CHIEF JOSEPH DAM, WASHINGTON

Monthly Total Growing Degree Days

(451400)

Base Temperature = 40 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1949 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 291.00 133.50 8.50 433.00
1950 0.00 b 3.00 62.50 269.00 583.00 535.50 k 691.50 k 763.00 i 557.50 i 312.21 c 31.50 g 7.50 k 1229.71
1951 0.00 i 3.50 42.50 325.00 598.50 764.00 1041.00 984.00 699.50 317.00 6.50 4.50 4786.00
1952 0.00 1.00 50.00 334.50 584.00 725.50 978.50 951.50 749.00 435.00 9.64 b 0.00 4818.64
1953 17.57 a 10.23 b 132.30 c 291.00 431.50 f 663.89 c 983.50 949.50 728.79 a 395.25 a 64.00 5.00 4241.03
1954 4.65 a 16.59 a 37.41 b 267.86 b 627.20 c 668.50 888.84 b 0.00 z 639.50 233.50 105.50 0.00 3489.55
1955 0.00 0.00 22.50 179.50 406.62 a 780.00 a 928.50 933.74 b 697.00 322.00 29.00 0.00 a 4298.86
1956 0.00 0.00 42.50 394.50 661.00 0.00 z 1062.00 910.50 650.50 284.50 29.48 a 7.50 4042.48
1957 0.00 5.00 74.50 355.00 702.50 798.50 937.00 881.50 832.00 324.50 33.00 0.50 4944.00
1958 0.00 26.00 110.00 303.50 844.50 967.50 1120.50 1116.00 659.50 364.00 50.00 5.50 5567.00
1959 1.00 0.00 102.00 338.00 518.00 771.00 1033.00 945.50 609.00 286.00 34.50 0.00 4638.00
1960 0.00 0.00 168.00 311.50 527.50 820.50 1195.00 933.00 725.50 414.00 30.50 0.00 5125.50
1961 6.00 15.50 119.50 338.50 566.50 905.00 1086.00 1128.50 634.50 293.00 17.50 0.00 5110.50
1962 0.00 1.50 84.50 408.50 520.50 778.00 979.50 934.00 762.50 366.00 99.00 15.00 4949.00
1963 1.00 29.50 151.00 278.00 609.00 789.50 958.50 993.50 860.50 451.00 76.00 0.00 5197.50
1964 0.00 0.00 0.00 z 316.00 554.00 763.00 991.50 873.50 612.00 319.50 37.00 0.00 4466.50
1965 0.50 4.50 75.00 383.50 569.00 791.50 1036.00 1008.50 612.50 401.00 104.50 2.00 4988.50
1966 0.00 1.00 118.00 368.00 608.50 695.00 941.00 995.50 817.00 336.50 62.00 11.50 4954.00
1967 3.50 47.50 89.00 236.00 580.50 820.50 1029.00 1115.50 910.50 355.00 78.00 0.50 5265.50
1968 0.00 37.00 140.00 262.00 576.00 762.93 a 1022.50 842.00 694.00 236.00 40.50 4.50 4617.43
1969 0.00 0.00 55.50 342.00 682.00 903.50 963.00 952.50 694.50 255.00 58.00 0.00 4906.00
1970 0.00 0.00 118.00 237.50 617.00 896.50 1073.00 1048.00 568.50 270.00 27.50 0.00 4856.00
1971 1.50 0.00 29.00 282.50 626.00 683.00 974.00 1085.00 553.50 293.50 32.50 0.00 4560.50
1972 0.00 18.50 126.00 196.50 582.50 714.50 0.00 z 1012.00 572.50 298.50 60.00 12.00 3593.00
1973 0.00 5.50 166.50 399.50 643.50 0.00 z 1093.50 1073.00 715.00 314.50 13.50 0.00 z 4424.50
1974 20.50 3.00 103.50 334.50 483.00 616.50 g 935.00 1031.78 a 734.00 317.50 37.00 3.50 4003.28
1975 0.00 0.00 11.50 219.00 527.00 726.50 1155.00 911.00 730.50 310.00 96.50 17.50 4704.50
1976 0.00 12.43 a 89.50 290.00 542.50 684.00 980.00 886.00 789.00 319.50 63.00 0.00 4655.93
1977 0.00 0.00 z 128.50 451.50 509.00 939.50 1026.00 1180.50 598.50 313.00 56.00 3.50 5206.00
1978 0.00 0.00 176.50 319.50 546.50 869.50 1080.00 991.50 626.00 323.00 25.80 e 0.00 d 4958.30
1979 0.00 3.50 153.00 305.50 665.50 891.72 a 1113.00 1072.50 778.50 454.50 22.00 6.00 5465.72
1980 0.00 0.00 67.00 401.50 637.50 680.50 977.50 896.00 690.50 351.00 73.33 c 16.50 4791.33
1981 5.00 38.50 205.50 318.00 582.00 649.00 961.00 1133.00 708.50 293.00 74.00 8.50 4976.00
1982 2.50 15.50 85.00 221.50 558.00 908.00 942.00 997.50 683.00 306.00 14.00 3.00 4736.00
