LEWISTON WSO AP, IDAHO

Monthly Total Heating Degree Days

(105241)

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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 13.43 a 130.50 426.50 762.00 1131.00 2463.43
1949 1572.00 880.00 650.50 330.00 158.50 59.50 2.00 0.50 95.50 564.50 594.00 942.00 5849.00
1950 1505.00 848.50 730.00 516.00 285.50 106.50 9.00 13.00 117.00 367.00 669.50 744.00 5911.00
1951 986.50 779.00 784.50 396.00 233.50 106.50 10.00 27.50 82.50 481.00 772.00 1091.50 5750.50
1952 1119.50 798.50 717.50 347.50 187.50 92.00 9.00 9.00 57.00 281.00 889.00 893.00 5400.50
1953 647.00 708.00 651.00 448.00 320.50 159.00 0.00 19.50 64.50 363.00 635.00 812.50 4828.00
1954 1006.00 667.00 775.00 470.00 210.00 158.50 8.00 41.50 138.00 500.50 637.00 992.00 5603.50
1955 1039.50 877.50 921.00 599.00 362.00 61.50 42.50 1.50 189.50 409.50 939.00 1028.50 6471.00
1956 996.50 1074.00 711.00 351.50 210.00 104.50 5.50 36.50 97.50 477.50 844.00 892.50 5801.00
1957 1447.50 827.50 658.50 435.00 153.50 60.50 1.00 1.50 51.50 449.50 787.50 788.00 5661.50
1958 858.00 568.00 738.00 483.50 105.50 35.00 2.00 0.00 134.50 368.50 718.00 805.50 4816.50
1959 910.00 795.00 660.00 428.00 332.00 65.50 18.00 24.00 200.00 445.50 868.00 936.00 5682.00
1960 1194.50 830.50 659.50 433.50 321.50 45.00 0.00 60.00 76.50 416.50 735.00 1034.50 5807.00
1961 908.00 631.00 633.00 459.50 261.50 16.50 0.00 0.00 177.50 481.50 870.50 961.50 5400.50
1962 1020.50 771.50 730.00 346.00 319.50 85.00 22.50 25.00 97.50 420.50 654.00 876.00 5368.00
1963 1266.00 681.50 616.00 477.00 183.00 72.00 2.00 2.50 46.50 283.50 664.50 963.50 5258.00
1964 875.00 816.50 720.50 521.00 253.50 78.50 4.00 34.00 137.00 394.00 781.00 1039.50 5654.50
1965 958.00 711.00 774.50 389.00 267.50 48.50 11.00 19.50 188.00 273.00 621.50 885.50 5147.00
1966 895.00 760.50 660.00 429.00 166.00 85.50 18.50 12.50 21.50 407.00 653.50 780.00 4889.00
1967 784.50 664.00 710.50 554.50 223.50 28.00 0.00 0.00 32.50 359.50 724.00 976.50 5057.50
1968 936.00 635.50 547.00 500.50 207.00 54.00 0.00 33.50 121.00 452.00 695.50 1052.00 5234.00
1969 1282.50 848.50 675.00 430.00 140.50 41.50 0.00 10.50 91.00 531.50 726.00 932.00 5709.00
1970 949.50 645.50 689.00 563.00 193.00 60.00 3.00 0.00 223.50 471.00 707.00 961.00 5465.50
1971 892.00 727.50 749.00 463.00 176.00 121.50 17.50 12.00 213.50 505.50 758.50 957.00 5593.00
1972 1016.00 796.50 558.50 538.50 174.50 47.50 14.00 1.00 182.00 427.50 712.50 1118.50 5587.00
1973 1015.50 726.00 598.00 437.50 180.00 62.50 1.00 6.00 85.00 425.00 756.00 795.50 5088.00
1974 1112.50 665.00 642.50 418.00 274.00 38.50 10.00 0.50 55.00 370.00 659.00 858.50 5103.50
1975 953.50 832.50 744.00 555.50 236.00 91.50 1.50 19.50 53.00 427.00 742.50 871.00 5527.50
1976 868.00 784.00 747.50 447.00 179.00 121.50 3.50 19.00 16.50 337.50 645.50 912.50 5081.50
1977 1123.00 658.50 709.00 304.00 273.00 11.00 17.00 19.50 156.50 443.00 767.50 876.00 5358.00
1978 919.00 679.50 538.50 450.50 279.50 43.00 7.00 24.50 143.50 398.00 897.50 1117.50 5498.00
1979 1492.50 813.50 590.00 455.50 195.50 62.50 13.00 0.00 17.00 287.50 826.50 782.50 5536.00
1980 1129.00 736.50 680.00 280.50 225.50 90.50 0.00 36.50 77.50 409.00 702.50 764.50 5132.00
1981 823.00 708.00 573.00 408.50 257.00 115.00 13.50 0.00 120.50 479.50 625.50 877.50 5001.00
1982 1025.58 a 790.50 643.50 520.00 246.50 59.50 17.00 0.00 120.00 422.50 786.00 936.00 5567.08
