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
1952 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 19.50 l 80.00 237.50 738.00 974.50 1285.00 3315.00
1953 1475.00 1357.00 1136.00 842.50 453.63 a 108.75 b 43.00 34.00 250.50 369.42 a 844.50 1376.00 8290.30
1954 1681.50 1037.50 1281.50 714.50 576.50 122.50 50.50 97.00 309.00 644.50 927.50 1322.00 8764.50
1955 1588.50 1418.00 1355.50 517.00 284.50 132.00 19.00 27.00 247.00 504.50 1191.50 1597.00 8881.50
1956 1489.00 1401.00 1263.50 815.00 c 307.50 f 105.00 110.50 76.00 335.69 a 354.43 a 999.00 1380.00 8329.12
1957 1789.50 1366.50 1246.50 690.50 405.00 147.00 23.50 75.00 302.50 565.00 1004.00 1366.50 8981.50
1958 1412.50 1463.00 1170.50 650.50 386.50 219.64 b 67.50 100.50 197.00 516.00 962.00 1669.50 8815.14
1959 1822.00 1455.50 1160.50 735.50 316.00 112.00 39.00 38.50 234.50 692.00 1266.00 1199.00 9070.50
1960 1558.50 1377.50 a 1434.00 486.50 f 449.50 161.50 73.50 44.50 259.00 531.00 902.50 1533.00 8324.50
1961 1643.00 1162.50 1077.00 796.50 467.50 156.50 52.00 30.00 272.50 524.50 974.00 1478.50 8634.50
1962 1741.00 1499.00 1145.00 814.50 333.00 188.79 a 64.50 68.50 305.69 a 522.35 a 906.50 1472.50 9061.33
1963 1887.00 1573.50 1115.50 664.50 436.50 138.50 30.00 105.00 208.00 255.00 850.00 1642.50 8906.00
1964 1333.00 1297.00 1289.50 721.00 232.00 179.00 42.00 151.00 303.50 568.50 937.00 1622.85 a 8676.35
1965 1745.50 1582.54 b 296.00 y 749.44 c 269.38 b 141.50 89.50 101.50 385.50 528.50 992.00 1225.50 7810.86
1966 1819.50 1324.50 1003.50 775.50 486.50 92.00 12.50 103.00 262.50 573.50 1032.00 1437.00 8922.00
1967 1523.50 1568.50 1127.00 723.50 574.50 161.50 70.50 108.00 211.50 628.50 1077.50 1363.00 9137.50
1968 1615.50 1513.00 942.00 659.00 478.50 192.00 64.00 96.00 212.00 497.50 994.00 1487.50 8751.00
1969 1605.00 1339.50 1328.00 693.50 402.50 321.50 98.00 29.00 248.00 665.50 993.00 1355.50 9079.00
1970 1802.50 1461.50 1317.00 681.50 520.50 155.00 37.50 51.00 275.50 504.00 1010.00 1480.50 9296.50
1971 1828.50 1418.00 1270.50 749.50 511.00 105.50 87.00 146.50 236.00 420.50 985.00 1430.50 9188.50
1972 1848.24 b 1634.00 1395.00 907.50 319.50 200.50 83.00 132.50 354.00 692.50 1025.00 1579.50 10171.24
1973 1437.00 1326.50 944.50 742.50 521.50 89.50 70.50 56.00 323.50 422.00 992.00 1479.00 8404.50
1974 1648.50 1440.00 1170.00 749.50 448.00 178.50 h 20.67 a 103.00 409.00 540.00 902.50 1214.00 8645.17
1975 1522.00 1294.00 1239.00 894.50 287.50 133.50 57.50 h 48.50 g 359.00 478.00 857.00 1467.00 8531.50
1976 1655.50 1135.00 1144.50 595.50 430.50 74.00 51.50 71.50 309.00 0.00 z 0.00 z 0.00 z 5467.00
1977 1924.50 1258.50 924.00 578.00 157.50 134.50 13.50 q 163.78 a 262.50 581.50 947.50 1477.50 8409.78
1978 1750.50 1478.50 1187.00 796.55 a 347.00 165.50 68.50 67.00 197.00 525.00 1028.00 1583.00 9193.55
1979 1919.50 1577.00 1154.00 783.50 533.00 184.50 57.35 a 94.00 208.00 670.63 a 973.00 1237.50 9391.98
1980 1601.50 1177.00 g 1274.00 643.89 c 282.50 166.50 25.50 33.00 269.00 670.50 912.00 1492.50 7370.89
1981 1516.00 1218.00 1048.00 629.50 419.50 111.50 54.00 30.00 287.07 a 655.00 797.00 1346.50 8112.07
1982 1890.00 1357.50 1123.00 770.50 271.50 263.50 27.00 137.00 282.50 515.63 a 1021.03 a 1202.00 8861.17
1983 1400.00 1070.00 1048.50 802.50 500.00 172.50 18.00 7.50 203.00 557.00 905.50 1761.00 8445.50
1984 1636.50 1064.00 1352.00 649.50 452.00 116.50 58.00 40.50 312.00 433.50 845.17 a 1387.00 8346.67
