TUTKA BAY LAGOON, ALASKA

Monthly Total Heating Degree Days

(509460)

Base Temperature = 65 F

File last updated on Jul 24, 2006
*** Note *** Provisional Data *** After Year/Month 200312
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
1979 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 168.50 o 166.50 u 632.50 f 695.00 g 1443.22 d 1443.22
1980 0.00 z 0.00 z 659.00 l 842.14 b 350.50 p 94.50 x 214.50 i 415.73 c 571.03 a 848.76 b 983.04 b 1207.50 g 3660.70
1981 706.50 h 519.00 m 928.00 0.00 z 582.50 422.50 286.00 365.50 577.50 852.00 0.00 z 1169.73 a 5183.73
1982 1390.35 a 0.00 z 1111.50 983.00 777.50 485.50 356.50 361.00 506.50 0.00 z 1024.00 1067.95 a 8063.80
1983 1307.50 1036.00 1004.50 907.76 a 662.37 a 484.00 342.50 290.50 572.50 879.00 982.00 1148.50 9617.12
1984 1217.00 1185.50 942.00 892.50 616.90 a 309.50 256.00 190.50 515.50 819.29 c 1011.92 d 1045.00 9001.61
1985 937.50 1175.50 1067.00 0.00 z 772.42 a 525.50 307.00 364.50 523.00 985.50 1174.50 959.00 8791.42
1986 1063.50 1134.00 1182.65 a 1005.50 719.00 458.50 313.50 443.00 522.50 812.50 1002.12 d 1035.50 9692.27
1987 1104.12 a 953.50 1080.00 879.50 656.17 a 0.00 z 204.50 h 0.00 z 578.04 b 810.81 b 1031.50 1266.57 c 8360.20
1988 1167.00 990.64 d 987.87 a 905.69 a 678.12 c 410.40 e 203.00 h 241.50 i 586.61 b 867.40 e 1128.33 c 1225.03 b 8947.10
1989 1585.43 c 798.00 h 1167.67 a 661.00 g 505.00 g 428.33 c 272.00 191.50 f 429.50 842.88 b 1159.14 a 1113.79 c 6998.73
1990 1271.00 b 1344.50 0.00 z 790.50 580.50 312.93 a 310.55 c 279.00 a 515.89 b 917.60 a 1290.00 b 1229.31 b 8841.79
1991 1284.43 a 1148.50 1110.32 a 846.21 a 674.00 0.00 z 0.00 z 390.37 d 471.50 826.00 977.00 1183.00 8911.33
1992 1149.00 1211.50 1127.00 883.50 686.50 375.50 276.50 339.50 641.50 914.00 0.00 z 1239.48 a 8843.98
1993 1253.50 1074.00 1005.50 773.50 531.50 374.00 231.50 251.00 502.50 787.00 994.00 1049.50 8827.50
1994 1101.00 1139.50 1126.00 788.50 647.50 363.50 278.50 222.00 529.00 879.50 1148.28 a 1263.50 9486.78
1995 1228.00 1093.50 1280.50 801.50 625.00 361.50 267.00 0.00 z 413.50 813.00 1145.50 1122.00 9151.00
1996 1441.50 1172.50 963.00 860.50 566.00 430.50 287.50 342.50 615.00 1074.50 1125.00 1404.50 10283.00
1997 1333.00 876.00 1137.00 839.50 562.50 357.50 239.50 270.50 495.50 951.50 972.93 a 1343.00 9378.43
1998 1315.43 a 927.04 e 335.00 t 842.50 707.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 3792.48
1999 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 466.50 275.00 348.50 544.50 952.00 1128.00 1278.50 4993.00
2000 1409.00 1012.00 1036.00 885.50 682.00 417.50 286.50 330.00 545.00 866.50 0.00 z 1011.00 8481.00
2001 1055.00 994.00 1052.50 847.24 a 705.50 335.50 310.50 302.00 514.00 968.00 1176.21 a 1453.00 9713.45
2002 1145.50 1059.00 1174.50 958.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4337.50
2003 0.00 z 0.00 z 0.00 z 0.00 z 656.88 b 437.59 a 169.00 f 235.50 i 0.00 z 0.00 z 1052.68 b 897.50 i 2147.14
Period of Record Statistics
MEAN 1237.94 1084.84 1078.08 870.19 654.52 408.25 288.03 323.89 531.93 883.39 1079.27 1192.91 9500.02
S.D. 154.05 116.42 92.86 63.81 67.20 60.81 32.93 67.54 55.51 73.24 91.16 142.20 451.20
SKEW 0.23 0.20 0.18 0.52 -0.01 0.07 0.33 -0.24 -0.21 0.93 0.52 0.28 0.11
MAX 1585.43 1344.50 1280.50 1005.50 777.50 525.50 356.50 443.00 641.50 1074.50 1290.00 1453.00 10283.00
MIN 937.50 876.00 928.00 773.50 531.50 309.50 231.50 190.50 413.50 787.00 972.93 959.00 8827.50
NO YRS 20 18 19 19 20 19 17 17 21 20 19 21 8