SEATTLE WB AIRPORT, WASHINGTON

Monthly Total Heating Degree Days

(457483)

Base Temperature = 65 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 196509
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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 82.50 58.50 0.00 z 210.50 422.50 634.00 846.50 2254.50
1949 1039.50 729.00 557.50 391.00 190.00 146.90 a 73.00 40.00 138.50 485.50 442.50 763.00 4996.40
1950 1172.00 639.00 645.00 480.50 341.50 111.50 24.50 26.00 163.00 425.50 585.50 553.50 5167.50
1951 806.50 625.85 a 717.50 399.00 268.50 85.50 18.50 57.00 135.00 389.50 579.00 829.00 4910.85
1952 834.00 644.00 636.00 428.00 281.00 186.50 40.00 49.00 119.00 280.50 672.00 682.50 4852.50
1953 568.00 607.50 592.50 451.50 283.50 178.50 38.00 26.50 128.50 319.50 498.00 647.50 4339.50
1954 828.00 576.00 673.00 502.00 268.00 208.00 96.50 88.50 137.50 390.50 443.50 698.00 4909.50
1955 737.50 689.50 748.50 547.50 376.00 180.50 98.00 84.00 196.50 391.00 729.00 772.00 5550.00
1956 767.50 803.00 698.00 412.50 204.50 178.00 36.00 57.00 181.00 420.50 635.50 715.00 5108.50
1957 961.50 670.50 588.50 389.00 147.50 83.00 50.00 41.00 47.50 395.50 603.50 630.00 4607.50
1958 631.50 447.50 584.00 399.00 124.00 39.00 1.50 12.50 134.00 322.00 609.50 593.00 3897.50
1959 721.50 635.00 591.00 413.50 296.50 102.50 33.00 51.00 194.00 370.50 605.00 726.50 4740.00
1960 765.00 635.00 614.00 411.00 280.50 96.50 20.00 77.50 152.50 320.50 575.50 752.50 4700.50
1961 627.00 517.50 535.50 447.00 260.50 60.50 10.50 3.00 175.50 409.00 652.00 731.50 4429.50
1962 771.00 581.50 647.50 370.00 344.00 130.00 67.50 46.50 92.50 314.50 496.50 635.00 4496.50
1963 884.50 454.50 596.50 457.50 232.00 145.50 41.50 7.50 47.50 273.50 531.00 664.50 4336.00
1964 669.50 628.00 590.50 483.00 314.00 134.50 32.00 52.50 156.00 314.00 616.00 839.00 4829.00
1965 730.50 587.50 563.50 388.50 306.50 73.00 19.50 19.50 165.50 0.00 z 0.00 z 0.00 z 2854.00
Period of Record Statistics
MEAN 795.00 615.93 622.29 433.56 265.79 123.47 42.14 43.47 143.03 367.32 582.82 710.53 4741.95
S.D. 153.65 88.82 59.18 48.11 68.22 49.28 27.41 25.56 45.67 59.09 78.56 85.05 393.87
SKEW 0.89 -0.13 0.66 0.82 -0.56 0.10 0.72 0.14 -0.75 0.07 -0.31 -0.01 -0.11
MAX 1172.00 803.00 748.50 547.50 376.00 208.00 98.00 88.50 210.50 485.50 729.00 846.50 5550.00
MIN 568.00 447.50 535.50 370.00 124.00 39.00 1.50 3.00 47.50 273.50 442.50 553.50 3897.50
NO YRS 17 17 17 17 17 18 18 17 18 17 17 17 16