SWAN FALLS POWER HOUSE, IDAHO

Monthly Total Growing Degree Days

(108928)

Base Temperature = 50 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
1935 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 906.75 a 832.57 c 616.00 244.50 0.00 0.00 2599.82
1936 0.00 16.00 n 4.17 e 260.50 526.48 a 689.50 1018.57 c 916.10 b 471.43 b 245.42 a 0.00 a 0.00 4132.18
1937 0.00 a 0.00 a 7.23 a 69.00 432.50 571.50 1005.50 830.50 590.00 239.00 17.00 0.52 a 3762.75
1938 0.00 c 0.00 c 5.68 a 136.00 307.70 d 607.50 b 905.95 b 822.02 a 669.31 a 201.50 a 3.00 0.00 3658.66
1939 0.00 0.00 71.00 211.50 463.50 508.50 943.00 922.50 529.50 205.00 2.50 15.50 3872.50
1940 0.00 15.00 55.00 120.00 483.00 783.50 972.37 a 931.50 516.00 225.50 1.50 0.00 4103.37
1941 0.00 1.04 a 39.27 a 126.00 387.00 521.00 953.25 a 793.50 395.50 163.00 30.00 b 5.00 3414.55
1942 0.00 0.00 6.20 a 183.50 225.50 446.00 966.17 a 858.00 536.00 235.00 20.00 0.00 3476.37
1943 0.00 0.00 30.50 241.00 287.02 b 438.00 828.73 a 806.50 605.00 244.00 0.00 0.00 3480.75
1944 0.00 0.00 4.50 79.00 397.50 400.86 a 821.00 793.50 513.50 306.50 5.00 0.00 a 3321.36
1945 0.00 d 0.00 a 4.13 a 76.50 326.50 459.31 a 924.83 a 855.60 a 404.00 297.50 11.00 0.00 3359.38
1946 0.00 0.00 33.00 211.11 c 410.75 c 618.50 940.50 847.50 426.00 71.50 4.00 2.00 3564.86
1947 0.00 a 0.50 65.50 155.00 514.50 468.50 960.50 824.00 484.00 240.25 a 13.50 0.00 3726.25
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 777.00 481.50 218.00 8.50 0.00 b 1485.00
1949 0.00 0.00 17.16 c 251.90 a 482.10 b 616.50 932.00 876.00 599.00 84.00 18.00 0.00 3876.66
1950 0.00 9.00 19.50 115.50 324.98 a 570.00 911.00 862.50 539.50 312.50 20.50 0.00 3684.98
1951 0.00 5.19 a 8.50 202.50 374.00 557.50 977.00 836.00 553.50 149.00 3.00 1.50 3667.69
1952 0.00 0.00 3.50 232.00 411.50 589.50 911.50 913.50 616.00 335.50 0.00 0.00 4013.00
1953 23.50 6.50 37.50 139.50 245.00 467.50 981.50 872.65 a 640.50 268.50 51.72 a 0.00 3734.37
1954 2.00 7.00 21.00 208.00 507.00 491.00 969.27 a 741.50 536.79 b 193.00 25.71 b 1.50 3703.77
1955 0.00 0.00 4.00 57.86 b 342.07 b 655.34 a 845.00 958.70 d 584.46 b 261.36 b 14.50 8.50 3731.80
1956 0.00 1.00 60.50 g 209.50 454.31 b 625.00 943.00 801.50 575.50 192.50 0.50 0.00 c 3802.81
1957 0.00 14.00 22.45 b 111.72 a 393.50 666.72 a 923.50 832.50 610.00 136.50 4.00 3.50 3718.40
1958 0.00 26.00 17.00 107.50 613.00 650.00 914.50 969.50 544.50 297.00 29.00 0.00 4168.00
1959 5.50 0.00 15.50 222.50 271.00 755.00 1006.50 832.50 440.50 199.00 4.00 0.00 3752.00
1960 0.00 0.00 84.00 195.00 348.50 752.50 1090.50 775.00 641.00 197.50 15.50 0.00 4099.50
