SWAN FALLS POWER HOUSE, IDAHO

Monthly Total Heating Degree Days

(108928)

Base Temperature = 65 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 0.00 a 0.00 c 20.00 318.00 897.50 1117.00 2352.50
1936 957.00 440.00 n 688.56 e 324.50 67.17 a 17.50 0.00 c 0.00 b 77.68 b 232.50 a 778.45 a 916.50 4059.85
1937 1521.58 a 906.89 a 578.15 a 459.00 78.50 20.50 0.00 0.00 52.00 246.50 540.50 804.97 a 5208.59
1938 858.04 c 624.96 c 678.38 a 352.50 225.04 d 39.11 b 3.21 b 0.00 a 11.90 a 289.33 a 828.00 919.00 4829.46
1939 915.50 865.00 577.00 261.50 76.50 60.50 0.00 0.00 44.00 300.50 648.00 790.50 4539.00
1940 947.50 687.50 515.50 347.00 64.50 14.00 0.00 a 0.00 85.50 256.00 792.00 875.50 4585.00
1941 923.00 660.07 a 515.12 a 365.00 141.50 51.50 0.00 a 2.00 117.00 331.50 637.50 b 827.50 4571.69
1942 1270.50 854.00 707.83 a 297.00 274.50 64.50 0.00 a 18.50 44.50 261.50 675.00 895.50 5363.33
1943 985.00 749.50 700.00 231.00 214.86 b 89.50 4.65 a 9.50 11.50 300.00 695.00 963.50 4954.01
1944 1169.50 805.00 720.00 407.50 127.50 97.76 a 0.00 0.00 77.50 167.00 734.00 1053.48 a 5359.24
1945 941.48 d 719.19 a 695.95 a 480.00 167.00 71.90 a 0.00 a 4.65 a 138.00 223.00 649.00 955.50 5045.66
1946 944.50 784.00 557.50 259.44 c 86.91 c 12.50 0.00 0.00 103.50 497.50 734.00 793.50 4773.35
1947 1187.82 a 682.00 511.50 334.50 58.50 56.00 0.00 0.00 78.00 251.10 a 715.50 919.50 4794.42
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 5.00 95.00 278.00 726.50 1109.59 b 2214.09
1949 1566.50 867.50 576.82 c 219.83 a 90.86 b 51.00 0.00 0.00 29.50 449.00 533.00 918.50 5302.51
1950 1127.50 733.50 653.00 364.00 187.03 a 51.50 1.50 2.50 70.50 171.50 591.00 817.50 4771.03
1951 989.50 709.33 a 710.50 282.00 133.00 49.50 0.00 9.50 21.50 347.50 692.00 1009.50 4953.83
1952 1150.50 920.00 757.00 246.00 96.50 19.00 0.00 0.00 16.50 151.50 794.00 878.00 5029.00
1953 629.50 651.00 525.00 397.00 225.00 60.00 0.00 0.00 a 12.00 218.00 474.31 a 946.00 4137.81
1954 779.00 609.00 647.00 261.00 87.00 102.00 0.00 a 9.00 49.29 b 306.50 551.79 b 976.50 4378.07
1955 1136.00 902.00 730.00 458.57 b 160.88 b 17.59 a 6.00 0.00 d 79.29 b 238.38 b 758.50 808.00 5295.20
1956 888.00 982.00 434.00 g 279.00 122.40 b 27.00 0.00 4.00 33.50 337.00 770.50 981.48 c 4424.88
1957 1205.50 735.00 540.90 b 362.07 a 118.50 25.86 a 0.00 0.00 19.00 352.00 735.00 837.00 4930.83
1958 923.00 552.50 623.50 387.50 53.00 7.00 0.00 0.00 41.50 192.00 658.00 805.00 4243.00
1959 802.50 688.00 588.00 241.50 223.50 3.00 0.00 2.50 128.50 277.50 698.50 989.00 4642.50
1960 1157.50 829.00 539.00 294.00 169.50 2.50 0.00 12.00 10.50 313.00 638.50 988.00 4953.50
1961 945.00 588.50 536.50 337.50 116.00 0.00 0.00 0.00 118.50 335.83 a 710.00 967.00 4654.83
