MOUNT VERNON 3 WNW, WASHINGTON

Monthly Total Heating Degree Days

(455678)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 200501
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
1956 791.50 861.50 718.50 486.43 b 305.00 262.50 120.50 151.00 265.50 478.50 700.00 788.00 5928.93
1957 1092.50 773.50 634.00 448.50 247.00 166.00 146.50 120.26 b 155.00 454.50 660.00 658.50 5556.26
1958 653.50 485.50 624.50 464.00 206.50 76.00 17.50 35.50 210.00 406.50 663.00 623.50 4466.00
1959 739.87 a 681.50 507.00 f 471.50 346.50 152.50 84.00 148.50 249.50 440.00 673.00 761.50 4748.37
1960 812.50 469.00 h 655.50 456.50 351.50 208.00 91.50 147.50 276.00 385.50 640.00 784.50 4809.00
1961 670.00 543.50 572.00 495.50 322.50 130.50 71.00 40.00 279.50 515.50 702.00 779.00 5121.00
1962 816.50 614.50 697.00 458.50 402.00 201.50 141.50 102.00 198.50 392.00 553.00 692.50 5269.50
1963 974.50 509.50 640.00 492.50 330.50 203.00 149.50 80.00 135.50 341.00 598.00 712.00 5166.00
1964 722.00 721.50 681.00 590.00 426.50 235.00 148.00 165.00 306.50 458.00 730.00 904.00 6087.50
1965 829.00 673.50 690.00 484.50 436.50 243.50 115.00 104.50 332.07 a 375.50 526.00 788.50 5598.57
1966 752.50 648.00 639.50 508.50 399.50 242.00 166.50 123.50 171.00 490.50 582.50 637.57 a 5361.57
1967 696.00 634.50 700.50 570.50 357.00 136.00 97.50 48.50 144.50 377.50 614.00 778.00 5154.50
1968 772.00 607.50 561.00 549.50 328.00 225.50 74.00 124.00 247.50 477.00 608.00 902.00 5476.00
1969 1080.50 699.00 641.00 508.00 291.50 107.00 152.50 188.00 230.00 489.00 598.00 710.00 5694.50
1970 807.50 585.50 657.00 565.00 399.50 192.00 130.00 143.00 312.50 537.50 656.50 818.50 5804.50
1971 826.50 669.50 733.50 512.50 369.50 287.00 147.50 59.00 290.00 530.50 603.00 913.50 5942.00
1972 948.50 710.00 595.00 580.00 308.00 235.00 125.00 95.50 329.00 527.00 590.00 871.50 5914.50
1973 825.50 624.50 616.00 508.00 311.00 194.00 125.00 166.50 178.00 434.50 688.50 670.00 5341.50
1974 840.00 636.50 626.50 479.00 425.50 200.50 153.50 105.50 134.00 441.00 560.00 675.50 5277.50
1975 813.50 703.00 685.00 586.50 349.50 249.00 100.50 136.00 210.00 432.00 611.00 736.00 5612.00
1976 716.00 696.00 719.50 491.00 338.50 271.00 96.00 146.50 173.00 435.50 617.00 686.00 5386.00
1977 892.00 553.00 671.00 456.50 384.50 177.41 a 143.00 65.50 262.00 455.00 674.50 764.50 5498.91
1978 738.00 571.00 560.00 461.00 355.00 124.00 72.50 69.00 227.50 423.50 763.00 888.00 5252.50
1979 1005.00 689.50 593.00 497.50 306.50 222.50 96.50 98.50 135.50 389.50 702.00 647.50 5383.50
1980 953.50 608.00 651.50 435.00 363.50 251.50 148.00 172.50 253.50 433.50 575.69 a 678.50 5524.69
1981 675.50 628.00 554.50 507.00 351.50 266.00 129.50 93.00 211.50 486.50 541.00 767.00 5211.00
1982 862.00 660.00 676.50 568.00 381.00 154.00 168.00 128.50 186.50 405.00 692.00 744.50 5626.00
