date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Oct 29, 2012
*** Note *** Provisional Data *** After Year/Month 201210
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
1955 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 57.00 f 204.50 555.93 a 562.00 i 1184.64 c 1945.08
1956 1248.35 e 889.14 d 536.00 j 531.00 f 218.00 m 143.00 100.00 67.50 258.10 a 478.50 827.00 733.27 e 4744.86
1957 1088.88 c 781.76 c 714.00 f 412.00 f 293.97 b 123.62 a 73.62 c 113.84 b 185.17 a 694.50 574.50 f 1008.65 d 4364.01
1958 916.00 j 432.00 r 513.00 p 484.00 g 267.67 e 151.03 a 53.50 90.42 a 239.00 508.83 b 367.50 l 786.00 i 1310.45
1959 774.00 i 916.22 a 941.62 c 493.39 b 265.50 183.00 84.00 39.50 206.90 a 490.32 a 540.00 h 993.79 e 4614.24
1960 1114.21 e 523.50 o 191.00 x 459.83 a 457.50 158.00 96.50 65.50 218.00 431.23 c 730.80 e 933.00 g 3731.57
1961 1001.50 g 814.80 c 770.00 775.38 d 494.50 210.50 104.50 111.00 178.00 555.00 740.50 1050.79 b 5804.98
1962 1132.05 c 819.50 1019.50 700.86 a 157.00 176.50 88.50 97.50 295.00 482.50 848.79 a 1211.00 7028.71
1963 1212.10 a 1141.26 a 756.00 516.50 157.00 194.50 145.50 100.50 258.00 405.00 808.00 1337.00 7031.36
1964 831.50 g 1146.66 d 885.10 b 542.50 279.00 a 122.00 115.50 150.50 269.00 641.00 661.50 944.50 5757.26
1965 1032.09 b 1012.00 984.50 467.00 219.00 209.50 92.00 103.50 260.00 616.00 777.93 a 995.00 6768.52
1966 1221.52 e 1071.54 b 931.00 674.48 a 407.50 178.50 99.00 137.50 316.50 575.05 a 806.25 b 1088.88 c 7507.72
1967 1041.60 a 1101.50 782.00 496.50 460.87 a 238.50 204.00 198.50 409.00 576.08 a 955.00 915.00 7378.55
1968 1079.26 d 1247.54 b 810.77 e 573.21 b 462.86 b 148.50 101.27 a 76.50 311.00 574.03 b 816.96 b 1189.37 a 7391.27
1969 1189.00 1113.54 b 823.00 g 553.45 a 335.83 a 129.50 33.50 151.00 279.50 519.00 914.50 1228.67 e 6447.49
1970 1309.00 1025.50 907.50 520.50 287.78 a 185.00 68.50 86.00 127.50 495.50 859.50 969.50 6841.78
1971 1174.50 989.50 1059.00 582.50 446.50 111.00 132.50 117.50 190.50 407.00 867.00 773.40 b 6850.90
1972 1000.50 1051.25 c 916.50 558.00 440.00 278.00 93.00 113.50 184.00 614.50 884.00 846.50 6979.75
1973 1089.00 1044.00 744.00 699.00 448.50 151.00 70.50 121.00 180.50 454.50 697.50 1055.03 a 6754.53
1974 745.03 a 969.50 732.00 598.45 a 362.50 295.50 101.50 125.50 309.00 547.50 786.00 1021.89 c 6594.37
1975 989.93 a 880.44 a 989.00 642.50 258.33 a 171.00 110.50 48.50 278.28 a 405.00 690.50 1077.25 e 6541.24
1976 1253.50 819.50 705.00 491.00 455.50 187.50 132.27 a 137.00 317.50 715.50 1021.55 a 1156.00 7391.82
1977 1589.50 1067.00 798.00 485.00 293.00 169.00 60.00 75.00 180.50 659.00 759.50 1155.00 7290.50
1978 1405.00 1215.41 a 914.00 538.00 410.50 141.00 73.50 62.50 151.50 565.00 631.00 998.00 7105.41
1979 1302.00 1065.17 d 827.50 613.50 375.00 250.50 158.00 96.50 269.00 600.00 746.50 928.00 7231.67
1980 1096.00 1181.50 958.50 611.00 323.50 189.31 a 37.50 38.50 148.00 615.00 793.89 c 1008.02 a 7000.72
1981 1343.50 981.68 c 1028.17 a 457.50 425.00 72.50 70.50 155.50 252.00 594.00 778.00 1227.00 7385.35
1982 1248.50 905.00 794.50 731.00 223.50 182.50 60.50 120.50 316.50 532.50 733.00 887.00 6735.00
1983 1204.02 c 997.00 931.00 765.00 427.50 200.50 66.50 56.00 276.50 543.50 797.50 1189.50 7454.52
1984 1171.50 949.00 978.57 a 690.50 444.00 114.00 136.50 89.00 272.00 346.00 840.00 756.50 6787.57
