SPOKANE WSO AIRPORT, WASHINGTON

Monthly Total Growing Degree Days

(457938)

Base Temperature = 40 F

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 200603
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
1889 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 813.50 494.48 a 386.00 13.50 0.00 1707.48
1890 0.00 1.50 20.50 288.50 560.50 615.50 877.50 887.50 599.50 240.50 26.00 20.50 4138.00
1891 11.50 0.00 36.50 300.00 594.50 606.50 924.00 927.50 608.00 376.00 98.50 1.00 4484.00
1892 0.50 14.50 143.00 128.50 457.00 676.00 805.00 880.50 613.00 341.50 76.00 0.00 4135.50
1893 7.50 0.00 31.50 114.50 423.00 527.50 845.00 879.50 577.00 174.50 52.50 5.50 3638.00
1894 9.50 3.00 42.00 216.00 535.00 618.50 932.00 973.50 510.50 264.50 111.00 0.00 4215.50
1895 5.50 23.00 65.00 302.00 455.00 662.50 848.00 853.50 414.00 331.50 45.50 14.50 4020.00
1896 19.00 42.50 91.50 157.50 323.00 687.50 1029.00 888.00 552.50 305.00 51.50 13.50 4160.50
1897 2.50 0.00 15.50 313.00 693.50 650.00 781.00 998.00 534.50 243.50 51.50 12.00 4295.00
1898 0.00 45.50 28.50 300.00 468.00 691.00 910.00 1029.50 614.00 211.00 28.50 8.00 4334.00
1899 11.00 11.00 24.00 187.50 359.50 612.50 928.50 674.50 674.00 219.00 156.50 21.00 3879.00
1900 18.00 13.00 186.00 335.00 540.00 780.50 918.00 745.00 547.00 254.00 24.00 36.00 4396.50
1901 3.50 16.00 68.50 186.50 554.50 504.50 855.00 1013.50 450.50 431.50 74.50 12.00 4170.50
1902 26.50 29.50 46.00 199.00 479.00 621.00 772.50 826.50 542.00 350.50 22.50 2.00 3917.00
1903 6.50 1.00 84.00 159.50 439.00 799.00 791.00 845.00 463.50 284.00 68.00 4.00 3944.50
1904 10.50 0.00 17.00 312.50 483.50 655.00 924.00 944.50 620.00 337.50 131.50 2.50 4438.50
1905 1.00 34.00 137.50 289.50 438.00 633.50 965.00 901.00 615.00 137.50 17.50 0.00 4169.50
1906 3.00 17.00 97.50 370.00 491.00 568.00 1113.50 881.00 628.50 333.00 67.50 1.50 4571.50
1907 0.00 14.00 28.00 186.50 541.00 614.50 897.00 713.00 519.50 426.00 56.50 5.00 4001.00
1908 0.00 3.50 72.00 273.50 397.00 650.00 985.00 871.50 627.00 255.00 121.50 1.50 4257.50
1909 4.50 12.00 99.50 155.00 424.50 671.00 802.50 827.50 645.50 273.50 91.00 1.50 4008.00
1910 9.00 0.00 205.50 362.50 599.50 640.50 980.50 781.00 571.00 336.50 60.00 1.50 4547.50
1911 0.00 0.00 146.00 225.00 387.00 719.50 952.50 814.00 496.50 261.50 36.00 2.00 4040.00
1912 7.00 10.50 61.00 245.50 512.50 748.50 825.50 752.00 478.00 176.50 72.00 1.50 3890.50
1913 0.00 6.50 17.00 245.00 482.50 693.00 864.00 888.50 570.00 172.50 69.00 0.00 4008.00
1914 24.50 14.00 124.50 288.00 573.50 627.50 1010.00 931.50 529.00 299.50 89.00 0.00 4511.00
1915 0.00 11.50 167.50 385.00 481.00 639.50 888.50 1092.00 540.50 338.50 26.50 8.50 4579.00
1916 0.00 15.50 108.50 252.00 359.50 619.00 827.00 899.50 589.00 216.00 32.50 0.50 3919.00
1917 0.00 3.50 2.50 139.50 457.50 604.50 1017.50 974.00 668.50 346.50 90.00 65.50 4369.50