1961 0.00 14.00 48.50 140.00 443.50 860.00 1016.50 1000.50 383.00 191.68 a 2.50 0.00 4100.18
1962 1.50 0.00 20.50 272.00 338.50 627.00 858.00 816.50 585.00 194.50 36.00 0.00 3749.50
1963 0.00 13.00 59.50 115.00 468.50 542.00 858.50 881.50 673.50 350.00 18.00 0.00 3979.50
1964 0.00 0.00 12.50 108.10 a 378.00 530.00 962.00 800.00 472.00 256.00 11.50 16.00 3546.10
1965 1.50 5.50 20.50 192.50 336.50 596.00 877.00 765.00 373.50 296.00 52.00 0.00 3516.00
1966 5.50 0.00 75.00 189.00 533.00 607.00 924.00 879.00 653.50 174.00 36.00 0.00 4076.00
1967 8.50 5.50 31.00 28.50 408.00 606.00 1042.50 1009.00 693.62 a 195.50 19.00 0.00 4047.12
1968 0.00 16.50 78.50 132.00 395.00 685.50 981.50 692.50 515.00 190.00 0.50 1.00 3688.00
1969 0.00 0.00 40.50 198.00 541.00 632.00 929.50 911.00 579.50 79.00 15.50 0.00 3926.00
1970 8.00 2.50 10.00 48.50 391.00 677.50 727.00 g 949.00 386.50 134.00 12.00 0.00 2619.00
1971 1.50 6.50 22.00 116.50 432.50 568.50 906.50 1010.00 406.00 182.00 3.50 0.00 3655.50
1972 0.00 8.00 77.50 112.00 444.00 661.50 880.00 891.50 383.50 211.00 3.50 3.00 3675.50
1973 0.00 1.00 13.00 130.34 a 491.50 675.50 954.00 877.00 491.00 209.50 28.00 0.00 3870.84
1974 4.00 0.00 a 24.00 133.50 361.50 801.72 a 893.00 843.50 619.62 d 208.50 14.00 f 0.00 3889.34
1975 0.00 1.00 9.00 39.00 340.00 574.50 1004.50 769.50 582.50 231.50 27.00 3.00 3581.50
1976 0.00 6.50 17.00 106.00 503.00 585.50 942.00 698.50 547.50 187.00 22.00 0.00 3615.00
1977 0.00 0.50 20.00 310.50 284.00 786.00 887.50 881.00 504.00 188.00 7.00 2.58 a 3871.08
1978 0.00 0.00 143.50 112.50 d 312.50 627.50 885.00 839.50 488.00 249.50 12.50 0.50 3671.00
1979 0.00 0.00 42.50 148.00 447.50 699.00 959.50 837.00 652.50 275.00 0.00 0.00 j 4061.00
1980 3.00 14.00 15.00 268.00 377.00 539.00 905.00 775.50 511.00 209.50 40.00 3.50 3660.50
1981 0.00 5.00 24.50 180.50 320.00 587.00 888.50 954.50 589.00 108.00 28.00 6.00 3691.00
1982 0.00 3.50 17.50 105.50 360.50 652.50 788.50 872.00 0.00 z 174.00 1.00 0.00 2975.00
1983 0.00 3.50 42.00 82.50 369.50 593.50 802.00 912.50 516.50 198.00 50.00 0.00 3570.00
1984 0.00 0.00 12.00 85.50 321.50 463.50 933.50 945.00 448.00 162.50 19.00 0.00 c 3390.50
1985 0.00 0.00 6.50 282.00 480.50 525.50 i 1075.50 799.00 346.50 145.50 8.50 0.00 3144.00
1986 0.00 35.50 116.50 124.00 426.50 826.00 817.50 981.00 383.00 202.00 5.00 c 0.00 3917.00
1987 0.00 0.00 56.00 0.00 z 546.00 748.50 809.00 804.00 577.00 263.00 23.50 9.00 3836.00
1988 0.00 6.50 58.00 248.00 408.00 748.50 949.50 761.50 485.50 440.50 38.50 0.00 4144.50
1989 0.00 0.00 60.00 265.00 378.50 733.00 999.00 778.00 558.00 203.00 5.00 0.00 3979.50
1990 1.00 0.00 74.00 324.00 324.00 646.00 944.00 857.00 702.00 199.50 4.00 0.00 4075.50
