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
1946 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 9.00 o 66.50 260.50 461.00 986.79 b 1445.63 a 3220.42
1947 1502.00 1488.15 a 1251.50 752.00 334.50 m 147.50 45.50 16.02 a 256.50 283.50 1187.00 1552.14 b 8481.80
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 82.24 a 27.26 b 41.00 162.00 589.00 900.00 1511.00 3312.50
1949 1576.50 1479.50 1239.50 667.00 286.00 45.00 11.50 34.50 338.00 488.00 998.50 1504.00 8668.00
1950 1807.30 a 1497.50 1436.50 924.00 409.50 146.00 86.00 164.50 242.00 436.07 a 1164.11 b 1808.50 10121.97
1951 1795.00 1468.00 1418.00 775.00 264.50 165.50 48.00 106.50 360.50 611.50 1314.00 1546.50 9873.00
1952 1673.00 1319.50 1320.00 608.00 400.79 c 80.50 40.50 64.00 254.50 773.00 958.45 a 1343.50 8835.73
1953 1537.00 1483.00 1208.50 792.50 323.50 74.50 37.00 26.72 b 244.50 382.50 868.50 1403.50 8381.72
1954 1736.50 1113.50 1264.00 676.00 528.00 85.50 29.00 58.50 291.00 626.72 a 922.50 1400.50 8731.72
1955 1700.50 1504.50 1377.50 490.50 231.50 105.50 3.50 22.50 242.50 576.08 a 1192.50 d 1736.50 9183.58
1956 1646.50 1602.50 1395.50 814.00 398.50 77.00 73.00 70.00 332.50 401.89 c 1066.00 1432.00 9309.39
1957 1911.50 1409.50 1207.50 662.00 397.50 107.50 17.50 86.50 336.50 650.50 1076.90 a 1478.00 9341.40
1958 1550.00 1584.50 1118.00 654.00 367.50 227.50 62.50 84.00 240.00 527.50 975.00 1716.88 a 9107.38
1959 1859.48 a 1587.50 1252.50 692.50 265.50 89.00 59.50 21.50 251.00 726.50 1336.50 1245.50 9386.98
1960 1559.50 1432.50 1528.00 685.00 389.50 153.00 67.50 29.50 253.00 579.00 963.00 1570.50 9210.00
1961 1668.00 1207.50 1103.50 816.50 446.00 125.50 40.50 42.00 303.00 592.21 b 1108.00 1067.50 k 7452.71
1962 1869.50 1537.41 a 1274.50 785.00 302.00 140.00 97.00 85.50 384.00 588.00 1006.07 b 1569.00 9637.98
1963 1984.50 1636.00 1136.00 612.00 407.50 105.00 38.00 110.00 275.00 320.00 898.50 1826.00 9348.50
1964 1582.00 1375.00 1230.70 a 634.00 241.50 130.50 30.50 g 159.00 331.50 674.50 940.00 1707.00 9005.70
1965 1808.00 1583.00 1429.50 808.50 270.50 128.00 78.50 133.00 410.50 637.50 1050.50 1321.50 9659.00
1966 2049.00 1473.00 1117.50 822.22 c 552.00 136.00 45.98 a 169.47 a 292.24 a 618.00 1055.00 1505.00 9835.41
1967 1591.50 1650.38 b 1253.50 689.00 537.50 90.00 82.50 150.00 278.00 650.00 1111.50 1430.00 9513.88
1968 1661.00 1575.50 944.47 a 623.28 a 441.00 162.00 72.50 91.00 227.00 538.00 978.50 1532.00 8846.24
1969 1803.50 1395.50 1348.50 586.00 322.00 260.00 34.00 17.50 246.50 681.00 1029.00 1444.50 9168.00
1970 1904.50 1506.50 1323.00 663.50 339.00 80.00 37.00 43.92 a 244.50 481.50 1030.50 1475.00 9128.92
1971 1910.50 1466.50 1325.50 709.14 a 406.62 a 67.50 61.00 90.50 230.50 387.50 972.00 1477.00 9104.25
1972 1933.50 1649.00 1377.50 816.50 234.00 135.50 68.50 85.50 252.00 727.00 1026.50 1684.50 9990.00
1973 1574.50 1340.00 856.50 722.50 475.00 52.00 19.00 37.00 276.00 445.00 1017.50 1536.00 8351.00
1974 1673.00 1481.50 1225.50 687.50 462.50 189.50 13.50 64.00 400.50 652.50 942.50 1342.50 9135.00
1975 1637.00 1431.00 1413.50 898.00 272.50 146.50 56.00 69.50 362.00 532.34 b 856.03 a 1500.00 9174.38
1976 1857.00 1304.50 1235.50 612.50 407.50 67.00 30.48 a 89.50 348.50 789.50 1274.50 1884.00 9900.48
1977 2170.00 a 1462.46 b 1000.50 532.00 157.58 a 120.56 c 30.48 a 161.00 266.00 664.00 1067.00 1603.22 a 9234.80
1978 1874.00 1647.00 1320.50 755.50 313.88 c 147.00 63.00 58.00 213.00 681.50 1089.50 1668.12 b 9831.00
1979 2002.17 b 1636.00 1216.50 754.00 467.00 112.00 21.00 79.00 210.00 681.00 1058.50 1358.50 9595.67
1980 1682.00 1531.00 1339.20 a 624.00 271.00 131.50 17.00 38.50 294.00 744.50 989.50 1525.50 9187.70