1918 12.00 18.00 132.50 306.00 420.00 847.00 982.00 801.50 745.00 384.00 46.00 25.00 4719.00
1919 28.50 0.00 84.50 302.00 478.50 672.50 986.50 924.50 562.50 194.00 37.00 12.50 4283.00
1920 10.00 0.00 54.00 169.50 404.50 625.50 1060.50 924.00 577.00 247.00 48.50 11.00 4131.50
1921 10.00 30.00 79.00 175.00 517.50 774.00 922.50 937.50 436.50 335.00 51.00 25.50 4293.50
1922 0.00 4.50 18.00 156.00 453.50 896.00 1028.00 959.00 680.50 370.00 14.50 12.00 4592.00
1923 7.50 0.00 78.00 246.50 483.00 651.50 992.00 923.00 669.00 327.00 41.00 4.50 4423.00
1924 9.00 51.00 31.00 232.00 688.00 734.00 970.50 861.00 621.50 303.00 25.00 35.00 4561.00
1925 8.00 37.50 83.50 357.00 607.50 774.00 1082.00 912.50 609.50 207.00 20.50 19.50 4718.50
1926 0.50 41.00 141.00 437.50 514.50 765.50 1063.00 863.50 410.00 323.50 69.50 15.50 4645.00
1927 2.50 8.00 50.00 210.50 392.00 729.00 973.00 938.00 523.50 322.00 48.50 10.00 4207.00
1928 2.50 1.00 122.00 188.00 668.50 707.50 1040.00 880.00 647.50 295.00 27.00 8.00 4587.00
1929 0.00 0.00 79.00 172.00 520.50 658.00 948.00 1024.50 533.50 365.00 10.00 15.50 4326.00
1930 6.00 47.00 114.50 414.00 466.00 636.00 1020.00 1017.50 657.50 204.00 49.50 0.00 4632.00
1931 16.00 9.00 110.50 278.00 622.00 717.00 1018.50 968.00 619.00 291.00 45.50 2.00 4696.50
1932 0.00 40.00 84.00 299.00 487.00 791.50 902.50 919.00 637.50 291.50 91.50 12.50 4556.00
1933 8.50 0.50 45.50 261.50 387.50 719.00 986.50 939.50 502.50 369.00 50.50 58.00 4328.50
1934 25.00 34.00 223.00 494.00 658.50 760.50 971.00 961.00 526.50 356.00 133.00 6.00 5148.50
1935 28.00 6.00 38.00 187.50 492.00 671.00 936.50 850.00 713.00 292.00 6.00 0.00 4220.00
1936 0.00 7.00 55.50 410.00 682.00 764.00 1015.50 961.50 573.50 376.50 6.50 27.50 4879.50
1937 0.00 0.00 89.50 199.50 536.50 699.00 1006.00 810.50 678.50 389.50 68.00 15.00 4492.00
1938 2.00 0.00 65.50 293.50 522.50 803.50 1085.50 862.50 833.50 346.50 24.00 23.00 4862.00
1939 15.00 0.00 137.00 345.50 588.50 625.00 1002.50 1011.00 662.50 307.00 56.50 46.50 4797.00
1940 2.50 9.50 175.50 316.50 635.50 848.50 1017.50 950.00 740.00 402.00 17.50 12.00 5127.00
1941 1.00 24.50 186.00 356.00 487.00 676.00 1050.50 883.00 467.00 237.50 74.00 41.00 4483.50
1942 0.00 2.00 57.00 294.50 402.50 587.00 965.00 939.50 655.50 325.50 14.00 0.00 4242.50
1943 0.00 0.00 62.00 311.00 385.00 560.00 907.00 830.50 677.00 324.00 22.50 16.00 4095.00
1944 1.50 2.50 41.00 238.00 522.00 678.00 920.00 829.00 649.50 442.00 53.00 11.50 4388.00
1945 15.00 13.50 33.00 158.00 524.50 614.00 958.00 912.00 499.50 349.00 45.00 11.00 4132.50
1946 1.00 4.00 58.50 239.00 528.50 614.00 910.00 885.00 564.50 164.50 10.00 23.00 4002.00
1947 7.00 32.00 133.00 255.00 609.50 644.00 932.50 828.00 570.50 333.50 14.00 0.50 4359.50
1948 0.00 8.00 24.00 129.00 399.00 757.50 778.00 780.00 544.00 245.00 5.00 0.00 3669.50