1983 3.00 12.00 188.50 318.00 651.00 775.00 858.00 1053.00 585.00 279.50 85.50 0.00 4808.50
1984 0.50 1.50 174.50 287.00 481.00 718.00 997.50 1025.50 570.50 249.50 27.00 0.00 4532.50
1985 0.00 0.00 33.50 401.00 703.00 852.50 1233.50 982.00 579.50 315.50 27.50 0.00 5128.00
1986 0.00 10.50 188.00 319.00 639.50 959.00 962.00 1185.50 610.00 404.50 86.00 0.00 5364.00
1987 0.00 7.50 184.00 495.50 710.50 917.00 1013.50 1037.50 859.00 403.50 110.00 23.50 5761.50
1988 1.50 28.50 167.50 444.50 609.00 803.00 1083.50 1022.50 758.50 481.00 74.50 3.00 5477.00
1989 9.50 0.00 100.00 419.00 618.00 936.00 1047.00 963.00 737.50 343.50 100.50 0.00 5274.00
1990 13.50 11.00 170.50 473.50 570.50 756.00 1136.00 1091.50 888.00 300.00 156.50 7.00 5574.00
1991 0.00 55.50 0.00 z 363.50 597.00 717.00 1107.00 1127.50 854.50 333.50 37.00 7.50 5200.00
1992 13.00 49.50 297.50 410.00 744.50 1009.00 1035.00 1038.00 701.50 364.50 49.00 0.00 5711.50
1993 0.00 0.00 64.00 258.50 754.00 758.50 850.00 940.50 685.50 406.50 12.00 3.00 4732.50
1994 0.00 9.00 181.50 350.00 612.00 750.50 1143.50 1015.00 781.00 308.50 5.00 0.00 5156.00
1995 0.00 36.50 137.50 351.50 721.00 820.00 1086.00 885.50 815.00 319.50 75.50 11.50 5259.50
1996 1.00 6.00 95.50 350.50 492.50 755.50 1127.50 1070.00 680.00 318.00 36.00 0.00 4932.50
1997 0.00 0.00 116.50 313.00 645.00 824.00 1139.50 1201.50 850.00 403.00 a 79.00 2.00 5573.50
1998 0.00 24.00 174.50 379.00 667.00 843.00 1195.50 1122.00 896.50 327.50 118.00 6.50 5753.50
1999 3.50 19.00 122.00 305.50 482.50 751.00 969.50 1091.00 675.00 310.50 99.50 4.50 4833.50
2000 0.00 0.00 117.50 417.00 567.00 831.00 1018.00 999.00 654.00 293.50 20.00 0.00 a 4917.00
2001 0.00 0.00 124.50 328.50 675.00 735.50 1032.50 1093.50 796.00 287.50 75.00 1.00 5149.00
2002 5.00 17.00 80.00 338.00 557.50 832.00 1114.00 1000.50 708.50 277.00 67.00 10.50 5007.00
2003 0.50 12.50 187.00 319.00 566.50 881.50 1157.00 1079.50 790.00 457.50 13.00 0.00 5464.00
2004 0.00 0.50 230.00 431.00 618.50 882.00 1133.00 1132.00 681.00 381.00 30.50 0.00 5519.50
2005 2.00 12.00 200.50 381.50 664.00 763.00 1062.50 1062.50 699.00 391.00 3.00 0.00 5241.00
2006 6.50 7.50 105.00 347.00 630.50 841.00 1159.50 1020.50 736.50 360.00 49.00 2.00 5265.00
2007 5.00 17.00 192.50 319.50 653.00 771.50 1179.00 1004.00 701.50 279.00 53.00 10.00 5185.00
2008 0.00 z 13.50 85.50 213.00 670.00 740.50 1069.00 991.50 680.00 321.00 71.50 0.00 4855.50
2009 3.50 0.00 62.00 287.50 629.00 875.50 1136.00 1071.50 777.50 225.50 41.50 0.00 5109.50
2010 0.50 10.50 158.00 320.50 454.50 654.50 1034.00 966.50 677.00 383.00 38.50 0.00 4697.50
2011 4.00 0.00 75.00 174.00 422.00 622.00 785.50 1108.50 807.93 a 330.50 19.50 1.50 4350.43
2012 0.00 4.50 78.00 328.00 523.50 654.00 1066.00 1134.17 b 753.00 358.00 97.24 a 31.52 a 5027.93
2013 0.00 0.50 121.00 18.00 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 121.50
Period of Record Statistics
MEAN 2.20 10.55 118.52 328.93 599.48 793.90 1039.60 1021.01 714.92 333.89 54.77 4.20 5056.66
S.D. 4.30 13.64 57.49 69.43 81.32 90.56 91.86 84.90 89.19 57.01 34.72 6.33 354.49
SKEW 2.64 1.60 0.42 -0.01 0.13 0.26 -0.26 0.02 0.24 0.56 0.64 2.14 0.12
MAX 20.50 55.50 297.50 495.50 844.50 1009.00 1233.50 1201.50 910.50 481.00 156.50 31.52 5761.50
MIN 0.00 0.00 11.50 174.00 406.62 622.00 785.50 842.00 553.50 225.50 3.00 0.00 4298.86
NO YRS 62 63 62 63 62 59 61 61 62 64 63 62 51