1962 1254.00 847.50 679.00 213.00 137.50 34.50 0.00 2.50 23.50 274.00 584.50 843.50 4893.50
1963 1159.50 533.00 537.50 409.50 95.50 54.50 0.00 0.00 7.00 183.50 612.50 1051.50 4644.00
1964 1052.00 899.00 721.00 391.03 a 160.50 52.50 0.00 12.50 45.00 221.00 684.00 832.00 5070.53
1965 905.00 655.50 653.00 279.50 181.50 31.00 0.00 8.00 119.50 188.50 527.50 954.50 4503.50
1966 855.00 756.00 538.50 293.00 74.00 39.00 0.00 3.00 10.50 314.00 559.50 918.50 4361.00
1967 777.50 619.00 560.50 488.50 161.50 24.50 0.00 0.00 16.03 a 286.00 606.00 1023.00 4562.53
1968 990.50 595.50 452.50 386.00 119.50 13.00 0.00 34.00 59.50 287.00 662.50 892.50 4492.50
1969 914.50 780.50 623.50 269.00 62.00 40.00 0.00 0.00 16.50 435.50 662.00 873.00 4676.50
1970 818.00 596.50 608.00 490.00 137.00 35.00 0.00 g 0.00 139.50 417.00 594.00 915.50 4750.50
1971 874.50 656.50 655.00 358.50 93.50 42.00 0.00 0.00 128.00 370.00 692.00 982.00 4852.00
1972 989.00 763.00 495.00 386.50 96.00 13.00 2.50 0.00 138.00 302.50 687.00 1195.00 5067.50
1973 1006.00 681.50 573.00 346.55 a 87.00 32.50 0.00 0.00 63.00 276.50 633.50 799.50 4499.05
1974 1014.00 695.33 a 600.50 343.50 167.00 10.86 a 4.50 2.00 11.54 d 276.50 480.50 f 907.00 4032.73
1975 1050.50 717.50 614.00 517.00 171.50 26.00 0.00 4.50 14.50 295.50 682.00 916.00 5009.00
1976 928.50 780.50 721.00 362.00 43.00 32.00 0.00 7.00 31.00 306.00 623.50 1009.50 4844.00
1977 1268.50 751.50 620.00 199.50 210.50 0.00 0.00 18.50 67.00 287.00 675.00 817.88 a 4915.38
1978 793.00 670.50 410.50 359.42 d 179.00 12.50 0.00 6.00 86.50 232.50 762.00 1078.00 4589.92
1979 1361.50 782.50 522.50 352.00 113.50 19.50 0.00 0.00 1.50 231.00 799.00 542.50 j 4183.00
1980 992.00 676.00 579.00 227.50 157.50 73.00 0.00 3.00 40.50 301.00 695.50 945.50 4690.50
1981 917.00 700.50 522.00 311.50 179.50 40.50 0.50 0.00 62.00 382.50 545.00 831.50 4492.50
1982 1097.50 855.00 605.00 448.00 138.00 32.50 2.00 0.00 0.00 z 326.00 783.00 936.00 5223.00
1983 890.00 600.00 517.00 439.00 199.00 14.50 8.00 0.00 54.00 271.00 578.50 1118.50 4689.50
1984 1170.50 905.50 576.00 402.00 188.00 99.50 0.00 0.00 120.00 434.50 670.00 1180.21 c 5746.21
1985 1241.00 959.50 728.00 207.00 70.50 6.00 i 0.00 0.00 137.50 367.50 969.00 1472.50 6152.50
1986 958.50 575.00 384.50 346.50 180.50 0.00 7.50 0.00 150.50 273.00 613.89 c 1038.50 4528.39
1987 1059.50 695.00 517.50 0.00 z 63.00 12.00 1.50 3.00 33.50 214.50 651.50 957.50 4208.50
1988 1095.50 719.50 512.50 225.00 164.00 12.00 0.00 0.00 68.00 85.00 621.50 1046.00 4549.00
1989 1101.00 1024.50 528.50 220.50 131.50 3.00 0.00 8.50 22.00 313.00 680.00 982.50 5015.00
1990 865.50 750.00 481.50 163.00 161.50 45.00 0.00 0.00 0.50 309.50 655.00 1362.00 4793.50
