date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Apr 6, 2013
*** Note *** Provisional Data *** After Year/Month 201304
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
1954 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 762.00 1261.50 2023.50
1955 1473.50 1376.15 a 1095.50 327.50 99.00 51.96 b 0.00 a 6.72 a 159.23 d 443.82 a 1145.00 1264.50 g 6178.38
1956 1641.50 1425.30 b 1167.67 d 681.21 a 224.50 9.50 l 15.50 24.00 152.78 c 236.24 b 946.00 1238.00 7752.69
1957 1683.50 1114.00 1006.50 570.60 e 260.92 a 30.00 e 0.00 a 17.16 c 163.97 a 533.72 a 951.96 b 1179.50 7511.82
1958 1296.83 a 1394.30 a 1016.50 523.39 b 150.00 63.50 13.90 b 20.50 92.68 b 292.00 h 489.00 k 1460.00 6031.60
1959 1682.78 a 1430.59 a 1005.43 a 515.17 a 160.68 a 22.24 a 4.50 7.00 180.00 603.50 1196.50 1092.00 7900.41
1960 1448.50 1359.50 1459.50 547.00 202.00 38.28 a 5.00 4.00 178.50 445.00 826.00 1421.00 7934.28
1961 1549.00 1167.50 1021.50 721.50 324.50 24.50 0.00 11.00 203.50 401.50 951.00 e 1492.50 7868.00
1962 1718.36 b 1345.00 1254.50 384.50 l 125.00 29.00 17.50 4.50 208.50 383.00 762.00 1304.50 7151.86
1963 1816.50 1336.00 871.50 479.50 234.50 13.00 1.00 34.50 67.00 162.50 754.50 1633.50 7404.00
1964 1263.00 1089.50 1163.00 514.00 77.50 44.50 1.00 52.00 140.50 427.50 785.00 1520.50 7078.00
1965 1647.43 c 1402.50 0.00 z 0.00 z 128.00 f 5.00 0.00 51.00 291.60 e 0.00 z 633.50 l 1069.00 4466.53
1966 0.00 z 0.00 z 0.00 z 0.00 z 72.00 m 3.50 h 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1967 0.00 z 0.00 z 0.00 z 437.50 h 473.00 41.50 46.50 71.50 241.55 a 278.00 k 948.00 e 1345.73 c 3167.78
1968 1548.50 1448.50 915.00 574.00 401.50 84.50 14.00 44.00 171.50 432.45 a 922.00 1437.00 7992.95
1969 1758.50 1330.50 1405.50 562.00 262.00 157.50 9.00 2.00 148.00 566.50 923.50 1392.50 8517.50
1970 1935.00 1372.50 1216.00 592.50 238.50 38.50 17.00 17.50 209.00 535.50 932.50 1518.50 8623.00
1971 1751.00 1356.00 1191.50 549.00 339.00 23.00 42.50 36.00 196.00 317.50 903.00 1416.50 8121.00
1972 1729.50 1511.50 1088.00 701.50 205.50 78.00 38.00 94.50 219.50 574.00 945.50 1612.50 8798.00
1973 1471.50 1226.00 801.00 633.00 295.00 26.00 7.00 7.00 169.50 342.00 887.00 1478.50 7343.50
1974 1579.00 1261.50 988.00 544.00 332.00 85.50 8.00 33.50 273.00 441.00 903.00 1322.00 7770.50
1975 1467.85 a 1409.85 a 1294.00 803.00 166.00 57.50 17.50 2.50 258.00 372.50 812.00 1305.00 7965.70
1976 1558.50 1024.00 1018.35 a 459.50 272.50 29.50 8.00 15.50 178.50 685.00 1117.00 1639.50 8005.85
1977 0.00 z 1148.50 852.00 376.00 55.50 22.00 0.00 z 45.00 80.50 551.00 953.00 1489.00 5572.50
1978 1800.50 1481.00 1013.00 539.00 176.91 b 35.00 4.50 14.00 65.50 458.50 1015.00 1560.50 8163.41
1979 1961.50 1570.00 1159.00 674.50 245.79 c 33.50 0.00 35.50 82.50 489.50 969.50 1148.55 a 8369.84
1980 1465.50 1367.50 1044.38 b 498.10 a 189.00 18.00 0.50 9.00 106.50 564.00 793.00 1392.00 7447.48
1981 1143.50 g 1115.85 a 798.00 378.62 a 214.00 1.00 12.50 13.50 130.50 518.50 736.80 e 1492.00 5411.27
1982 1931.82 a 1319.63 a 1002.00 622.00 123.00 71.50 0.00 25.50 160.50 430.00 999.00 1200.00 7884.95
1983 1385.91 b 1075.50 987.00 684.50 283.50 47.50 0.00 0.00 150.50 469.28 b 884.00 1948.87 a 7916.56
1984 1531.00 1172.50 1301.00 583.00 229.00 9.50 0.00 3.00 193.00 400.50 942.22 c 1343.33 a 7708.06
1985 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 65.50 3.50 40.50 217.00 491.00 1247.59 a 1780.00 3845.09
