SEATTLE URBAN SITE, WASHINGTON

Monthly Total Growing Degree Days

(457458)

Base Temperature = 40 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 199804
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
1972 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 118.50 118.50
1973 88.50 138.00 208.50 314.50 538.50 617.00 795.00 689.50 639.50 397.00 111.50 137.50 4675.00
1974 95.00 100.50 176.00 295.00 427.00 631.00 751.50 816.50 743.00 437.50 237.00 151.00 4861.00
1975 91.00 75.50 132.00 219.50 489.00 588.00 814.27 a 707.00 668.00 393.00 194.50 135.50 4507.27
1976 133.50 98.00 139.50 336.00 496.50 572.50 775.00 714.50 651.50 433.50 243.50 149.50 4743.50
1977 71.00 209.00 151.00 367.00 422.00 643.00 712.50 869.00 558.50 378.00 176.50 90.50 4648.00
1978 121.50 172.50 280.50 318.50 462.00 714.00 785.50 773.00 570.50 456.50 102.50 49.00 4806.00
1979 12.50 88.00 288.00 332.00 552.00 637.50 815.50 782.00 695.50 464.00 153.00 156.00 4976.00
1980 35.00 163.00 212.50 402.50 497.00 574.00 758.00 719.50 643.50 463.50 251.50 207.50 4927.50
1981 170.00 165.50 322.00 365.00 517.00 600.50 777.50 911.00 664.50 386.00 258.00 95.00 5232.00
1982 87.00 115.00 173.50 261.50 498.00 726.50 744.50 777.00 639.00 422.00 124.00 97.50 4665.50
1983 190.00 219.50 316.00 376.50 592.50 646.50 760.00 824.50 576.50 407.00 268.00 48.50 5225.50
1984 182.50 182.00 307.50 317.50 468.50 608.50 797.00 790.00 609.00 357.50 183.50 26.50 4830.00
1985 32.50 60.00 148.50 317.50 520.50 645.50 913.00 793.00 563.00 391.00 91.00 26.00 4501.50
1986 165.50 132.50 323.00 288.50 538.50 709.00 717.00 906.50 624.50 488.00 225.00 114.00 5232.00
1987 112.50 213.50 314.00 438.00 597.50 705.00 758.00 795.50 662.50 478.00 272.00 69.00 5415.50
1988 68.00 176.50 205.00 341.50 508.50 609.00 785.50 0.00 z 609.00 485.00 192.00 107.00 4087.00
1989 89.00 41.50 164.50 410.00 498.00 690.00 737.00 763.50 676.50 413.00 232.50 137.00 4852.50
1990 117.50 96.00 246.00 386.50 514.50 635.50 866.50 852.00 690.00 370.00 243.00 0.00 z 5017.50
1991 82.50 231.50 143.00 288.50 479.00 558.00 814.50 830.00 659.50 383.50 225.50 99.50 4795.00
1992 126.50 200.00 311.50 413.50 603.50 748.50 817.50 836.50 565.00 421.50 152.50 38.00 5234.50
1993 75.00 105.00 274.00 351.00 656.00 660.50 709.00 811.50 681.00 497.00 136.00 96.00 5052.00
1994 173.50 77.50 260.00 390.00 576.50 630.00 874.50 869.00 750.00 424.50 103.00 99.50 5228.00
1995 155.00 a 178.89 a 235.50 348.00 617.50 696.50 862.00 729.50 742.50 421.50 309.00 127.00 5422.89
1996 114.50 137.50 255.50 372.00 428.50 623.00 855.50 835.50 602.50 394.50 185.00 53.00 4857.00
1997 117.00 116.00 181.50 318.00 627.00 643.00 818.50 908.50 710.50 415.50 282.50 97.50 5235.50
1998 142.50 171.00 250.00 363.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 926.50
Period of Record Statistics
MEAN 109.58 140.92 231.50 343.52 525.02 644.50 792.59 804.35 647.82 423.14 198.10 101.04 4953.20
S.D. 46.89 53.24 65.31 50.31 64.38 50.95 53.44 64.07 57.12 39.38 63.24 44.89 277.90
SKEW -0.12 -0.03 -0.05 -0.33 0.29 0.32 0.37 -0.03 0.08 0.35 -0.18 0.12 0.12
MAX 190.00 231.50 323.00 438.00 656.00 748.50 913.00 911.00 750.00 497.00 309.00 207.50 5422.89
MIN 12.50 41.50 132.00 219.50 422.00 558.00 709.00 689.50 558.50 357.50 91.00 26.00 4501.50
NO YRS 26 26 26 26 25 25 25 24 25 25 25 25 23