1949 0.00 2.00 30.00 277.00 591.00 654.00 885.50 884.50 646.00 153.50 82.50 3.50 4209.50
1950 0.00 3.50 14.00 120.50 380.50 629.00 900.50 934.00 659.50 210.50 23.50 19.00 3894.50
1951 0.00 12.00 30.50 261.00 449.00 637.50 960.00 876.00 605.50 205.00 10.00 0.00 4046.50
1952 0.00 0.00 41.50 298.00 511.00 629.00 932.00 880.00 713.00 448.00 13.50 0.00 4466.00
1953 36.00 5.50 61.50 181.00 385.50 516.00 906.00 868.00 651.00 358.50 63.50 0.00 4032.50
1954 3.00 9.50 15.50 122.00 480.00 513.50 850.50 757.00 524.50 194.00 97.50 0.00 3567.00
1955 0.00 0.00 6.00 62.00 291.50 679.00 817.50 878.00 583.00 232.00 16.00 1.00 3566.00
1956 1.50 0.00 42.00 303.50 560.50 568.00 979.50 856.50 620.00 219.50 3.00 3.00 4157.00
1957 0.00 15.50 27.50 240.00 598.00 662.00 851.00 792.00 684.50 179.50 10.50 7.00 4067.50
1958 1.00 52.50 49.00 147.00 702.50 767.50 1021.50 1043.00 560.50 316.50 49.00 11.50 4721.50
1959 9.00 1.00 25.50 222.00 326.50 651.00 949.00 755.50 452.00 192.00 33.50 3.50 3620.50
1960 1.50 0.00 111.50 188.00 347.00 664.00 1086.00 777.50 608.50 270.00 8.00 0.00 4062.00
1961 8.50 14.00 72.50 167.00 401.50 799.00 988.00 1054.00 477.00 202.00 3.50 0.00 4187.00
1962 0.00 10.50 19.50 295.00 336.50 633.00 873.00 787.00 620.50 235.50 36.50 2.50 3849.50
1963 1.00 30.50 68.00 162.50 458.50 651.50 827.50 901.00 780.00 351.00 30.50 0.00 4262.00
1964 0.00 0.00 39.00 143.00 399.00 611.00 871.50 705.50 455.50 256.50 14.50 5.50 3501.00
1965 0.00 8.50 33.00 221.00 384.50 638.50 934.00 865.00 413.00 393.00 44.00 1.00 3935.50
1966 3.50 0.50 83.50 197.00 492.00 564.00 873.00 872.00 736.00 230.00 15.00 13.50 4080.00
1967 8.00 15.00 29.00 79.50 400.50 704.50 948.50 1067.50 759.50 266.50 21.50 0.00 4300.00
1968 2.00 53.50 89.00 123.50 427.00 633.50 962.50 776.00 567.00 163.50 6.00 5.50 3809.00
1969 0.00 0.00 53.50 189.50 541.50 754.00 847.50 838.50 593.50 129.50 38.50 1.00 3987.00
1970 0.00 2.50 27.00 65.50 462.50 784.00 1007.50 935.00 425.50 181.50 40.00 1.50 3932.50
1971 32.00 14.00 15.00 163.50 505.00 546.00 922.00 1055.50 455.00 211.00 11.00 0.00 3930.00
1972 4.00 19.50 112.00 88.50 522.50 658.50 870.00 962.50 462.00 261.00 34.50 28.00 4023.00
1973 12.00 18.00 57.00 191.50 512.50 659.50 967.00 900.00 590.00 230.00 23.50 4.00 4165.00
1974 14.00 0.00 42.50 191.00 314.00 780.50 863.00 872.50 612.50 251.50 19.00 0.50 3961.00
1975 0.00 0.00 3.50 87.50 393.00 574.50 1003.00 747.00 629.00 232.00 62.00 14.50 3746.00
1976 0.50 0.00 19.00 172.00 450.50 554.00 893.00 788.00 702.00 222.00 36.00 1.00 3838.00
1977 0.00 22.50 19.00 332.00 358.50 749.50 837.50 965.50 451.50 210.50 24.00 12.00 3982.50
1978 0.00 2.50 143.00 168.50 354.00 681.50 875.00 801.50 498.00 237.50 13.50 0.00 3775.00
1979 0.00 2.00 69.50 176.50 457.00 679.50 943.00 928.00 692.50 346.50 5.50 24.50 4324.50
1980 0.00 23.50 28.00 353.00 488.50 534.50 904.00 746.00 551.50 247.00 58.00 37.00 3971.00
