COULEE DAM 1 SW, WASHINGTON

Monthly Total Heating Degree Days

(451767)

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
1934 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 h 153.00 343.58 a 610.71 b 485.50 o 1107.30
1935 1125.76 d 794.50 446.50 l 0.00 z 0.00 z 7.50 j 7.20 c 7.50 22.76 a 410.50 900.52 a 1030.75 a 4299.48
1936 1048.50 1427.44 b 734.38 b 310.71 b 81.12 a 43.93 b 0.00 0.00 l 67.78 c 243.50 937.50 936.00 5830.86
1937 1636.28 a 1104.00 629.00 419.50 127.00 49.50 0.00 a 11.07 c 64.66 a 265.64 b 686.40 e 551.00 m 4993.05
1938 1023.00 a 861.26 a 679.93 a 330.00 a 146.22 a 30.00 0.53 b 0.00 d 5.69 a 297.08 a 846.21 a 1043.09 d 5263.02
1939 950.50 945.50 647.90 a 305.36 b 94.50 66.21 a 0.00 a 0.52 a 24.64 b 360.63 a 749.48 a 818.50 4963.74
1940 1060.00 855.00 536.82 a 334.50 84.50 14.50 3.00 0.00 a 30.50 269.00 898.00 974.50 5060.32
1941 996.65 a 757.50 489.50 256.50 157.50 37.50 0.00 9.00 138.50 385.95 a 673.97 a 900.50 4803.07
1942 1211.50 826.00 684.50 348.00 265.00 106.50 7.75 a 16.53 a 38.79 a 369.00 900.00 a 1103.00 5876.58
1943 1437.50 0.00 z 850.50 381.50 348.50 136.50 17.50 8.00 43.50 423.00 810.00 1130.00 5586.50
1944 1204.00 972.50 797.00 395.50 158.00 33.50 4.00 3.50 89.50 288.50 823.50 1149.50 5919.00
1945 1054.50 792.50 717.50 519.50 166.00 60.00 0.00 10.00 173.50 345.65 a 866.50 1025.58 a 5731.23
1946 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 0.00 z 0.00 z 0.00 z 0.00
1947 1230.00 862.50 647.00 428.00 91.50 78.50 6.50 15.50 115.00 454.00 826.00 1028.00 5782.50
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 10.50 34.00 24.28 a 171.50 513.50 820.00 1349.50 2923.28
1949 1690.00 1141.00 762.50 387.93 a 148.00 85.00 11.00 13.00 93.10 a 536.00 645.50 1128.50 6641.53
1950 1756.00 1036.00 835.00 457.50 f 310.00 111.50 3.50 0.00 z 4.00 543.50 846.50 987.50 6433.50
1951 1146.00 942.50 952.50 453.50 225.50 68.00 20.00 55.28 a 103.00 506.50 844.00 1295.00 6611.78
1952 1338.50 975.00 805.50 411.00 182.00 62.50 7.50 10.33 a 53.00 289.00 906.50 1052.50 6093.33
1953 896.00 809.00 721.50 516.00 294.50 181.00 2.00 29.00 107.50 362.50 723.00 964.50 5606.50
1954 1242.00 826.00 855.50 565.00 214.00 148.50 21.50 49.00 143.50 531.00 647.00 1061.00 6304.00
1955 1169.50 1053.50 983.50 638.50 377.00 61.00 44.00 2.50 168.50 486.00 1087.00 1235.00 7306.00
1956 1147.00 1240.00 874.00 391.00 180.00 119.50 4.00 18.50 102.50 503.50 950.50 1077.25 a 6607.75
1957 1612.00 1097.00 782.50 430.00 128.00 58.00 12.00 11.50 47.00 527.00 827.00 912.95 a 6444.95
1958 967.00 680.00 737.50 510.50 86.50 28.00 0.00 0.00 163.00 415.50 893.00 1030.00 5511.00
1959 1116.50 1016.00 751.50 443.50 371.50 94.50 25.50 40.00 208.50 523.00 934.50 1072.00 6597.00
1960 1323.00 930.00 788.50 498.00 351.50 62.00 0.00 64.00 92.50 403.00 808.50 1166.50 6487.50