1991 0.00 2.50 34.00 125.50 302.00 551.00 953.50 964.50 576.50 251.50 0.00 0.00 3761.00
1992 0.50 4.50 71.00 276.50 575.05 a 678.50 753.50 923.00 540.50 273.50 8.00 0.00 4104.55
1993 0.00 0.00 30.50 107.50 531.00 507.50 622.50 710.00 546.50 214.00 2.00 1.50 3273.00
1994 0.00 4.00 87.00 205.50 501.50 696.00 1001.50 943.50 625.00 178.50 4.00 0.00 4246.50
1995 0.00 22.00 39.00 124.50 352.50 541.50 875.00 769.00 584.00 70.50 l 22.50 10.50 3340.50
1996 0.00 2.00 23.00 113.50 289.00 618.00 915.50 813.50 433.00 236.50 22.00 2.50 3468.50
1997 2.00 0.00 0.00 z 108.50 472.00 581.00 819.00 862.00 589.66 a 159.00 3.50 0.00 3596.66
1998 0.50 1.50 46.00 109.00 296.00 0.00 z 0.00 z 922.00 651.00 162.00 7.50 2.50 2198.00
1999 0.00 1.00 31.00 89.00 281.67 b 580.50 825.12 a 862.50 494.50 198.83 b 54.50 0.00 3418.62
2000 2.00 3.00 14.00 242.00 409.50 670.50 903.28 b 887.12 a 444.44 c 0.00 z 117.00 0.00 b 3692.84
2001 0.00 0.00 64.50 133.00 495.48 a 657.12 d 846.96 c 956.50 628.89 c 180.12 b 31.50 0.00 3994.07
2002 0.00 0.00 27.50 164.00 412.00 708.62 a 1011.00 613.00 f 519.50 125.55 a 3.50 0.00 2971.67
2003 1.00 1.50 71.00 125.00 414.00 700.50 1042.00 915.50 543.00 328.50 1.50 1.50 4145.00
2004 0.00 1.00 121.50 202.50 368.00 648.50 940.00 855.08 a 467.00 218.00 0.00 a 0.00 3821.58
2005 0.00 0.00 40.00 118.00 370.50 496.50 932.50 902.88 c 443.00 177.00 9.50 0.00 3489.88
2006 0.00 1.00 16.50 156.50 413.00 718.50 1040.50 810.00 485.00 146.50 34.00 0.00 3821.50
2007 0.00 1.00 0.00 z 137.00 470.00 646.67 c 1078.50 864.38 a 463.50 102.00 2.50 1.00 3766.55
2008 0.00 0.00 0.00 73.50 363.00 596.79 b 905.50 847.00 487.00 172.00 19.50 0.00 3464.29
2009 0.00 0.00 a 20.50 101.79 b 417.98 a 565.50 898.00 781.00 660.00 83.70 a 0.00 0.00 3528.47
2010 0.00 0.00 4.50 92.59 a 192.72 a 518.00 856.12 a 550.00 j 390.00 g 259.00 27.00 0.00 1949.92
2011 0.00 a 0.00 c 5.54 c 40.71 b 210.80 a 491.38 a 825.63 a 882.98 a 627.41 a 195.50 0.00 a 0.00 a 3279.96
2012 0.00 c 0.00 c 33.07 a 214.44 c 323.43 a 554.50 977.50 918.38 c 558.50 167.92 a 26.50 7.23 a 3781.47
2013 0.00 0.00 26.72 b 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 26.72
Period of Record Statistics
MEAN 0.93 3.67 35.54 154.40 396.73 615.09 923.32 858.75 534.12 209.22 15.95 1.42 3745.68
S.D. 3.10 6.56 30.12 69.32 88.39 97.81 79.60 72.41 86.30 65.39 18.45 3.23 249.11
SKEW 5.56 2.64 1.34 0.48 0.05 0.17 -0.62 0.00 -0.18 0.51 2.52 2.99 0.09
MAX 23.50 35.50 143.50 324.00 613.00 860.00 1090.50 1010.00 702.00 440.50 117.00 16.00 4246.50
MIN 0.00 0.00 0.00 28.50 192.72 400.86 622.50 692.50 346.50 71.50 0.00 0.00 3273.00
NO YRS 77 76 74 75 76 74 75 76 76 76 77 77 61