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
1948 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
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 0.00 z 0.00 z 0.00 z 0.00
1950 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
1951 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
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 190.00 c 663.40 a 845.00 1210.00 2908.40
1953 1328.00 1274.50 1043.50 715.50 305.00 43.00 16.50 13.00 202.00 408.50 805.50 1280.50 7435.50
1954 1551.00 1024.50 1159.50 627.00 509.43 a 85.50 26.00 71.00 226.00 565.00 863.50 1323.50 8031.93
1955 1542.00 1340.50 1210.00 476.00 242.50 65.00 5.50 21.00 210.50 492.50 1042.50 1478.50 8126.50
1956 1441.50 1345.91 a 1230.50 715.50 349.00 67.50 32.00 45.50 285.00 393.00 951.00 1302.00 8158.41
1957 1713.00 1238.00 1075.50 610.00 347.50 56.50 5.68 a 41.00 273.50 596.00 567.00 l 1296.00 7252.68
1958 1401.50 1382.00 1038.50 625.00 338.00 182.50 24.00 28.93 a 180.50 461.56 d 870.00 1546.00 8078.49
1959 1705.00 1440.00 1181.50 627.00 185.50 39.00 16.50 1.50 160.50 615.00 1134.31 a 1117.00 8222.81
1960 1365.50 1249.50 1308.50 563.50 304.50 83.50 30.48 a 22.50 176.50 514.50 819.50 1372.00 7810.48
1961 1493.00 1072.50 699.00 h 697.00 374.50 65.50 15.00 14.50 207.50 440.50 915.50 1422.50 6718.00
1962 1613.00 1371.50 1110.00 625.50 217.50 85.00 13.00 35.00 255.50 451.00 654.00 i 1395.50 7172.50
1963 1803.00 1484.00 1059.50 522.41 a 341.50 53.28 a 5.00 48.50 173.50 247.00 788.00 1547.42 a 8073.11
1964 1335.00 1185.00 1110.50 577.00 156.50 96.50 10.50 94.50 244.00 580.00 827.00 1472.50 7689.00
1965 1564.00 1354.50 1251.00 739.00 178.00 110.69 a 30.00 57.50 288.62 a 474.00 877.00 1119.00 8043.31
1966 1685.00 1214.00 946.00 682.00 397.50 67.00 8.00 44.50 201.50 522.50 905.00 1314.40 a 7987.40
1967 1429.50 1459.00 1107.50 598.50 446.50 42.50 45.50 83.00 214.00 542.50 1007.00 1323.50 8299.00
1968 1490.00 1379.50 815.00 550.50 329.00 74.00 23.50 68.50 112.50 434.50 876.50 1343.00 7496.50
1969 1552.50 1203.00 1186.00 550.50 253.50 219.50 29.00 8.50 205.00 548.00 939.50 1295.00 7990.00
1970 1675.00 875.50 i 1148.50 600.00 b 309.00 63.00 16.50 18.50 183.00 436.00 920.00 1341.00 6710.50
1971 1682.00 1308.00 1186.00 621.00 348.00 47.00 28.00 56.00 145.00 296.00 859.00 1256.00 7832.00
1972 1650.50 1401.00 1212.50 744.00 192.50 85.50 29.50 35.00 177.50 576.50 898.00 1452.00 8454.50
1973 1359.00 1169.00 772.50 630.00 367.50 11.50 0.60 e 16.50 165.50 311.00 891.50 1346.50 7041.10
1974 1457.00 1269.00 1046.00 596.40 e 396.00 118.50 3.00 50.00 350.00 561.00 890.50 1258.08 a 7995.48
1975 1482.12 b 1340.37 a 1261.50 824.50 210.50 88.00 31.00 48.50 324.00 473.00 767.00 1357.50 8207.99
1976 1662.63 a 1173.00 1078.00 528.50 343.00 32.59 a 8.50 78.00 283.50 723.00 1155.50 1706.72 d 8772.94
1977 1936.43 b 1267.00 884.00 520.00 121.50 123.50 6.00 89.00 191.00 570.92 a 938.00 1467.00 8114.35
1978 1661.50 1447.00 1168.00 716.00 281.00 104.50 43.50 28.50 177.50 604.50 983.50 1503.00 8718.50
1979 1843.50 1564.00 1144.00 707.00 394.50 96.00 22.00 63.50 187.00 660.50 993.50 1243.00 8918.50
1980 1483.00 1384.00 1202.00 584.50 230.50 120.52 a 9.50 21.00 249.00 720.00 922.00 1432.00 8358.02
1981 1523.00 1208.00 953.50 563.00 354.00 58.50 31.00 26.00 256.00 657.50 840.00 1355.00 7825.50
1982 1842.00 1377.50 1151.50 737.50 164.00 172.50 8.50 90.00 287.00 542.00 983.00 1162.00 8517.50