1981 2.50 28.50 57.50 197.50 370.00 508.50 776.00 975.00 591.50 185.50 63.50 11.50 3767.50
1982 0.00 48.00 56.00 130.00 440.00 794.00 854.00 923.50 582.50 207.50 15.00 7.00 4057.50
1983 24.00 51.00 102.00 198.00 528.50 656.50 788.50 1000.50 512.50 300.00 69.50 0.00 4231.00
1984 9.00 2.50 73.50 128.50 311.00 574.00 900.50 931.50 500.50 208.00 15.00 0.00 3654.00
1985 0.00 0.00 24.50 247.00 500.00 652.00 1083.50 772.00 399.00 178.50 21.00 0.00 3877.50
1986 0.00 36.00 98.00 153.50 475.50 785.50 744.00 1010.00 442.00 277.50 14.00 0.00 4036.00
1987 0.00 0.50 86.00 332.50 531.50 751.00 825.00 812.50 681.50 293.50 70.00 12.50 4396.50
1988 0.00 30.00 37.00 270.50 451.50 633.00 889.00 879.50 567.50 428.00 45.50 0.50 4232.00
1989 5.50 0.00 44.50 274.50 405.00 728.00 890.00 769.00 602.50 235.50 58.00 5.00 4017.50
1990 5.00 5.00 81.50 291.00 396.00 619.00 941.00 883.00 757.00 161.00 71.50 0.50 4211.50
1991 0.00 15.50 24.00 182.00 360.50 496.00 889.00 936.50 654.00 282.00 19.00 2.50 3861.00
1992 14.00 29.00 175.00 274.00 583.50 838.50 859.50 916.00 520.00 304.50 8.00 0.00 4522.00
1993 0.00 0.00 41.50 164.00 612.00 604.50 625.50 749.00 560.50 310.50 8.00 6.50 3682.00
1994 7.00 6.00 117.50 273.00 515.00 623.00 1022.00 911.50 702.00 217.00 2.50 6.50 4403.00
1995 10.00 64.50 72.50 172.00 519.00 602.00 862.50 739.00 636.50 160.00 91.00 2.50 3931.50
1996 6.00 9.00 30.00 191.50 297.50 614.50 929.50 869.00 478.00 212.00 9.50 1.50 3648.00
1997 2.00 1.00 64.50 128.00 518.00 598.00 854.00 959.00 656.00 228.00 33.50 0.00 4042.00
1998 2.50 26.50 101.00 240.00 500.00 675.00 1093.00 981.50 752.50 220.50 44.00 8.50 4645.00
1999 6.00 7.50 79.50 161.50 332.00 597.50 811.00 939.00 574.00 233.50 92.00 2.00 3835.50
2000 0.00 1.50 24.50 251.00 403.50 629.50 862.50 854.00 473.50 204.50 0.00 0.00 3704.50
2001 0.00 0.00 45.50 147.00 477.00 560.00 880.50 963.00 698.00 187.00 75.00 0.00 4033.00
2002 6.50 7.00 18.50 173.50 366.00 668.00 971.00 819.00 554.00 172.00 45.50 19.50 3820.50
2003 14.50 2.00 86.50 168.00 414.50 708.00 1022.50 938.50 657.00 384.00 8.50 0.00 4404.00
2004 0.00 5.50 133.00 286.50 450.50 708.00 999.00 960.50 540.00 291.00 20.00 5.00 4399.00
2005 6.50 10.00 86.00 240.50 521.50 607.00 933.00 917.00 524.50 277.50 3.50 6.00 4133.00
2006 4.00 3.50 46.00 218.50 517.50 713.00 684.50 j 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1502.50
Period of Record Statistics
MEAN 5.66 12.83 69.53 229.33 475.83 665.32 925.48 887.79 585.27 273.82 42.18 8.88 4182.34
S.D. 7.79 15.35 47.49 83.53 92.18 81.13 86.15 85.60 91.21 75.37 32.12 12.15 335.53
SKEW 1.82 1.35 0.99 0.45 0.29 0.33 -0.24 -0.09 0.10 0.29 1.03 2.19 0.38
MAX 36.00 64.50 223.00 494.00 702.50 896.00 1113.50 1092.00 833.50 448.00 156.50 65.50 5148.50
MIN 0.00 0.00 2.50 62.00 291.50 496.00 625.50 674.50 399.00 129.50 0.00 0.00 3501.00
NO YRS 117 117 117 117 117 117 116 117 117 117 117 117 116