00 709.50 618.50 392.78 c 311.00 178.00 g 52.00 105.00 257.50 427.00 527.50 896.50 5146.28
1909 1078.50 666.50 0.00 z 496.00 358.50 122.50 124.50 144.00 217.00 421.00 681.50 988.12 c 5298.12
1910 930.55 c 806.30 a 437.50 357.50 122.50 159.50 105.00 147.50 189.00 419.00 663.00 746.00 5083.35
1911 1001.00 754.00 589.50 549.50 345.50 224.00 87.50 131.00 274.66 a 485.50 710.00 791.00 5943.16
1912 794.00 654.00 687.00 464.50 254.00 169.50 93.50 134.00 257.50 523.50 607.50 807.50 5446.50
1913 993.00 789.50 766.50 462.00 368.00 181.50 121.00 106.50 237.50 504.00 638.50 740.00 5908.00
1914 743.50 721.50 601.00 402.50 219.00 137.07 a 39.27 a 93.00 296.50 358.00 580.96 d 940.00 5132.30
1915 857.50 586.50 487.00 367.24 a 222.50 80.50 36.00 0.00 z 216.50 394.00 731.00 810.00 4788.74
1916 1201.50 736.50 661.00 420.00 321.50 133.50 82.50 64.50 233.00 550.50 741.50 970.50 6116.50
1917 954.50 796.00 767.50 507.00 327.00 182.50 35.50 36.00 218.50 448.50 488.50 745.50 5507.00
1918 734.00 739.50 649.50 483.50 385.00 165.50 104.00 116.00 175.50 393.00 609.00 776.50 5331.00
1919 774.00 721.50 648.00 446.50 344.50 275.00 157.50 126.00 221.00 572.50 660.50 838.00 5785.00
1920 874.50 741.50 645.50 598.00 436.50 201.00 92.50 97.00 245.50 477.50 577.50 718.00 5705.00
1921 784.00 654.50 665.50 498.50 366.00 162.50 162.50 124.00 270.00 428.50 637.00 877.50 5630.50
1922 974.50 769.50 707.00 554.50 357.50 161.50 139.00 131.50 206.00 398.00 663.00 917.37 d 5979.37
1923 809.00 803.50 670.50 433.00 315.00 172.00 70.00 42.50 172.00 337.00 543.50 728.00 5096.00
1924 792.50 542.00 662.00 488.00 278.50 189.00 138.00 123.50 223.97 a 395.80 c 671.50 955.50 5460.27
1925 776.00 576.00 645.50 432.00 255.00 203.00 86.00 122.00 216.00 539.00 598.50 642.50 5091.50
1926 794.00 573.50 509.00 340.50 270.50 139.50 84.50 112.50 297.50 342.00 524.00 834.00 4821.50
1927 820.00 637.50 679.50 501.50 385.00 146.50 91.50 103.73 e 222.00 377.50 669.50 960.00 5594.23
1928 747.50 639.50 537.00 442.00 271.00 177.50 83.50 145.00 278.00 455.50 578.00 790.50 a 5145.00
1929 1054.00 920.00 612.00 0.00 z 337.50 202.00 115.00 89.00 216.50 340.50 671.50 763.50 5321.50
1930 1118.50 604.50 330.50 m 369.64 b 385.50 192.00 141.50 95.50 239.50 482.57 a 442.50 n 726.50 4355.71
1931 622.00 627.50 571.00 392.50 281.50 192.00 116.00 146.50 178.50 414.00 707.50 774.00 5023.00
1932 872.50 738.50 611.00 434.00 326.00 191.38 a 207.00 113.00 235.00 409.00 535.00 922.50 5594.88
1933 853.00 837.50 630.00 516.00 376.50 277.50 171.50 59.70 d 269.50 426.50 590.00 687.00 5694.70
1934 661.50 491.00 475.00 315.50 253.50 181.00 112.00 82.00 238.50 350.96 c 468.33 c 754.50 4383.80
1935 790.50 543.00 701.52 d 503.50 343.00 160.00 138.00 125.00 185.50 451.00 707.00 688.00 5336.02