1983 1356.00 1078.50 1000.00 705.00 469.00 123.00 15.00 10.00 235.50 547.50 855.00 1717.00 8111.50
1984 1612.50 1080.50 1246.50 571.00 387.00 22.00 26.00 42.50 318.00 546.00 1017.50 1420.00 8289.50
1985 1702.00 1440.50 1034.50 606.50 249.00 145.34 a 17.50 66.50 226.50 552.50 1072.00 1696.50 8809.34
1986 1517.50 1315.00 1019.00 484.00 223.50 0.00 z 15.00 81.50 199.00 577.50 1092.00 1286.00 7810.00
1987 1382.00 1092.50 948.00 505.50 272.00 41.00 21.00 50.00 170.00 0.00 z 837.50 1164.50 6484.00
1988 1674.52 a 1474.50 1083.50 607.00 201.00 45.50 1.50 24.50 192.50 714.50 884.00 1420.50 8323.52
1989 1363.50 1489.00 1304.50 718.00 352.50 139.50 20.00 32.50 248.00 523.50 1069.00 1731.00 8991.00
1990 1280.00 1276.50 1021.50 610.00 425.00 88.50 30.50 46.00 184.00 626.00 829.50 1438.50 7856.00
1991 1675.00 1228.00 1051.00 558.00 267.00 37.50 27.50 28.50 308.50 594.50 1113.50 1386.50 8275.50
1992 1371.50 1163.50 1106.00 745.50 309.00 153.50 71.50 107.50 273.00 632.50 1040.00 1374.50 8348.00
1993 1551.50 1343.00 1117.00 760.50 307.50 120.50 4.50 33.00 343.45 a 630.00 1009.50 1315.00 8535.45
1994 1857.00 1505.50 1042.00 657.00 291.50 60.50 27.00 74.50 133.50 481.00 825.00 1205.50 8160.00
1995 1441.00 1324.50 1026.50 796.50 336.50 49.00 18.00 1.00 301.50 516.50 1172.50 1497.00 8480.50
1996 1623.00 1426.00 1294.00 742.00 432.00 79.50 22.00 24.00 206.50 560.00 1110.00 1411.00 8930.00
1997 1609.00 1227.00 1118.00 681.00 473.00 50.50 35.50 82.00 168.50 552.50 1004.50 1161.50 8163.00
1998 1380.00 980.00 1016.50 530.50 0.00 z 129.00 3.00 3.50 93.50 492.50 810.00 1175.00 6613.50
1999 1628.00 1078.50 998.00 570.50 211.00 88.00 0.00 55.50 0.00 z 614.00 772.00 1325.00 7340.50
2000 1532.00 1198.00 809.00 655.50 254.00 108.00 34.00 21.50 257.50 507.00 988.50 82.00 z 6365.00
2001 818.50 m 1343.50 1127.00 523.00 213.00 105.50 19.50 6.50 229.00 569.50 675.00 1136.50 5948.00
2002 1236.50 1058.00 1229.00 648.50 451.50 74.50 6.00 15.50 133.50 676.50 975.50 1246.50 7751.50
2003 1571.50 1465.85 a 1121.50 698.00 345.00 94.50 15.00 9.00 198.00 548.00 937.00 1212.50 8215.85
2004 1669.00 1293.50 982.00 601.00 375.50 109.50 31.50 101.50 86.50 501.00 814.50 1349.00 7914.50
2005 1557.50 1128.00 1185.00 529.00 362.50 14.00 12.50 13.50 110.50 457.00 911.00 1433.00 7713.50
2006 1140.00 1285.00 1022.00 471.00 278.00 54.50 1.50 14.50 238.50 670.00 836.50 1169.00 7180.50
2007 1319.00 1442.54 b 957.50 652.00 226.00 46.50 17.00 31.50 170.50 386.00 941.50 1445.50 7635.54
2008 1533.50 1506.00 1207.50 614.00 393.50 40.00 5.50 18.50 145.50 530.00 909.50 1593.00 8496.50
2009 1759.00 1223.50 1112.50 640.00 276.50 111.00 27.50 46.00 103.50 675.00 737.50 1424.50 8136.50
2010 1476.00 1173.00 845.00 452.00 263.50 54.00 1.50 17.50 234.00 443.50 874.50 1398.50 7233.00
2011 1575.00 1288.00 1145.50 713.00 328.50 74.50 0.00 b 1.03 a 243.50 444.50 837.50 1152.17 a 7803.20
2012 1342.50 1090.00 607.60 a 563.50 175.00 39.50 2.00 21.50 224.50 412.00 h 0.00 z 0.00 z 4066.10
Period of Record Statistics
MEAN 1542.47 1287.18 1081.67 624.72 307.41 82.32 18.38 40.01 212.66 536.45 921.73 1361.41 8113.32
S.D. 166.34 140.44 138.11 86.39 89.10 42.28 13.61 28.12 61.56 101.67 109.46 149.72 438.98
SKEW 0.05 -0.16 -0.92 0.13 0.08 0.86 1.02 0.64 0.14 -0.48 0.38 0.56 -0.19
MAX 1936.43 1564.00 1308.50 824.50 509.43 219.50 71.50 107.50 350.00 723.00 1172.50 1731.00 8991.00
MIN 1140.00 980.00 607.60 452.00 121.50 11.50 0.00 1.00 86.50 247.00 675.00 1117.00 7041.10
NO YRS 59 59 59 60 59 59 60 60 60 59 58 59 49