1983 760.50 618.00 556.50 475.00 248.00 55.50 19.00 0.00 145.50 371.50 636.50 1231.50 5117.50
1984 899.50 703.50 564.00 475.50 286.50 102.00 0.00 7.50 163.00 517.00 685.50 1072.00 5476.00
1985 1148.50 908.50 705.00 346.50 202.50 50.50 0.00 13.00 253.00 507.00 1082.00 1295.50 6512.00
1986 801.50 729.00 502.50 436.50 253.00 26.00 29.00 4.00 198.00 344.50 737.50 940.00 5001.50
1987 1022.50 688.50 577.50 261.50 143.50 33.50 10.00 3.00 38.50 332.00 643.00 968.00 4721.50
1988 982.50 687.00 640.00 348.50 220.50 91.00 13.50 0.00 127.00 212.00 674.00 956.50 4952.50
1989 891.50 1076.50 580.00 267.50 191.50 19.50 3.00 14.50 32.00 329.50 538.00 841.50 4785.00
1990 717.50 710.50 515.50 239.00 203.50 60.00 0.50 3.50 0.50 377.00 538.00 1067.50 4433.00
1991 946.00 484.50 608.00 390.00 283.50 151.50 3.00 0.00 48.00 448.50 747.00 849.50 4959.50
1992 840.00 663.50 493.00 337.00 112.50 42.50 4.00 41.00 126.00 345.50 744.50 1001.00 4750.50
1993 1179.00 901.00 576.00 446.00 128.50 85.50 39.00 27.50 110.50 332.00 895.50 897.50 5618.00
1994 762.50 823.00 570.00 337.00 154.00 73.00 9.50 0.00 41.00 400.00 798.50 943.50 4912.00
1995 928.50 646.00 636.50 454.00 184.00 100.00 0.00 17.00 75.00 485.50 597.00 940.50 5064.00
1996 957.50 890.71 a 670.00 410.00 338.00 73.00 4.50 2.50 150.50 424.00 735.50 953.50 5609.71
1997 970.50 748.00 634.50 487.50 149.50 63.50 13.00 0.00 56.00 411.00 657.00 958.50 5149.00
1998 871.00 643.50 602.50 425.00 207.50 42.00 0.00 1.00 50.00 467.50 644.00 947.00 4901.00
1999 850.50 685.00 660.50 490.50 316.50 118.00 16.50 17.00 88.00 402.50 580.86 a 857.50 5083.36
2000 898.50 706.50 645.00 319.00 217.00 a 55.00 11.50 4.00 163.50 476.50 927.50 996.50 5420.50
2001 955.50 787.00 617.00 499.00 206.50 118.00 2.50 0.00 34.00 412.50 626.00 935.00 5193.00
2002 870.50 731.00 751.50 456.50 268.00 73.50 0.00 11.50 99.00 536.50 702.50 832.50 5333.00
2003 781.50 757.00 584.50 454.50 266.50 28.50 0.00 0.00 67.50 310.50 789.50 880.50 4920.50
2004 961.00 717.50 492.00 329.50 202.00 62.50 0.50 3.00 78.50 362.00 693.00 841.50 4743.00
2005 839.00 724.00 531.50 378.50 162.00 85.50 0.00 0.00 103.00 346.00 740.50 1028.00 4938.00
2006 707.00 770.50 630.00 391.50 183.50 16.50 0.00 11.00 92.00 444.00 665.50 912.00 4823.50
2007 1051.50 709.50 509.00 402.50 165.00 52.50 0.00 7.50 99.50 396.00 755.00 896.00 5044.00
2008 993.00 688.50 708.00 537.50 174.50 90.50 0.00 6.50 53.00 393.50 618.50 1073.00 5336.50
2009 964.00 711.50 755.00 439.50 201.00 35.50 2.00 3.50 50.00 510.50 708.00 1108.00 5488.50
2010 744.50 627.50 592.50 420.00 330.00 95.50 8.50 20.50 60.00 363.00 794.50 912.50 4969.00
2011 874.00 837.50 623.50 579.00 311.50 102.00 1.50 1.00 24.50 372.00 738.00 983.50 5448.00
2012 887.50 746.00 645.50 370.00 242.50 77.00 1.00 0.00 13.00 375.00 579.00 833.00 4769.50
2013 977.50 660.33 d 542.00 9.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 35.00 z 2179.83
Period of Record Statistics
MEAN 977.86 746.43 644.68 427.97 224.13 71.37 7.42 11.45 99.24 408.63 724.60 943.67 5286.10
S.D. 186.63 102.25 84.25 80.37 60.78 34.22 9.24 13.34 58.55 70.94 102.27 109.83 404.54
SKEW 1.29 0.80 0.39 -0.20 0.30 0.54 1.77 1.35 0.52 -0.19 0.82 0.71 0.64
MAX 1572.00 1076.50 921.00 599.00 362.00 159.00 42.50 60.00 253.00 564.50 1082.00 1295.50 6512.00
MIN 647.00 484.50 492.00 239.00 105.50 11.00 0.00 0.00 0.50 212.00 538.00 744.00 4433.00
NO YRS 65 65 65 64 64 64 64 65 65 65 65 65 64