1983 651.00 544.50 518.50 488.50 288.00 190.50 125.00 67.50 262.00 480.50 526.50 955.00 5097.50
1984 717.50 590.50 538.50 489.00 374.00 202.00 118.50 94.50 254.00 517.00 631.00 960.00 5486.50
1985 965.00 739.50 690.00 489.00 338.00 218.00 40.50 101.00 276.50 447.00 959.00 919.00 6182.50
1986 594.00 674.50 510.50 547.00 320.00 170.00 164.00 44.50 243.50 415.00 631.00 745.50 5059.50
1987 752.00 550.00 516.00 428.50 315.50 176.00 116.00 103.00 198.00 459.50 524.50 804.50 4943.50
1988 801.50 662.50 663.00 505.50 350.00 226.00 149.50 117.50 272.50 390.50 611.50 738.00 5488.00
1989 790.00 871.63 a 680.00 426.50 358.50 164.50 142.50 120.00 210.50 448.50 586.50 746.00 5545.13
1990 738.00 771.50 621.00 435.00 346.00 196.00 56.00 60.50 199.50 472.00 588.00 953.50 5437.00
1991 845.00 518.00 698.50 512.00 367.50 263.50 109.00 83.50 201.50 526.50 580.50 643.00 5348.50
1992 645.00 561.00 522.50 0.00 z 241.00 111.00 74.50 83.50 245.50 0.00 z 612.50 860.50 3957.00
1993 966.50 703.50 567.50 411.00 182.00 104.00 i 137.00 100.00 241.00 370.00 756.50 753.50 5188.50
1994 627.00 686.00 569.00 409.50 264.00 217.00 69.50 48.00 135.00 465.00 708.00 739.00 4937.00
1995 715.00 591.50 583.50 470.00 271.50 147.00 52.00 115.00 103.00 428.00 481.50 712.50 4670.50
1996 798.50 669.50 580.00 392.00 380.50 191.00 85.00 71.00 249.50 455.00 656.50 848.00 5376.50
1997 731.00 642.00 593.50 452.00 218.50 151.00 70.00 24.50 118.50 413.00 521.00 714.00 4649.00
1998 693.00 519.00 555.00 474.00 310.00 162.50 0.00 z 43.50 159.50 415.50 525.50 776.50 4634.00
1999 694.00 595.00 622.50 519.50 404.50 223.00 126.50 71.00 228.00 463.50 505.00 732.50 5185.00
2000 767.00 0.00 z 616.50 431.00 336.00 163.00 0.00 z 107.50 204.50 0.00 z 0.00 z 772.50 3398.00
2001 703.18 a 715.50 615.00 518.28 a 331.50 229.00 0.00 z 62.50 214.50 472.50 531.50 749.50 5142.96
2002 743.50 0.00 z 745.50 492.50 371.50 0.00 z 90.50 81.12 a 210.00 476.00 534.00 676.00 4420.62
2003 632.00 678.50 563.00 460.50 311.00 120.00 0.00 z 0.00 z 154.50 325.00 712.00 697.50 4654.00
2004 736.50 612.00 525.00 376.00 263.50 115.00 44.71 e 13.50 0.00 z 0.00 z 0.00 z 744.50 3430.71
2005 795.09 d 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 795.09
Period of Record Statistics
MEAN 788.15 645.31 622.67 486.64 333.41 192.53 110.69 97.30 218.45 444.61 623.49 767.79 5386.18
S.D. 115.15 84.37 63.65 50.27 56.47 49.93 37.85 41.44 56.65 49.93 86.10 89.36 374.54
SKEW 0.81 0.47 -0.02 0.16 -0.59 -0.23 -0.47 0.12 -0.04 -0.18 1.22 0.60 -0.18
MAX 1092.50 871.63 745.50 590.00 436.50 287.00 168.00 188.00 332.07 537.50 959.00 960.00 6182.50
MIN 594.00 485.50 510.50 376.00 182.00 76.00 17.50 13.50 103.00 325.00 481.50 623.50 4466.00
NO YRS 50 46 48 48 49 47 45 48 48 46 47 49 39