CHIEF JOSEPH DAM, WASHINGTON

Monthly Total Heating Degree Days

(451400)

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
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 484.00 635.00 1119.00 2238.00
1950 1714.09 b 982.00 753.50 481.00 203.50 16.00 k 1.00 k 0.00 i 40.00 i 462.79 c 631.00 g 620.00 k 4596.87
1951 803.50 i 972.00 953.50 430.50 192.00 61.00 9.50 25.50 83.50 469.50 917.50 1343.50 5458.00
1952 1448.50 1067.00 883.50 429.00 196.50 84.00 18.50 26.00 72.00 343.50 913.39 b 1035.50 6517.39
1953 933.10 a 789.92 b 667.61 c 463.00 197.50 f 112.22 c 3.50 18.50 97.24 a 379.75 a 741.50 954.50 5160.84
1954 1259.63 a 806.81 a 807.07 b 482.14 b 163.30 c 107.00 24.59 b 0.00 z 127.00 545.50 668.00 1104.50 6095.55
1955 1175.00 1052.50 942.50 575.50 368.38 a 50.69 a 32.50 2.14 b 143.50 454.50 1055.00 1305.10 a 7157.31
1956 1177.00 1336.00 896.00 363.00 155.00 0.00 z 3.00 26.00 122.00 496.50 938.79 a 1070.50 6583.79
1957 1580.50 1059.50 744.00 395.00 93.00 43.00 8.00 2.50 36.00 464.00 785.00 937.00 6147.50
1958 1002.50 717.00 690.00 446.50 70.50 17.00 6.50 2.50 137.50 416.50 913.50 1024.00 5444.00
1959 1138.00 1021.50 690.50 412.00 262.50 49.50 11.50 12.00 158.00 489.00 932.50 1027.50 6204.50
1960 1320.50 935.00 741.50 442.00 259.00 33.50 0.00 40.00 77.50 361.00 827.00 1180.50 6217.50
1961 1067.00 756.50 688.50 412.00 216.00 24.50 2.50 0.00 146.50 484.50 972.50 1159.00 5929.50
1962 1281.50 885.50 805.00 342.00 257.50 59.00 17.00 7.50 70.00 409.00 689.00 956.50 5779.50
1963 1255.00 774.00 628.00 472.00 205.50 49.00 6.00 4.00 48.00 330.50 749.50 1144.00 5665.50
1964 1116.50 1038.50 0.00 z 434.00 229.00 49.50 1.50 26.00 150.50 456.00 783.50 1219.00 5504.00
1965 1120.00 903.00 805.00 366.50 219.00 37.00 6.50 20.50 148.50 374.00 727.50 1066.00 5793.50
1966 1246.00 895.00 719.00 382.00 187.50 96.00 16.50 7.00 35.50 438.50 708.00 937.50 5668.50
1967 949.00 682.50 698.00 514.00 211.00 30.00 0.50 0.00 24.00 420.00 750.00 1165.00 5444.00
1968 1168.00 815.50 637.00 495.50 203.00 54.83 a 0.50 41.50 120.50 539.00 755.50 1170.00 6000.83
1969 1567.00 1115.50 847.50 408.00 121.00 24.50 3.50 8.00 114.50 520.00 808.00 1025.50 6563.00
1970 1260.00 863.50 720.00 512.50 170.50 18.00 3.50 2.50 196.50 510.50 882.50 1274.50 6414.50
1971 1212.50 901.50 883.50 467.50 158.50 96.50 18.50 3.50 200.00 521.00 804.00 1340.50 6607.50
1972 1331.50 977.50 685.50 557.00 207.50 64.00 0.00 z 12.00 218.50 490.00 717.50 1177.50 6438.50
1973 1239.50 918.00 608.50 350.50 183.50 0.00 z 4.50 13.50 107.50 460.50 908.00 0.00 z 4794.00
1974 1214.00 794.50 727.50 415.50 292.00 43.50 g 13.00 0.00 a 79.00 457.50 764.00 988.50 5745.50
1975 1272.00 1148.00 871.00 537.00 248.50 62.00 0.00 22.00 76.00 472.00 794.50 1070.50 6573.50
1976 1125.50 859.64 a 813.00 460.00 235.00 112.50 4.00 22.50 43.50 457.00 809.00 1086.50 6028.14
1977 1303.00 0.00 z 655.50 312.50 272.50 28.00 10.00 4.00 170.00 462.00 847.50 1104.50 5169.50
1978 1161.50 876.50 638.50 431.00 235.00 39.00 0.00 15.50 134.50 460.00 939.00 e 1329.56 d 6260.06
1979 1571.00 1045.00 640.00 444.50 144.50 35.17 a 20.00 0.50 28.00 320.50 909.00 961.00 6119.17
1980 1411.50 983.00 766.50 349.00 147.50 93.50 20.00 28.00 108.00 429.00 748.89 c 1073.50 6158.39
1981 902.50 808.50 571.50 433.50 204.50 119.50 31.00 0.50 138.00 482.00 710.00 1097.50 5499.00
1982 1241.00 934.50 712.50 534.00 227.50 38.00 32.00 4.50 124.50 472.50 939.00 1134.00 6394.00