1986 1420.00 1348.50 846.00 433.00 163.50 9.00 0.00 51.50 123.50 0.00 z 0.00 z 0.00 z 4395.00
1987 0.00 z 0.00 z 0.00 z 0.00 z 63.00 7.76 a 2.58 a 50.50 102.50 582.50 768.50 1208.00 2785.34
1988 1715.50 1458.00 881.00 517.00 50.00 5.00 0.50 14.00 75.00 606.50 901.50 1362.00 7586.00
1989 1202.50 1437.00 1087.00 527.00 193.50 53.00 0.00 5.00 172.00 426.00 1039.00 1631.00 7773.00
1990 1127.50 1093.00 860.00 538.00 252.50 32.00 7.50 8.00 112.50 485.50 773.50 1515.00 6805.00
1991 1654.00 1074.00 900.50 451.50 187.50 5.00 5.50 8.50 182.00 505.50 1188.00 1265.00 7427.00
1992 1239.00 1059.50 891.50 616.50 174.50 36.50 44.50 63.50 148.50 514.00 1016.50 1376.50 7181.00
1993 1592.50 1378.00 1193.00 634.50 221.50 61.00 1.00 17.00 257.00 519.50 1002.50 1334.00 8211.50
1994 1835.00 1480.50 884.50 525.50 155.00 7.00 4.50 37.00 95.50 380.50 808.50 1318.50 7532.00
1995 1475.50 1189.50 950.00 662.00 262.00 42.50 6.00 0.00 199.00 484.50 1087.00 1330.00 7688.00
1996 1640.50 1255.50 1122.00 638.50 318.00 38.00 4.50 3.50 191.00 431.00 1170.50 1580.00 8393.00
1997 1645.00 1208.50 976.00 625.50 321.00 1.00 16.00 15.50 93.00 434.00 1098.00 1164.57 a 7598.07
1998 1429.00 958.50 1061.00 447.50 75.00 0.00 x 1.50 0.00 z 72.00 449.50 822.41 a 1229.00 6545.41
1999 1687.00 1043.00 967.50 555.52 a 195.50 57.50 0.00 b 17.00 198.00 545.50 695.00 1269.50 7231.02
2000 1556.00 1090.00 771.50 569.00 171.50 71.25 b 21.00 18.00 173.50 427.00 1112.50 1857.33 b 7838.58
2001 1485.50 1493.50 1242.50 520.50 216.50 60.00 b 4.00 14.50 195.50 516.00 543.50 1156.50 7448.50
2002 1297.50 1169.00 1246.00 0.00 z 0.00 z 0.00 z 4.00 25.00 151.50 717.50 1043.00 1215.00 6868.50
2003 1534.00 1386.50 1062.50 543.00 287.00 54.00 5.00 2.98 e 191.40 e 487.00 1011.00 1300.00 7864.38
2004 931.50 l 1364.00 874.00 515.50 259.50 55.00 f 24.50 102.50 84.60 e 477.00 846.50 1314.00 5862.10
2005 1593.40 a 1058.00 774.50 h 443.50 306.50 1.50 g 13.00 25.50 96.00 g 471.50 865.00 1575.66 b 6352.06
2006 776.00 k 146.00 y 0.00 z 389.50 261.00 35.00 3.00 3.50 185.00 f 612.00 906.50 1176.00 3386.50
2007 1512.80 a 1634.35 e 860.25 e 641.00 110.00 10.00 f 0.50 3.00 f 121.00 i 377.50 929.50 1567.16 c 7633.06
2008 1676.07 a 1017.50 i 1172.50 694.50 238.00 g 15.00 0.50 10.00 f 138.50 539.50 953.50 1651.30 c 6841.37
2009 1790.85 e 653.00 m 1044.50 625.50 190.00 g 58.50 h 0.00 z 0.00 z 92.50 g 720.50 740.00 1601.31 b 6522.66
2010 1733.62 e 806.50 m 794.50 f 392.00 265.50 16.80 e 0.00 f 5.50 m 124.00 f 415.50 939.60 e 1570.00 5333.02
2011 1161.00 i 1346.24 c 637.50 m 615.00 b 281.67 b 49.62 d 0.00 a 7.50 f 161.50 h 431.86 b 708.00 g 1235.02 c 3959.41
2012 688.00 n 1113.28 b 584.23 e 470.40 e 132.02 b 11.40 e 0.00 a 13.00 g 120.00 g 572.95 c 555.00 j 1314.63 d 4198.90
2013 848.50 m 1318.15 b 998.00 f 35.00 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 1318.15
Period of Record Statistics
MEAN 1582.07 1286.03 1032.92 553.83 217.00 38.31 8.45 24.51 160.92 479.35 927.83 1403.77 7797.20
S.D. 191.62 162.26 173.78 99.48 88.43 28.67 11.71 23.55 56.34 103.97 142.02 190.45 442.90
SKEW -0.23 -0.13 0.17 -0.03 0.23 1.49 1.95 1.47 0.11 -0.20 0.04 0.58 0.14
MAX 1961.50 1634.35 1459.50 803.00 473.00 157.50 46.50 102.50 291.60 720.50 1247.59 1948.87 8798.00
MIN 1127.50 958.50 584.23 327.50 50.00 1.00 0.00 0.00 65.50 162.50 543.50 1069.00 6805.00
NO YRS 48 51 49 51 52 50 54 50 50 53 53 56 35