SEATTLE CITY OFFICE, WASHINGTON

Monthly Total Growing Degree Days

(457488)

Base Temperature = 40 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 197210
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 714.50 756.50 714.55 a 588.00 385.00 148.00 27.50 3334.05
1949 7.50 78.50 231.50 355.00 592.00 622.50 727.00 762.00 676.50 341.50 345.00 98.00 4837.00
1950 16.50 129.50 150.50 290.50 435.50 657.00 796.50 807.50 631.00 387.00 209.00 247.50 4758.00
1951 66.50 118.00 126.00 404.00 525.00 714.31 a 819.50 753.00 657.00 421.50 234.00 51.00 4889.81
1952 72.50 122.50 175.50 363.50 520.50 567.00 790.50 797.50 695.50 533.00 192.00 157.50 4987.50
1953 224.50 116.50 191.00 309.00 502.00 554.00 786.00 797.00 663.50 489.00 290.00 151.50 5074.00
1954 60.50 145.00 147.50 261.00 521.00 542.00 689.50 681.50 616.00 418.00 340.00 136.00 4558.00
1955 82.00 61.50 84.00 216.50 405.00 586.50 682.50 719.50 595.50 402.00 148.00 80.50 4063.50
1956 93.50 30.50 123.50 366.50 608.00 566.50 827.00 783.00 604.50 389.00 177.50 144.50 4714.00
1957 20.00 97.50 206.00 368.00 632.00 665.50 731.50 762.50 768.00 429.87 a 189.50 186.50 5056.87
1958 191.50 281.50 228.50 366.00 689.50 772.00 950.00 884.00 665.50 503.00 189.00 228.50 5949.00
1959 140.50 113.50 194.50 361.50 500.50 657.00 861.00 757.50 578.50 439.50 213.00 121.50 4938.50
1960 101.00 150.00 207.50 371.50 476.00 646.50 856.00 725.00 604.00 468.50 210.00 109.00 4925.00
1961 211.50 192.00 246.50 307.00 515.50 740.50 861.50 906.00 627.00 408.50 158.50 103.50 5278.00
1962 117.50 189.00 182.38 a 391.00 441.00 636.00 778.00 770.50 664.00 486.50 274.00 189.50 5119.38
1963 43.50 289.50 212.00 320.00 574.50 597.50 730.50 784.00 734.50 499.00 230.50 153.50 5169.00
1964 112.00 122.00 194.50 287.50 486.50 606.50 0.00 z 754.50 618.00 492.50 161.00 69.00 3904.00
1965 97.00 129.50 275.50 373.50 453.50 674.00 839.50 805.00 590.50 536.00 342.50 135.00 5251.50
1966 0.00 z 171.50 260.50 378.00 528.50 634.50 758.00 816.50 709.00 452.50 272.00 227.00 5208.00
1967 158.50 164.50 157.50 271.00 548.50 757.00 846.00 946.00 790.00 491.50 298.00 139.50 5568.00
1968 130.50 308.50 316.00 317.00 576.00 656.50 882.00 769.50 637.50 444.00 286.00 98.50 5422.00
1969 28.50 96.50 260.50 319.50 617.50 749.00 771.50 728.50 631.00 433.50 233.50 185.00 5054.50
1970 111.50 234.50 254.50 290.00 536.00 729.50 813.50 788.50 598.00 385.00 241.00 61.00 5043.00
1971 118.50 98.50 120.50 325.50 497.50 543.50 806.50 880.50 616.50 368.50 210.50 35.50 4622.00
1972 58.50 121.50 257.50 242.50 586.00 603.00 803.00 813.00 534.50 359.00 0.00 z 0.00 z 4378.50
Period of Record Statistics
MEAN 98.43 148.42 200.16 327.31 532.00 647.71 798.48 788.28 643.76 438.53 233.02 130.69 5013.26
S.D. 59.90 70.74 57.53 49.73 68.27 70.10 62.88 62.30 60.21 54.95 60.91 60.66 387.19
SKEW 0.46 0.86 -0.09 -0.47 0.27 0.19 0.17 0.83 0.77 0.11 0.43 0.15 0.03
MAX 224.50 308.50 316.00 404.00 689.50 772.00 950.00 946.00 790.00 536.00 345.00 247.50 5949.00
MIN 7.50 30.50 84.00 216.50 405.00 542.00 682.50 681.50 534.50 341.50 148.00 27.50 4063.50
NO YRS 23 24 24 24 24 25 24 25 25 25 24 24 21