1985 1606.50 1388.50 934.50 580.50 320.00 210.50 62.50 119.50 277.50 534.50 1109.00 1725.50 8869.00
1986 1462.68 a 1346.50 1010.08 a 563.79 a 339.28 d 164.50 33.50 142.00 301.50 506.00 994.00 1211.50 8075.34
1987 1236.50 928.50 901.00 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 3066.00
1988 1724.00 1614.50 1179.00 712.50 265.00 104.50 30.50 64.00 232.00 775.00 996.50 1496.00 9193.50
1989 1437.00 1605.00 1349.50 792.50 401.00 207.00 35.50 60.00 244.50 575.50 1174.50 1837.00 9719.00
1990 1322.00 1300.00 1054.00 665.00 494.50 114.00 126.00 115.50 300.00 690.00 902.00 1496.50 8579.50
1991 1730.00 1224.00 1104.00 589.50 301.00 94.00 55.00 76.00 313.00 687.00 1181.00 1421.50 8776.00
1992 1461.00 1238.50 1203.50 817.00 313.50 229.50 157.50 149.50 297.00 678.00 1088.50 1439.00 9072.50
1993 1598.00 1416.50 1235.00 864.31 a 443.50 243.00 37.50 78.00 438.00 750.50 1140.50 1412.50 9657.31
1994 2001.50 1610.00 1150.00 777.00 413.50 130.00 68.00 122.00 203.50 522.00 911.00 1273.00 9181.50
1995 1552.00 1424.00 1137.00 915.00 433.00 144.00 61.00 24.00 327.50 614.50 1318.50 1591.00 9541.50
1996 1835.00 1577.50 1475.50 976.00 540.00 178.00 119.50 66.00 295.50 602.50 1206.50 1517.50 10389.50
1997 1744.50 1353.50 1264.50 837.50 616.50 88.00 85.50 158.00 222.00 598.00 1127.00 1236.50 9331.50
1998 1467.50 959.50 1202.00 649.50 295.00 188.00 43.00 42.00 168.50 549.50 915.00 1356.50 7836.00
1999 1714.50 1163.00 1176.00 706.00 327.00 153.00 31.50 64.50 292.50 689.50 814.50 1351.50 8483.50
2000 1631.63 a 1205.50 962.00 0.00 z 376.00 231.00 96.00 51.50 314.00 463.00 988.00 1794.50 8113.13
2001 1461.00 1572.50 1299.00 698.50 333.50 176.50 102.50 66.00 350.50 674.00 744.00 1274.50 8752.50
2002 1461.50 1215.00 1514.50 875.50 599.50 186.50 45.00 96.00 272.50 871.50 1128.00 1403.00 9668.50
2003 1770.00 1603.00 1334.00 893.50 482.50 230.00 91.50 64.50 272.50 683.00 1118.00 1389.50 9932.00
2004 1869.50 1393.00 1151.00 828.00 559.50 279.00 133.00 261.00 176.00 602.50 953.00 1553.50 9759.00
2005 1755.50 1277.00 1356.50 653.50 347.50 m 0.00 z 18.50 z 114.50 219.00 546.08 e 1032.00 1509.50 8463.58
2006 1313.50 1533.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 71.50 373.50 0.00 z 976.00 1298.50 5566.50
2007 1573.00 1699.50 1113.50 848.00 335.50 109.50 82.00 78.50 291.00 564.00 1103.00 1613.50 9411.00
2008 1661.50 1641.50 1456.00 906.50 594.50 216.50 80.00 122.00 298.00 689.50 1129.50 1760.00 10555.50
2009 1964.50 1432.00 1276.00 844.00 491.00 253.00 191.50 172.50 164.50 833.00 861.00 1627.00 10110.00
2010 1640.50 1503.00 1024.50 654.00 383.50 215.00 30.00 68.00 159.00 r 570.50 935.50 1491.10 a 8515.60
2011 1709.00 1368.50 1257.00 732.00 481.53 a 178.50 23.25 c 28.93 a 275.50 489.59 b 917.07 a 1254.47 a 8715.34
2012 1415.00 1168.70 d 727.43 b 753.75 b 293.97 b 100.00 c 9.19 d 83.18 a 298.39 b 472.50 h 0.00 z 0.00 z 4849.61
Period of Record Statistics
MEAN 1637.15 1376.79 1181.27 744.12 410.49 163.86 62.52 85.71 276.06 580.77 996.41 1453.19 9065.05
S.D. 178.95 179.18 157.20 102.37 106.46 54.09 37.15 46.36 58.16 115.19 117.57 159.25 601.48
SKEW -0.06 -0.45 -0.28 0.01 -0.02 0.58 1.15 1.02 0.34 -0.05 0.49 0.39 0.45
MAX 2001.50 1699.50 1514.50 976.00 616.50 321.50 191.50 261.00 438.00 871.50 1318.50 1837.00 10555.50
MIN 1236.50 928.50 727.43 517.00 157.50 74.00 9.19 7.50 164.50 255.00 744.00 1199.00 7836.00
NO YRS 60 59 58 56 56 56 55 59 59 57 58 58 46