ATTU N A U, ALASKA

Monthly Total Heating Degree Days

(500452)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 199308
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 513.00 745.00 0.00 z 0.00 z 1258.00
1950 0.00 z 0.00 z 1051.00 931.50 831.50 606.00 467.00 412.50 528.00 718.00 822.50 943.00 7311.00
1951 1050.00 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 1050.00
1952 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
1953 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
1954 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 450.03 b 507.00 791.50 900.50 986.50 3635.53
1955 1159.00 907.00 1048.00 944.00 898.00 683.50 576.00 402.50 520.50 0.00 z 839.00 954.50 8932.00
1956 936.50 916.50 1061.00 928.00 809.00 665.00 568.00 370.00 487.00 650.00 882.00 1011.50 9284.50
1957 1011.00 958.00 1042.50 915.00 824.60 a 661.00 494.00 434.00 529.00 682.50 905.50 1025.50 9482.60
1958 1127.00 969.50 1046.00 944.50 872.00 500.00 g 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4959.00
1959 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
1960 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
1961 671.50 m 944.50 1038.50 885.00 779.00 618.50 556.50 432.50 464.00 690.50 939.50 1002.00 8350.50
1962 994.50 942.00 989.00 803.00 740.00 574.00 476.00 467.00 510.00 730.50 953.00 982.00 9161.00
1963 958.00 901.00 992.00 827.50 740.00 625.50 506.00 465.50 500.00 682.50 798.50 1020.00 9016.50
1964 1120.50 1108.50 1033.00 926.00 778.50 570.50 578.50 524.00 650.00 831.50 899.50 936.00 9956.50
1965 1062.00 903.50 995.50 824.00 756.00 635.50 516.00 440.50 531.50 749.50 890.50 1000.50 9305.00
1966 1066.50 1030.00 1051.00 942.50 816.50 678.00 546.50 433.50 468.00 723.50 805.00 998.00 9559.00
1967 1093.50 1006.00 1009.00 913.50 752.00 601.00 520.50 417.50 511.50 705.00 889.50 999.50 9418.50
1968 977.00 1019.00 995.00 924.50 802.50 658.00 508.00 483.00 497.00 743.50 946.00 950.50 9504.00
1969 927.50 982.00 1045.00 927.00 815.50 640.00 490.50 383.00 413.00 743.50 925.00 1142.00 9434.00
1970 1066.50 1034.00 1036.00 964.50 837.50 667.50 545.50 454.00 479.50 703.00 817.50 1027.00 9632.50
1971 1063.50 981.00 1038.50 965.00 859.00 0.00 z 566.00 507.50 368.50 j 790.50 107.00 z 1096.50 7867.50
1972 1106.50 934.50 1010.50 866.50 785.50 630.00 0.00 z 476.50 525.00 754.00 1025.00 1030.00 9144.00
1973 1138.00 1022.00 1011.50 962.00 836.00 652.00 566.50 495.50 563.50 703.00 800.00 1040.50 9790.50
1974 990.50 943.50 1010.50 954.00 0.00 z 641.00 522.50 466.00 480.50 0.00 z 497.00 o 236.50 y 6008.50
1975 432.50 s 1062.50 0.00 z 0.00 z 683.00 i 383.00 m 307.50 k 479.43 b 468.50 492.50 971.50 1028.68 a 4503.11
1976 710.50 i 1069.38 a 1091.50 0.00 z 876.02 b 702.50 261.00 q 536.50 574.50 814.50 0.00 z 1081.50 6746.39
1977 0.00 z 0.00 z 0.00 z 0.00 z 841.00 610.00 526.50 349.00 0.00 z 762.50 1032.50 1037.98 a 5159.48
1978 1041.00 995.50 994.00 904.00 762.50 606.00 446.50 410.00 523.00 727.00 0.00 z 0.00 z 7409.50
1979 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 529.50 265.00 j 141.50 t 478.85 d 684.67 b 887.50 982.70 a 3563.22
1980 976.50 c 973.00 919.00 901.50 756.00 565.00 410.75 a 332.50 0.00 z 732.93 c 887.59 a 0.00 z 7454.76
1981 1094.50 0.00 z 0.00 z 0.00 z 761.64 b 520.86 a 351.50 385.50 460.00 554.00 784.00 929.50 5841.50
1982 945.50 790.00 0.00 z 771.00 756.50 616.50 478.00 413.50 292.50 f 646.35 a 857.00 1226.10 b 7500.45
1983 0.00 z 357.00 q 0.00 z 553.00 m 857.15 a 714.00 590.00 486.00 576.00 735.50 985.00 1074.84 b 6018.49
1984 1157.50 1059.00 783.00 h 477.50 o 316.50 s 0.00 z 0.00 z 0.00 z 0.00 z 718.50 924.64 b 0.00 z 3859.64
1985 812.00 h 951.39 e 1203.83 d 912.86 b 817.50 679.50 551.50 497.00 589.14 a 706.50 831.50 1056.50 8797.22
1986 1180.50 1007.00 1044.00 892.00 807.00 677.00 0.00 z 340.50 l 545.69 a 738.50 921.21 a 1143.50 8956.40
1987 1289.71 b 1074.08 c 0.00 z 403.00 q 818.83 b 559.29 b 558.53 b 569.76 b 528.00 0.00 z 0.00 z 0.00 z 5398.19
1988 680.00 n 1117.50 1137.00 1010.00 881.00 683.00 540.50 436.50 394.50 f 425.00 m 833.00 1062.00 7700.50
1989 1149.00 947.50 1004.29 b 805.96 d 520.50 h 392.50 i 293.50 f 265.29 e 314.46 b 538.00 698.50 1002.00 6725.01
1990 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
1991 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
1992 0.00 z 1016.50 1155.00 955.50 0.00 z 840.00 0.00 z 696.50 786.50 0.00 z 916.50 0.00 z 6366.50
1993 1325.50 688.00 h 1034.50 0.00 z 803.50 547.50 0.00 z 480.50 0.00 z 0.00 z 0.00 z 0.00 z 4191.50
Period of Record Statistics
MEAN 1074.36 985.53 1038.81 907.44 809.06 634.12 517.61 450.09 517.42 709.32 885.63 1026.58 9462.05
S.D. 100.08 70.04 55.60 57.60 44.71 63.53 55.74 75.68 77.60 73.73 74.18 66.64 259.52
SKEW 0.64 -0.34 1.06 -0.80 0.15 0.74 -1.20 0.58 0.93 -1.26 -0.17 1.03 0.23
MAX 1325.50 1117.50 1203.83 1010.00 898.00 840.00 590.00 696.50 786.50 831.50 1032.50 1226.10 9956.50
MIN 927.50 790.00 919.00 771.00 740.00 520.86 351.50 265.29 314.46 492.50 698.50 929.50 9016.50
NO YRS 27 30 28 27 30 31 26 33 30 31 30 29 12