1961 1049.00 734.50 715.00 498.00 256.50 35.00 0.50 2.00 162.50 502.00 949.00 1141.00 6045.00
1962 1269.50 880.50 838.00 388.00 337.50 98.00 28.00 17.50 91.50 457.50 719.00 935.50 6060.50
1963 1290.00 816.00 691.00 510.00 240.00 72.50 9.50 7.50 46.00 352.50 761.00 1144.00 5940.00
1964 1071.00 943.00 831.50 522.50 266.00 59.00 12.00 45.00 163.00 440.00 853.00 1260.50 6466.50
1965 1112.00 912.50 850.00 418.50 280.50 45.50 13.00 25.50 177.50 349.50 731.50 1051.00 5967.00
1966 1149.50 874.50 753.00 435.50 196.00 115.00 26.00 19.00 40.00 452.00 719.50 938.00 5718.00
1967 934.50 736.50 763.50 592.00 279.00 35.50 1.50 0.00 30.00 429.00 772.50 1103.50 5677.50
1968 1078.50 816.00 630.00 512.00 191.50 47.50 1.50 50.50 101.50 521.50 797.00 1155.50 5903.00
1969 1523.50 1049.50 786.50 441.50 129.00 31.00 5.00 8.00 128.50 523.90 a 798.00 1021.00 6445.40
1970 1200.50 838.00 776.00 584.50 227.50 39.00 2.00 3.00 254.50 503.50 878.50 1145.50 6452.50
1971 1123.00 865.00 904.50 496.00 181.50 143.50 36.00 6.00 209.50 511.00 802.50 1233.00 6511.50
1972 1288.00 979.00 695.00 576.50 207.50 73.00 25.00 14.00 234.00 472.00 772.50 1176.50 6513.00
1973 1203.50 905.00 680.00 422.00 219.50 89.00 10.00 19.00 135.00 470.00 868.50 917.50 5939.00
1974 1190.50 781.50 731.00 442.00 341.00 62.50 19.00 3.00 68.50 392.00 753.00 979.82 c 5763.82
1975 1213.50 1067.50 899.50 576.50 268.00 84.50 3.00 39.50 87.00 480.50 827.00 1056.50 6603.00
1976 1107.00 892.00 840.50 506.00 249.00 145.50 10.50 56.00 42.00 475.00 828.50 1101.00 6253.00
1977 1350.50 822.00 757.00 347.50 312.50 36.72 a 23.00 26.50 190.50 483.00 871.50 1150.00 6370.72
1978 1185.50 889.00 662.50 457.00 256.02 b 37.76 a 4.65 a 44.50 173.04 b 437.00 973.50 977.50 h 5120.46
1979 1588.50 973.50 670.50 490.50 178.00 43.00 20.00 4.00 25.50 324.39 c 941.50 936.72 a 6196.11
1980 1394.00 962.18 a 779.50 352.00 200.97 b 97.00 15.50 21.50 98.00 401.45 a 761.50 1002.69 b 6086.28
1981 932.50 808.50 620.50 476.38 a 253.50 132.50 27.50 0.50 146.50 491.00 730.50 1077.00 5696.88
1982 1220.50 870.00 724.00 585.00 231.00 53.50 27.00 3.50 123.50 457.50 937.00 1114.00 6346.50
1983 970.00 750.00 628.50 497.50 221.00 32.00 i 51.50 0.00 156.00 441.50 687.00 1401.00 5804.00
1984 1104.00 888.00 644.50 519.50 365.00 120.50 2.00 11.00 193.50 554.00 821.00 1396.00 6619.00
1985 1328.50 1106.00 859.00 408.50 159.50 34.00 0.00 2.00 227.00 483.50 1242.00 1397.00 7247.00
1986 1142.00 961.50 627.00 491.50 246.00 12.00 27.00 0.00 291.00 394.00 780.00 1085.00 6057.00
1987 1128.00 772.50 648.00 336.00 145.00 44.50 0.00 z 0.00 z 46.03 a 346.00 714.50 1084.00 5264.53
1988 1188.50 863.50 667.50 348.00 227.50 94.00 6.00 0.00 129.83 a 278.50 755.50 1103.50 5662.33
1989 1065.00 1117.50 806.50 370.50 244.00 22.50 5.50 12.50 43.50 434.50 732.50 1041.50 5896.00