1985 1414.00 987.54 b 798.50 511.00 358.00 178.00 118.00 155.50 261.00 393.50 514.50 1202.50 6892.04
1986 1178.00 886.50 864.00 503.00 368.79 b 77.50 28.00 148.50 205.50 493.50 675.00 951.91 b 6380.21
1987 1163.50 978.44 a 864.38 a 628.89 c 236.50 106.50 36.50 63.50 253.50 658.00 714.00 991.50 6695.22
1988 1263.50 1093.50 863.50 604.50 395.00 144.00 78.50 54.00 277.50 723.00 770.50 1054.50 7322.00
1989 891.00 919.50 710.50 626.00 495.50 138.50 98.50 116.50 258.50 460.00 821.50 1302.50 6838.50
1990 924.50 780.00 733.00 626.00 371.50 157.50 84.00 86.00 235.00 479.00 660.50 872.50 6009.50
1991 1060.50 898.00 824.50 513.50 247.50 182.00 51.50 120.00 273.00 497.50 828.00 929.00 6425.00
1992 1079.00 885.50 921.50 616.00 485.00 269.00 57.50 211.00 231.00 577.00 802.00 1062.00 7196.50
1993 958.50 1052.00 974.90 b 675.00 349.00 133.00 10.50 79.50 237.50 520.50 794.00 1110.50 6894.90
1994 1287.00 932.00 883.50 453.00 0.00 z 110.00 87.00 151.50 308.50 547.00 633.62 a 899.50 6292.62
1995 1140.50 1055.00 754.50 538.00 356.50 207.00 50.00 65.00 284.50 505.30 a 920.50 1199.50 7076.30
1996 1198.15 a 1044.00 1051.00 662.50 280.50 163.50 111.50 119.00 311.50 537.00 953.50 984.50 7416.65
1997 1202.05 b 911.50 723.50 733.00 520.00 288.00 57.50 168.43 a 249.00 548.00 963.50 1025.30 d 7389.78
1998 1006.95 c 994.58 d 981.84 b 639.00 286.50 142.00 64.00 84.00 169.00 434.00 701.38 a 870.50 6373.75
1999 691.00 g 942.08 d 783.00 h 532.76 a 393.00 196.00 55.50 63.50 250.50 564.00 682.00 1015.77 a 4695.11
2000 1176.50 930.00 741.00 671.00 238.50 105.00 92.00 113.50 246.00 436.00 845.50 1277.50 6872.50
2001 1162.50 853.00 1058.02 d 538.50 329.00 151.00 97.00 67.88 b 297.00 595.00 563.50 875.00 6587.40
2002 992.00 c 950.50 858.00 527.50 409.00 122.50 36.00 56.00 160.50 449.50 917.07 a 1052.34 c 6530.91
2003 1377.78 d 1009.83 e 720.48 b 550.00 398.00 192.00 66.00 50.50 263.50 591.00 591.00 757.00 j 5810.09
2004 1214.88 b 1024.28 d 810.65 a 561.35 d 239.00 141.50 85.00 146.50 240.58 d 439.50 601.03 a 1074.67 d 6578.93
2005 1007.50 b 941.50 951.46 e 562.50 b 446.00 151.00 35.00 54.50 116.50 421.71 b 615.56 c 919.00 f 5303.22
2006 943.00 1026.08 d 927.93 a 451.00 431.00 148.50 53.00 44.00 304.00 612.00 708.50 887.12 a 6536.13
2007 1065.76 b 1151.11 a 672.38 b 665.56 c 283.00 112.00 111.00 2.50 152.00 406.10 a 808.33 c 858.38 b 6288.12
2008 1156.82 a 899.54 b 890.50 573.89 c 398.00 80.00 69.00 94.50 186.00 581.00 890.50 977.02 a 6796.76
2009 1191.90 b 1024.50 752.02 b 576.72 a 357.50 86.00 135.00 53.50 236.00 520.50 664.50 646.00 l 5598.14
2010 937.50 h 677.50 l 968.23 a 437.50 254.00 40.00 21.50 22.00 139.50 489.00 761.90 a 881.50 j 3133.63
2011 1261.59 c 883.17 d 831.32 a 481.03 a 319.00 55.00 29.00 56.00 222.00 610.00 694.14 a 891.25 a 6333.50
2012 997.34 b 874.14 a 538.88 a 503.79 a 227.50 174.00 25.50 88.00 232.76 a 350.50 k 0.00 z 0.00 z 3661.92
Period of Record Statistics
MEAN 1148.93 983.79 859.48 577.76 351.86 159.93 80.82 96.16 240.39 531.33 771.11 1025.38 6892.52
S.D. 150.23 108.59 114.83 86.60 91.70 54.74 37.76 43.37 57.90 85.17 110.06 143.32 378.57
SKEW 0.13 0.27 -0.25 0.42 -0.18 0.37 0.60 0.40 -0.03 0.10 -0.03 0.17 -0.14
MAX 1589.50 1247.54 1059.00 775.38 520.00 295.50 204.00 211.00 409.00 723.00 1021.55 1337.00 7507.72
MIN 745.03 780.00 538.88 437.50 157.00 40.00 10.50 2.50 116.50 346.00 514.50 733.27 6009.50
NO YRS 51 54 51 54 55 57 57 57 58 57 53 51 42