1981 1618.50 1277.50 1048.00 611.50 365.00 95.00 37.00 39.00 303.50 710.00 885.50 1558.50 8549.00
1982 1983.00 1488.50 1261.00 804.50 194.50 213.50 13.50 96.50 296.50 573.50 1058.00 1299.00 9282.00
1983 1509.50 1157.00 1051.50 774.00 484.50 115.00 15.00 2.50 251.00 580.50 947.00 1935.00 8822.50
1984 1753.50 1138.00 1331.50 604.50 420.00 34.50 34.00 29.00 303.00 499.50 1030.50 1502.50 8680.50
1985 1768.50 1491.00 996.00 559.50 205.50 167.50 27.50 76.50 279.50 623.00 1202.50 1882.50 9279.50
1986 1639.00 1466.50 1105.50 526.00 259.00 93.50 27.00 106.00 244.00 607.00 1160.50 1395.50 8629.50
1987 1493.00 1130.00 948.50 515.00 260.50 71.00 23.50 71.50 221.50 782.50 897.00 1293.50 7707.50
1988 1790.50 1630.50 1142.35 a 676.00 201.50 70.00 11.50 51.50 251.00 800.00 983.50 1519.50 9127.85
1989 1503.00 1685.00 1356.00 761.50 381.00 156.00 15.50 54.50 276.50 578.00 1203.00 1892.00 9862.00
1990 1348.00 1401.50 1070.50 638.00 424.00 83.00 36.50 48.50 203.50 677.00 903.50 1534.00 8368.00
1991 1798.00 1323.50 1115.00 564.00 270.50 27.00 41.50 41.50 344.50 662.00 1236.50 1471.00 8895.00
1992 1488.50 1223.50 1198.50 779.00 303.00 164.50 106.50 138.50 323.50 650.50 1045.50 1436.00 8857.50
1993 1689.50 1453.00 1205.50 797.50 354.00 168.50 20.50 42.50 442.50 688.72 a 1087.50 1433.50 9383.22
1994 2019.00 1581.50 1091.50 704.00 320.00 84.00 47.00 104.00 183.50 507.00 888.00 1306.00 8835.50
1995 1614.00 1446.00 1073.50 847.00 365.80 a 71.50 41.00 7.00 307.00 607.60 a 1292.00 1623.50 9295.90
1996 1804.50 1514.50 1391.50 821.00 433.00 92.00 51.50 34.50 269.50 605.50 1230.00 1536.00 9783.50
1997 1753.50 1305.50 1206.50 724.50 497.50 52.50 64.00 118.00 205.50 598.50 1102.50 1257.50 8886.00
1998 1458.50 1003.00 1092.50 523.50 166.00 150.00 10.00 7.00 131.00 541.00 880.00 1284.50 7247.00
1999 1733.50 1151.11 a 1078.00 559.50 233.00 103.50 6.72 a 54.77 a 288.00 654.00 802.24 a 1371.00 8035.34
2000 1653.00 1244.50 847.33 a 677.59 a 284.00 124.00 38.75 a 29.50 275.00 489.50 1022.50 1814.50 8500.17
2001 1449.50 1497.50 1203.00 589.00 269.18 a 112.50 30.50 21.00 262.50 609.50 661.00 1212.50 7917.68
2002 1318.00 1119.00 1301.00 711.00 461.50 73.00 6.00 25.00 183.00 728.00 1029.50 1313.50 8268.50
2003 1656.50 1468.50 1113.00 667.00 322.00 94.00 27.50 15.50 231.00 590.00 1027.00 1306.00 8518.00
2004 1769.00 1311.69 c 1045.50 621.50 395.00 145.50 39.00 177.00 120.00 546.24 b 900.00 b 1412.64 b 8483.07
2005 1626.00 1197.00 1234.00 525.50 386.50 15.00 17.00 38.50 139.50 522.50 959.00 1482.50 8143.00
2006 1218.00 1385.50 1060.50 472.50 329.00 83.50 7.00 38.50 318.00 747.00 907.00 1233.00 7799.50
2007 1480.00 1578.50 1015.50 669.50 237.00 75.00 36.00 59.00 225.50 452.00 1014.00 1603.00 8445.00
2008 1664.50 1614.00 1350.00 718.50 429.00 100.50 23.50 45.00 o 199.00 643.50 1020.50 1751.50 9514.50
2009 1989.50 1378.50 1187.50 711.00 364.00 172.00 110.00 f 123.00 192.50 789.50 812.00 1520.50 9240.00
2010 1632.50 1370.96 a 910.00 480.00 320.00 96.00 2.50 23.00 311.50 538.50 984.00 1589.00 8257.96
2011 1801.50 1450.17 d 1285.50 762.50 379.00 111.50 6.00 33.50 304.50 521.00 901.50 1343.50 8900.17
2012 1513.50 1226.50 647.26 b 619.50 246.00 75.50 2.50 84.50 307.00 484.00 h 0.00 z 0.00 z 4722.26
Period of Record Statistics
MEAN 1701.95 1424.13 1191.57 682.46 346.08 112.16 37.19 67.54 270.21 595.78 1022.49 1510.73 8975.48
S.D. 187.61 160.74 165.02 105.28 94.77 46.91 24.42 44.48 63.97 113.79 130.09 176.50 620.27
SKEW 0.03 -0.58 -0.64 -0.01 0.11 0.62 0.74 0.80 0.14 -0.45 0.28 0.58 -0.40
MAX 2170.00 1685.00 1528.00 924.00 552.00 260.00 106.50 177.00 442.50 800.00 1336.50 1935.00 10121.97
MIN 1218.00 1003.00 647.26 472.50 157.58 15.00 2.50 2.50 120.00 283.50 661.00 1212.50 7247.00
NO YRS 65 65 65 65 64 66 64 66 67 66 66 65 59