1936 749.00 981.50 709.50 407.50 250.50 140.00 119.50 83.00 259.00 367.50 666.50 737.50 5471.00
1937 1186.50 751.50 537.00 522.00 360.50 154.00 108.50 122.50 203.50 327.00 571.00 721.50 5565.50
1938 783.00 626.50 613.00 401.00 309.00 161.00 99.50 142.00 146.50 378.00 695.50 766.00 5121.00
1939 704.50 751.50 649.50 404.50 289.00 227.50 116.00 84.50 222.50 425.50 416.00 556.00 4847.00
1940 723.50 610.00 499.50 361.00 251.50 187.50 128.50 97.50 185.00 368.50 721.50 687.00 4821.00
1941 637.00 521.00 443.00 363.00 298.50 168.00 57.00 74.50 246.00 363.00 540.00 745.00 4456.00
1942 768.50 638.00 584.00 387.50 288.50 209.50 55.00 55.00 196.00 347.50 669.50 737.00 4936.00
1943 928.28 d 590.69 b 655.50 374.50 354.50 214.00 71.50 72.00 136.00 373.50 562.00 823.00 5155.47
1944 725.50 627.00 635.50 416.00 203.00 120.50 19.00 26.50 159.50 271.50 550.00 837.50 4591.50
1945 717.50 580.50 605.50 474.00 208.50 157.50 46.00 58.00 214.50 380.00 666.00 808.00 4916.00
1946 732.00 664.50 595.00 486.50 234.00 126.50 64.00 103.50 173.00 541.00 745.00 833.00 5298.00
1947 941.50 634.50 580.00 394.50 262.00 150.00 92.50 119.00 197.50 398.50 720.50 728.00 5218.50
1948 856.00 792.00 676.50 531.00 345.00 123.00 115.50 107.00 257.00 473.00 702.00 966.00 5944.00
1949 1136.50 810.00 628.50 431.50 307.50 225.50 146.00 109.50 185.00 534.50 359.00 g 862.00 5376.50
1950 1304.00 715.00 679.50 517.50 436.50 133.00 100.50 84.00 228.50 462.50 670.00 618.50 5949.50
1951 857.00 682.00 758.50 466.00 331.00 156.00 70.00 108.00 168.50 432.00 620.00 901.50 5550.50
1952 896.00 680.98 a 681.00 481.00 313.50 266.50 101.00 97.00 161.50 367.00 710.00 734.00 5489.48
1953 641.00 644.50 628.00 453.50 290.00 220.50 85.50 53.50 173.00 377.50 502.00 710.86 b 4779.86
1954 944.50 609.50 715.50 554.00 315.50 262.00 170.00 145.50 180.50 443.50 476.00 734.00 5550.50
1955 821.50 751.50 812.00 554.00 436.00 216.00 175.50 153.50 244.00 443.00 816.50 875.50 6299.00
1956 825.50 867.00 716.50 466.00 265.00 209.50 65.50 81.50 204.00 483.00 700.00 800.00 5683.50
1957 1090.00 777.50 632.50 423.50 222.50 149.50 148.00 111.50 125.00 461.00 672.50 684.50 5498.00
1958 668.50 503.00 610.00 449.50 213.00 60.00 11.00 46.00 190.50 377.50 711.00 654.00 4494.00
1959 793.50 686.00 635.50 460.50 315.50 140.50 71.00 138.50 237.00 439.00 684.00 768.50 5369.50
1960 829.50 688.50 642.00 434.00 329.50 184.50 90.50 132.00 243.50 394.50 638.50 790.00 5397.00
1961 672.00 583.00 557.00 490.50 308.00 114.00 48.50 47.50 250.00 507.50 702.50 802.50 5083.00
1962 838.50 610.50 719.00 438.50 400.00 197.00 129.00 95.50 185.00 400.00 558.50 732.00 5303.50
1963 1010.00 495.70 a 659.50 493.50 311.00 188.50 126.00 76.50 116.00 345.00 628.50 735.00 5185.20