1991 1187.00 583.00 528.00 367.50 174.00 21.50 0.00 0.00 22.50 306.00 783.50 964.50 4937.50
1992 917.50 604.00 413.50 204.50 43.92 a 27.00 2.50 10.50 34.00 224.00 782.00 1042.50 4305.92
1993 1144.00 891.50 618.50 365.00 93.50 75.50 4.00 10.50 41.00 278.00 877.00 911.00 5309.50
1994 926.50 780.50 423.50 283.00 75.50 28.00 2.00 0.00 6.50 315.50 839.50 1032.50 4713.00
1995 850.00 577.50 550.50 356.00 143.00 72.50 0.50 3.50 36.50 232.50 l 542.00 942.50 4074.50
1996 917.00 803.50 554.00 370.50 195.50 13.50 0.00 4.50 115.00 346.50 632.50 848.50 4801.00
1997 927.00 710.00 0.00 z 400.50 98.00 9.50 1.50 0.00 24.83 a 348.50 637.00 996.50 4153.33
1998 755.50 658.00 562.50 389.00 189.50 0.00 z 0.00 z 0.00 28.50 318.00 588.50 990.50 4480.00
1999 868.50 726.00 614.00 426.00 248.53 b 47.00 0.00 a 0.00 54.50 277.40 b 505.00 975.00 4741.93
2000 901.50 633.00 570.00 211.00 113.00 13.50 0.00 b 0.00 a 81.67 c 0.00 z 349.50 965.81 b 3838.98
2001 1040.00 782.00 474.50 419.50 89.90 a 26.54 d 2.77 c 0.00 6.67 c 303.59 b 568.50 954.50 4668.46
2002 919.00 787.50 660.00 300.50 146.00 30.52 a 0.00 0.00 f 52.50 386.98 a 673.50 812.50 4769.00
2003 802.50 710.50 479.00 365.50 168.50 9.00 0.00 0.00 55.00 193.00 753.00 793.00 4329.00
2004 1009.00 801.00 404.00 253.50 138.00 12.00 0.00 1.55 a 72.50 298.50 759.83 a 866.50 4616.38
2005 958.00 708.50 492.00 359.00 128.00 64.00 0.00 0.00 c 95.50 297.00 755.00 1042.50 4899.50
2006 809.00 780.50 624.00 313.50 140.00 2.50 0.00 2.50 82.00 348.00 629.50 951.00 4682.50
2007 1023.50 647.00 0.00 z 355.50 86.50 36.67 c 0.00 0.00 a 93.50 396.00 699.00 986.00 4323.67
2008 1042.00 764.50 685.00 500.50 163.50 60.54 b 0.00 4.00 37.50 347.00 598.00 996.50 5199.04
2009 1016.00 786.07 a 652.00 400.71 b 155.00 a 15.50 0.00 14.50 20.50 460.35 a 682.50 1147.00 5350.14
2010 849.50 662.50 601.50 449.48 a 310.00 a 42.50 1.03 a 1.50 j 30.50 g 253.00 713.50 902.00 4785.02
2011 992.52 a 817.04 c 614.46 c 480.54 b 265.05 a 64.14 a 0.00 a 0.00 a 8.79 a 323.00 712.24 a 1006.98 a 5284.76
2012 901.77 c 716.08 c 558.00 a 285.00 c 189.10 a 57.00 0.00 0.00 c 11.00 346.68 a 624.00 883.50 a 4572.13
2013 1368.50 750.50 615.72 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 2734.72
Period of Record Statistics
MEAN 1005.80 737.21 582.49 340.53 140.03 34.93 0.75 3.20 55.70 295.67 673.64 957.84 4806.76
S.D. 171.27 107.13 86.91 83.97 57.31 25.46 1.72 5.74 41.51 73.89 100.56 121.38 322.27
SKEW 0.92 0.41 -0.09 0.01 0.49 0.75 2.66 2.82 0.64 0.11 0.00 1.49 0.44
MAX 1566.50 1024.50 757.00 517.00 310.00 102.00 8.00 34.00 150.50 497.50 969.00 1472.50 5746.21
MIN 629.50 533.00 384.50 163.00 43.00 0.00 0.00 0.00 0.50 85.00 349.50 790.50 4137.81
NO YRS 77 76 74 75 76 74 75 76 76 76 77 77 61