SEATTLE SAND PT WSFO, WASHINGTON

Monthly Total Heating Degree Days

(457470)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 200601
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 746.58 a 585.00 521.50 347.50 223.50 84.00 17.50 6.50 148.00 331.00 564.00 673.00 4248.08
2005 688.00 615.50 487.00 398.00 196.50 137.50 23.50 8.00 0.00 z 312.00 630.00 718.00 4214.00
2006 632.00 0.00 z 0.00 z 448.00 272.50 95.00 c 21.00 j 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1447.50
Period of Record Statistics
MEAN 705.03 602.06 563.50 412.00 263.82 127.63 38.25 26.31 107.38 342.98 551.10 721.32 4442.40
S.D. 59.05 56.03 55.51 40.99 67.44 33.78 15.97 19.64 40.01 53.87 67.15 55.78 247.85
SKEW 0.14 -0.27 0.58 0.13 -0.28 0.42 0.13 1.26 0.05 -0.41 0.36 1.62 0.24
MAX 836.00 682.50 687.50 484.50 374.50 200.00 70.00 84.00 176.50 417.00 668.00 896.00 4806.00
MIN 595.50 501.50 480.00 347.50 126.50 70.50 11.00 3.00 39.00 252.00 456.50 655.50 4077.50
NO YRS 19 17 17 18 19 19 16 18 17 18 18 20 11