1964 740.00 721.00 680.50 570.50 382.50 209.00 103.00 122.50 269.50 414.00 0.00 z 545.50 k 4212.50
1965 841.13 a 688.00 675.50 470.50 430.50 220.34 a 92.50 88.19 b 278.50 353.50 498.50 777.00 5414.17
1966 788.50 656.00 655.50 495.00 389.50 235.71 b 164.00 111.08 a 164.00 470.17 a 605.00 638.60 a 5373.06
1967 737.00 642.50 714.00 552.50 341.55 c 114.00 106.43 a 34.50 114.83 a 375.00 602.50 812.50 5147.31
1968 810.50 598.50 547.50 540.50 336.87 a 218.28 a 98.88 b 122.50 233.28 a 463.50 590.00 942.50 5502.80
1969 1082.50 715.00 647.00 507.00 276.93 a 93.00 148.80 a 172.57 a 219.31 a 458.50 599.00 704.00 5623.61
1970 826.50 594.00 634.50 561.72 a 383.76 b 159.50 117.00 128.13 a 318.50 524.50 631.03 a 840.00 5719.15
1971 876.50 675.50 743.00 493.00 352.88 a 265.34 a 126.00 41.00 251.50 509.50 626.00 931.00 5891.23
1972 949.50 718.00 622.50 573.50 305.02 c 210.52 a 105.00 80.50 315.50 526.50 621.00 901.50 5929.04
1973 820.50 637.00 628.50 510.50 330.67 a 208.50 111.00 166.22 b 185.50 430.50 726.00 687.17 a 5442.06
1974 891.25 a 671.00 652.00 474.31 a 413.50 186.50 123.00 87.50 105.00 413.00 574.00 669.50 5260.56
1975 825.63 a 726.50 690.78 a 578.00 324.43 b 232.50 82.50 136.50 185.50 444.00 656.50 761.50 5644.35
1976 740.00 0.00 z 733.50 483.00 344.50 266.38 a 108.50 138.00 155.00 431.50 614.00 683.00 4697.38
1977 896.00 537.50 672.00 439.66 a 384.50 171.00 146.50 61.50 246.50 439.17 a 681.50 804.00 5479.82
1978 741.00 574.50 567.00 440.00 349.50 107.50 76.50 78.00 218.00 394.00 763.50 882.50 5192.00
1979 1008.00 744.69 b 558.50 473.50 266.50 182.50 69.50 52.00 111.50 367.00 655.50 650.47 b 5139.66
1980 947.00 642.00 637.00 384.50 313.00 211.00 112.50 123.50 195.00 374.00 538.50 672.50 5150.50
1981 660.00 639.50 512.00 483.50 307.50 231.50 105.00 59.50 188.00 485.50 536.50 760.50 4969.00
1982 872.00 697.00 640.00 529.50 343.50 125.00 0.00 z 102.50 161.50 419.00 732.50 780.00 5402.50
1983 655.50 533.50 494.00 441.50 253.50 170.50 101.50 55.50 252.50 448.50 529.50 946.50 4882.50
1984 726.50 611.00 528.50 472.50 370.00 201.00 104.50 69.50 205.50 481.00 615.50 915.00 5300.50
1985 929.00 736.00 677.00 476.00 313.50 183.00 25.00 89.00 262.00 447.00 963.00 937.00 6037.50
1986 605.00 651.00 484.00 512.50 302.00 125.50 148.50 34.00 214.00 391.50 621.00 721.00 4810.00
1987 758.50 539.00 510.00 389.00 299.50 168.00 83.50 77.00 159.50 397.00 506.00 798.50 4685.50
1988 757.50 653.50 623.00 457.00 320.00 197.00 128.00 89.50 216.00 353.00 593.50 720.50 5108.50
1989 789.00 865.00 662.50 389.50 340.00 129.50 115.50 83.00 154.00 396.50 587.00 729.00 5240.50
1990 722.00 772.00 573.50 401.00 315.00 190.00 47.00 42.50 151.00 442.50 575.00 976.00 5207.50