1990 923.00 939.00 656.00 334.50 265.50 107.00 5.50 9.50 6.00 496.00 694.50 1304.50 5741.00
1991 1284.50 698.50 769.00 446.00 250.50 125.00 0.00 4.50 20.50 450.50 837.00 966.50 5852.50
1992 1013.00 748.00 534.50 377.50 130.00 22.00 5.00 30.00 137.50 387.50 856.50 1296.50 5538.00
1993 1414.00 1083.50 819.50 521.50 0.00 z 84.00 50.50 21.50 117.50 331.00 949.00 1033.50 6425.50
1994 947.50 923.00 614.50 329.50 180.00 81.00 3.50 0.00 26.50 431.00 920.00 1044.00 5500.50
1995 1110.50 758.00 720.50 456.50 150.50 78.50 0.00 29.00 71.00 498.50 749.50 1074.50 5697.00
1996 1259.00 1047.62 a 771.00 442.50 348.00 64.50 12.00 4.50 167.00 489.00 944.50 1275.00 6824.62
1997 1219.50 998.00 768.50 526.50 188.50 94.50 7.00 2.00 83.00 472.00 795.50 1069.50 6224.50
1998 0.00 z 750.50 675.00 433.00 173.50 0.00 z 0.00 5.00 39.50 435.00 682.00 1090.50 4284.00
1999 970.50 802.00 719.72 a 519.50 333.50 106.00 31.50 13.43 a 118.50 454.50 690.00 949.00 5708.15
2000 1133.50 957.54 b 761.50 370.00 264.00 0.00 z 26.87 a 15.00 145.34 a 470.17 a 997.24 a 1257.10 b 6398.26
2001 1193.00 1044.00 764.00 511.50 222.50 170.17 a 18.00 3.62 a 87.50 529.58 a 745.00 1047.50 6336.37
2002 1011.50 863.00 922.00 500.00 328.50 78.50 12.50 17.00 127.00 566.50 786.50 966.00 6179.00
2003 1000.00 850.50 707.50 458.00 253.00 27.00 1.50 0.00 72.00 284.50 916.50 0.00 z 4570.50
2004 0.00 z 0.00 z 0.00 z 332.88 d 211.00 66.50 4.00 9.00 114.00 393.50 754.50 984.50 2869.88
2005 1193.50 821.50 590.00 409.50 163.00 62.00 0.00 z 2.50 83.50 344.00 0.00 z 1252.50 4922.00
2006 928.00 865.50 761.50 447.00 265.50 79.00 5.00 6.50 110.00 481.00 874.50 1179.00 6002.50
2007 1237.50 874.00 676.00 495.00 209.00 0.00 z 1.00 9.50 133.00 513.50 884.50 1116.00 6149.00
2008 1313.00 953.50 801.50 624.50 196.00 114.50 1.50 15.00 104.50 458.50 800.50 1340.50 6723.50
2009 1305.50 1027.50 874.00 515.50 242.00 30.00 3.00 7.50 73.00 572.50 790.00 1270.00 6710.50
2010 972.00 756.50 681.00 465.50 365.50 123.00 22.50 25.00 111.00 396.50 913.50 1077.00 5909.00
2011 1052.50 993.50 749.50 617.50 345.50 110.00 18.00 0.50 64.66 a 470.00 869.00 1135.00 6425.66
2012 1190.50 952.50 765.50 450.00 264.00 121.50 5.50 2.00 33.62 a 438.13 a 747.00 1011.50 5981.75
2013 1244.00 894.50 707.50 10.50 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 2846.00
Period of Record Statistics
MEAN 1182.65 912.29 740.72 452.15 227.67 74.93 11.71 14.50 106.24 433.56 823.87 1099.46 6088.56
S.D. 185.89 131.69 96.57 84.22 76.83 39.79 12.53 15.58 63.07 80.31 104.99 128.67 497.73
SKEW 0.98 0.97 0.02 0.04 0.11 0.51 1.28 1.42 0.50 -0.53 0.82 0.52 -0.11
MAX 1756.00 1427.44 983.50 638.50 377.00 181.00 51.50 64.00 291.00 572.50 1242.00 1401.00 7306.00
MIN 896.00 680.00 489.50 256.50 81.12 10.50 0.00 0.00 4.00 243.50 610.71 818.50 4803.07
NO YRS 75 75 75 74 74 72 75 74 78 78 77 74 61