SEATTLE SAND PT WSFO, WASHINGTON

Monthly Total Heating Degree Days

(457470)

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
1986 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 292.00 546.00 692.33 a 1530.33
1987 719.00 522.50 506.50 361.00 240.50 108.00 47.00 28.00 80.50 258.00 456.50 750.00 4077.50
1988 716.00 573.00 575.00 418.00 281.50 153.50 45.00 26.00 145.00 258.50 528.50 702.50 4422.50
1989 738.00 0.00 z 0.00 z 353.50 281.00 103.50 43.00 28.00 88.00 347.00 514.50 671.50 3168.00
1990 684.50 682.50 548.00 389.50 301.00 145.50 0.00 z 10.00 54.50 417.00 534.50 896.00 4663.00
1991 779.50 501.50 651.00 0.00 z 340.00 200.00 26.00 39.00 96.50 382.50 526.50 661.50 4204.00
1992 659.50 535.00 480.00 365.00 202.00 70.50 41.00 21.00 167.00 344.00 570.50 804.00 4259.50
1993 836.00 668.50 541.00 425.50 126.50 96.00 70.00 36.50 100.50 252.00 627.41 a 714.50 4494.41
1994 629.50 671.00 536.50 389.50 233.50 140.50 27.00 3.00 39.00 379.50 668.00 746.50 4463.50
1995 637.50 567.50 574.00 427.00 164.00 110.50 26.50 84.00 63.50 366.00 466.50 698.50 4185.50
1996 766.00 639.50 568.00 401.50 374.50 159.50 48.00 32.00 176.50 399.00 0.00 z 769.50 4334.00
1997 723.00 616.50 611.50 445.50 194.00 137.00 29.00 4.00 66.50 0.00 z 460.00 698.50 3985.50
1998 681.00 535.00 543.00 418.00 291.00 131.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 744.50 3343.50
1999 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 33.00 136.50 375.50 511.00 682.00 1738.00
2000 744.00 603.00 618.50 406.50 337.50 136.50 46.50 48.00 123.00 358.50 645.00 739.00 4806.00
2001 696.50 662.50 587.00 479.50 305.00 188.50 58.50 26.00 127.00 405.58 a 519.31 a 704.50 4759.89
2002 723.50 627.00 687.50 484.50 351.50 126.00 52.50 32.00 121.00 401.00 503.00 655.50 4765.00
2003 595.50 629.50 543.50 458.00 296.50 102.00 11.00 8.50 92.50 294.50 648.50 704.50 4384.50
2004 745.00 585.00 521.50 347.50 223.50 84.00 17.50 6.50 148.00 331.00 564.00 673.00 4246.50
2005 688.00 615.50 487.00 398.00 196.50 137.50 23.50 8.00 154.00 312.00 630.00 718.00 4368.00
2006 632.00 663.50 590.50 448.00 272.50 94.00 27.50 36.00 111.50 384.50 597.00 727.00 4584.00
2007 801.00 577.00 548.00 426.00 292.50 144.50 2.50 17.00 149.50 418.00 602.00 749.00 4727.00
2008 789.50 606.00 651.00 541.00 295.50 230.00 38.00 37.00 128.00 398.00 460.50 837.50 5012.00
2009 783.00 646.00 689.50 476.50 288.00 68.00 25.50 25.50 98.50 382.50 535.00 832.50 4850.50
2010 585.00 515.50 537.00 442.50 353.00 175.50 70.50 63.50 93.00 319.50 608.00 653.50 4416.50
2011 694.00 696.50 574.50 542.50 375.00 169.00 60.00 17.00 63.50 354.50 626.00 753.50 4926.00
2012 765.00 612.50 639.50 399.50 302.50 191.00 47.50 16.00 85.50 330.50 519.00 696.50 4605.00
2013 807.00 571.00 527.50 11.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 29.50 z 1905.50
Period of Record Statistics
MEAN 716.10 604.92 573.48 426.83 276.76 136.08 38.41 27.42 108.36 350.44 554.69 728.73 4544.94
S.D. 66.45 55.47 57.45 52.09 65.16 41.41 17.81 18.71 36.89 50.30 64.35 59.01 266.01
SKEW -0.24 -0.23 0.49 0.62 -0.51 0.31 0.00 1.18 0.03 -0.58 0.12 1.12 0.05
MAX 836.00 696.50 689.50 542.50 375.00 230.00 70.50 84.00 176.50 418.00 668.00 896.00 5012.00
MIN 585.00 501.50 480.00 347.50 126.50 68.00 2.50 3.00 39.00 252.00 456.50 653.50 4077.50
NO YRS 26 25 25 24 25 25 23 25 25 25 25 27 19