1983 995.00 791.00 586.50 435.50 193.50 55.50 30.50 1.50 180.50 495.50 709.00 1383.50 5857.50
1984 1105.50 876.50 601.50 463.00 307.50 105.00 6.00 10.00 205.00 554.00 840.00 1464.50 6538.50
1985 1299.00 1195.50 856.50 350.00 138.00 30.00 0.00 1.50 184.00 461.00 1250.00 1311.50 7077.00
1986 1165.50 960.00 596.50 431.00 212.50 8.00 12.50 0.00 192.50 370.50 747.00 1057.50 5753.50
1987 1144.50 793.50 596.50 266.00 123.00 19.00 4.00 0.00 39.00 372.50 698.00 1087.50 5143.50
1988 1220.00 859.50 612.50 309.00 187.00 72.00 3.00 0.00 88.00 297.00 741.50 1106.50 5496.00
1989 1070.00 1131.00 781.00 331.00 170.50 9.50 8.00 9.50 41.50 433.50 711.00 990.00 5686.50
1990 892.50 958.00 613.50 276.50 213.00 89.00 6.00 3.50 6.00 475.50 632.50 1257.50 5423.50
1991 1281.50 680.00 0.00 z 386.50 178.00 77.00 0.00 0.50 25.50 491.50 821.50 949.00 4891.00
1992 1006.00 728.00 477.50 341.50 104.50 17.50 0.00 23.00 104.50 418.50 824.00 1337.00 5382.00
1993 1355.50 1023.50 810.50 491.50 104.50 49.00 14.00 9.00 149.00 368.50 1011.50 1051.50 6438.00
1994 992.50 905.50 618.00 400.00 180.50 76.00 1.50 0.00 26.50 468.00 944.50 1188.00 5801.00
1995 1117.50 774.50 672.50 398.50 109.50 48.00 0.00 19.50 59.50 468.50 750.00 1033.50 5451.50
1996 1258.50 1025.50 724.00 399.50 283.50 50.50 11.00 2.50 121.50 476.00 907.00 1302.00 6561.50
1997 1230.00 975.50 734.00 437.00 162.00 20.00 0.00 0.50 17.00 372.00 a 739.00 1025.00 5712.00
1998 1115.50 730.00 608.50 373.00 143.50 10.50 0.00 1.50 30.50 447.50 658.50 1134.00 5253.00
1999 1001.50 822.50 678.00 444.50 309.00 82.00 22.50 10.00 111.50 470.50 682.50 935.50 5570.00
2000 1131.50 940.00 662.00 333.00 214.50 43.50 14.50 10.00 138.50 482.00 966.50 1225.02 a 6161.02
2001 1107.00 959.00 684.00 423.50 162.50 70.50 7.00 1.50 46.50 491.50 732.50 1022.00 5707.50
2002 1013.00 854.50 818.00 412.00 223.00 40.50 7.00 6.50 106.00 535.50 802.00 933.00 5751.00
2003 998.00 847.50 622.50 431.50 231.00 15.00 0.00 0.00 73.00 333.00 977.50 1154.50 5683.50
2004 1130.00 908.00 554.50 319.00 160.50 50.50 0.00 0.50 92.50 396.50 802.00 1005.00 5419.00
2005 1189.00 817.50 575.00 369.50 139.00 56.00 0.00 0.00 90.00 386.00 877.00 1237.50 5736.50
2006 962.50 868.50 710.50 403.00 195.50 20.50 0.50 6.50 95.00 436.00 880.00 1188.50 5767.00
2007 1251.00 826.00 622.00 431.50 141.00 59.50 0.00 6.00 118.00 502.00 865.50 1161.00 5983.50
2008 0.00 z 930.50 715.50 543.50 152.00 84.50 0.50 13.50 103.50 454.50 773.50 1323.00 5094.50
2009 1271.00 1023.00 825.00 471.00 194.50 15.50 0.00 10.50 63.00 571.00 765.00 1300.50 6510.00
2010 985.50 749.00 625.00 437.00 325.00 127.00 11.00 23.00 107.50 392.00 1004.00 1156.00 5942.00
2011 1183.50 1019.50 746.50 580.50 353.00 140.00 81.50 0.00 53.28 a 453.00 882.00 1119.50 6612.28
2012 1208.00 929.50 738.50 423.50 263.50 131.50 8.50 0.53 b 49.00 420.00 729.31 a 1001.30 a 5903.14
2013 1236.50 877.50 692.50 7.00 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 2806.50
Period of Record Statistics
MEAN 1188.41 912.63 710.49 423.22 200.24 56.97 9.48 9.34 100.87 447.28 821.71 1129.40 5978.59
S.D. 167.31 129.00 102.16 69.54 62.41 34.18 13.04 10.44 53.43 59.86 115.90 130.75 463.01
SKEW 0.74 0.61 0.39 0.09 0.48 0.62 3.10 1.23 0.25 -0.44 0.90 0.44 0.49
MAX 1714.09 1336.00 953.50 580.50 368.38 140.00 81.50 41.50 218.50 571.00 1250.00 1464.50 7157.31
MIN 892.50 680.00 477.50 266.00 70.50 8.00 0.00 0.00 6.00 297.00 632.50 933.00 5143.50
NO YRS 62 63 62 63 62 59 61 61 62 64 63 62 51