1991 0.00 z 511.50 672.50 475.50 321.00 236.50 66.50 67.50 163.50 443.50 566.00 684.50 4208.50
1992 647.50 543.00 497.50 361.00 239.50 99.50 69.00 66.00 215.00 371.00 585.50 850.50 4545.00
1993 991.50 675.00 558.00 418.00 173.00 154.50 115.00 83.00 205.00 342.50 756.00 782.50 5254.00
1994 630.50 727.50 539.50 393.50 250.50 185.00 71.00 35.50 120.50 411.00 734.50 732.50 4831.50
1995 708.50 593.00 572.50 438.00 237.00 126.00 0.00 z 0.00 z 0.00 z 407.00 521.50 719.50 4323.00
1996 806.50 678.50 570.00 379.00 385.00 180.50 79.00 58.00 233.50 455.00 671.50 872.00 5368.50
1997 771.50 634.00 608.50 437.50 213.50 150.50 79.50 18.50 109.00 411.00 485.50 717.00 4636.00
1998 0.00 z 519.00 559.50 454.00 320.00 177.50 54.50 62.50 173.50 447.00 598.50 860.00 4226.00
1999 749.50 666.50 643.00 519.50 417.50 232.00 136.50 60.40 b 201.50 509.00 574.00 835.00 5544.40
2000 857.50 667.50 621.55 a 399.00 329.00 163.50 81.78 b 93.00 169.50 388.50 676.00 767.00 5213.83
2001 682.00 675.50 588.00 489.00 326.00 234.83 a 111.00 54.50 176.50 454.00 525.00 755.50 5071.83
2002 741.00 656.50 729.00 499.50 341.00 144.50 85.00 79.88 e 193.00 463.00 545.00 691.00 5168.38
2003 632.00 660.00 563.50 453.00 306.50 107.00 35.50 36.50 155.50 319.50 692.50 718.00 4679.50
2004 754.50 593.00 523.50 350.00 228.00 115.00 31.50 24.50 204.50 383.00 606.00 704.50 4518.00
2005 716.50 636.00 493.00 411.00 186.50 149.50 54.50 27.50 203.50 327.50 667.00 755.00 4627.50
2006 633.00 666.50 589.50 449.00 302.00 122.00 67.00 74.50 179.00 487.50 611.50 725.00 4906.50
2007 859.50 609.00 576.50 446.00 315.50 185.00 45.00 82.00 230.00 456.50 636.50 795.00 5236.50
2008 835.50 661.50 670.00 564.00 307.00 251.00 91.00 69.50 194.00 451.00 493.00 925.00 5512.50
2009 891.50 655.50 722.50 453.50 0.00 z 96.50 56.32 a 64.50 107.50 427.00 544.50 890.00 4909.32
2010 553.00 518.50 520.00 439.00 352.00 188.50 72.50 76.00 138.00 346.50 672.00 699.00 4575.00
2011 748.13 a 729.00 621.50 574.00 392.00 160.00 92.00 65.00 107.14 b 312.00 g 693.62 a 671.00 g 4182.40
2012 669.50 f 448.50 i 257.00 s 319.00 i 0.00 z 195.50 k 101.50 j 0.00 z 0.00 z 1130.50 1205.50 1457.00 3793.00
2013 1179.00 878.00 777.50 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 2834.50
Period of Record Statistics
MEAN 828.99 670.98 626.06 457.62 313.07 176.18 97.54 91.39 206.48 427.82 631.40 788.69 5272.21
S.D. 142.02 94.14 77.58 61.52 60.80 46.51 38.48 37.48 48.83 88.74 103.02 112.03 412.10
SKEW 0.89 0.48 -0.20 0.11 -0.35 0.11 0.21 0.18 -0.11 4.37 1.64 1.98 0.01
MAX 1304.00 981.50 812.00 598.00 436.50 288.00 207.00 177.00 318.50 1130.50 1205.50 1457.00 6299.00
MIN 553.00 491.00 437.50 315.50 122.50 60.00 11.00 18.50 105.00 271.50 416.00 556.00 4383.80
NO YRS 113 115 113 114 113 112 112 112 115 115 114 114 95