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
1942 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
1943 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
1944 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
1945 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
1946 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
1947 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
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 1568.00 1445.50 1070.50 513.00 168.29 c 18.62 a 1.00 15.00 226.50 395.50 856.00 1396.00 7673.91
1950 1803.00 1381.50 1282.00 835.50 326.00 72.00 19.00 68.00 120.00 375.00 921.50 f 1641.50 7923.50
1951 1765.00 1371.00 1421.35 a 720.00 167.50 109.00 17.50 37.50 260.00 517.00 1188.50 1510.50 9084.85
1952 1626.50 1215.50 1248.27 a 499.50 287.50 40.50 11.00 25.50 177.00 657.00 893.04 b 1299.00 7980.30
1953 1473.57 b 1324.81 a 1060.00 730.50 273.32 a 51.72 a 11.00 4.00 170.50 286.50 796.00 1345.40 a 7527.32
1954 1675.00 909.00 1143.90 a 559.66 a 400.00 50.50 2.00 18.00 166.07 b 554.00 796.55 a 1319.50 7594.18
1955 1596.00 1449.00 1205.26 b 362.00 146.73 a 57.93 a 0.00 9.30 a 185.50 475.00 1179.00 1655.00 8320.72
1956 1679.50 1496.50 1252.50 711.50 280.00 20.50 16.50 38.50 251.50 304.50 929.46 b 1269.00 8249.96
1957 1686.50 1249.50 1075.50 550.00 295.50 64.50 0.00 30.50 229.50 556.50 987.50 1221.92 a 7947.42
1958 1337.00 1415.50 1046.00 562.50 b 209.50 143.00 28.50 55.50 162.50 397.50 901.00 1560.33 a 7818.83
1959 1708.00 1390.00 999.48 b 542.00 204.60 a 43.00 16.00 8.50 194.00 685.50 1210.50 1112.50 8114.08
1960 1525.50 1364.61 b 1411.50 564.50 259.50 77.00 9.00 12.00 222.50 479.00 873.50 1414.50 8213.11
1961 1540.00 1116.50 971.50 751.00 332.50 51.00 4.00 11.50 222.50 431.00 944.00 1517.50 7893.00
1962 1731.50 1413.00 1229.50 656.50 191.00 67.50 26.50 14.00 236.50 422.50 808.00 1336.50 8133.00
1963 1839.50 1383.00 907.00 501.00 297.50 43.00 3.50 31.00 102.00 208.50 759.50 1679.50 7755.00
1964 1332.00 1137.50 1162.50 509.00 180.12 b 56.50 4.00 66.00 200.50 483.50 883.50 1561.50 7576.62
1965 1675.00 1465.50 1474.50 676.50 155.50 19.50 12.00 49.50 368.50 434.00 a 956.00 1149.50 8436.00
1966 1910.50 1400.50 887.00 701.50 375.10 a 36.50 3.00 59.93 a 204.50 515.50 1048.00 1453.00 8595.03
1967 1483.50 1529.00 1056.50 579.50 393.50 41.00 43.00 54.00 185.00 552.50 984.00 1300.00 8201.50
1968 1551.50 1463.00 782.00 459.83 a 335.50 68.00 21.00 49.00 183.00 447.00 931.00 1466.00 7756.83
1969 1761.00 1278.50 1277.72 a 501.00 216.00 156.50 9.50 2.00 168.50 603.00 950.00 1436.00 8359.72
1970 1843.00 1374.50 1273.00 637.00 237.50 39.50 9.50 9.00 224.50 533.00 1007.00 1500.50 8688.00
1971 1804.50 1328.50 1184.50 546.50 317.50 21.50 28.00 45.00 206.50 415.00 987.00 1471.50 8356.00
1972 1833.50 1590.00 1215.00 704.00 208.00 79.00 46.00 71.00 231.50 656.50 998.00 1663.00 9295.50
1973 1490.00 1251.00 804.00 652.50 354.00 45.50 9.50 15.00 259.50 380.50 953.50 1507.00 7722.00
1974 1679.00 1413.00 1132.00 569.00 361.00 91.00 3.50 66.13 a 269.00 496.50 939.50 1297.50 8317.13
1975 1590.50 1404.00 1358.00 808.00 205.50 77.50 27.50 29.00 280.50 442.00 878.00 1377.00 8477.50
1976 1648.00 1092.50 1045.00 458.50 282.00 33.50 13.50 62.00 294.00 691.00 1127.00 1660.00 8407.00
1977 2028.00 1161.48 a 876.00 366.50 81.00 34.00 0.50 70.50 167.50 550.00 980.00 1569.50 7884.98
1978 1871.76 b 1576.30 a 1150.50 621.50 197.88 a 64.50 21.50 28.00 107.00 459.50 1021.00 1591.50 8710.94
1979 1975.00 1603.50 1191.00 669.50 343.00 53.50 6.50 57.50 159.50 577.00 1048.00 1244.43 c 8928.43
1980 1548.50 1489.50 1201.00 538.00 225.50 59.50 4.50 29.00 198.00 695.20 d 929.50 1437.50 8355.70
1981 1476.00 1209.70 a 892.50 505.00 307.50 56.00 22.00 37.50 239.00 656.34 b 901.50 1592.50 7895.55
1982 2038.50 1456.50 1185.00 729.00 169.00 142.50 3.00 59.50 237.00 554.00 0.00 z 1221.50 7795.50
1983 1414.50 1114.00 975.50 693.50 314.50 68.50 0.50 0.00 217.76 a 549.00 948.00 1973.50 8269.26
1984 1670.50 1134.00 1293.50 592.00 322.00 27.50 18.00 18.00 291.00 501.50 975.00 1509.50 8352.50
1985 1762.50 1434.50 944.00 448.50 110.00 110.50 4.00 63.50 239.50 588.50 1263.75 b 1787.00 8756.25
1986 1521.50 1419.00 987.50 484.50 225.50 34.00 0.50 76.00 220.50 526.00 1164.50 1324.00 7983.50
1987 1389.50 980.50 860.00 407.00 165.50 19.00 11.50 94.50 186.00 710.50 913.00 1367.00 7104.00
1988 1819.50 1604.00 1056.50 608.50 109.50 14.00 13.00 41.50 216.21 a 774.00 1110.50 1513.00 8880.21
1989 1450.50 1649.00 1321.00 675.00 349.00 118.00 6.00 65.00 250.00 490.00 1106.50 1714.50 9194.50
1990 1222.50 1190.00 914.50 570.50 313.50 34.50 11.50 23.00 163.00 534.00 837.50 1537.00 7351.50
1991 1673.00 1152.00 967.00 489.50 220.00 8.50 15.00 21.50 247.00 568.00 1242.50 1420.50 8024.50
1992 1370.00 1124.50 1008.00 666.00 205.00 94.00 70.00 102.50 193.50 574.50 1056.00 1409.50 7873.50
1993 1634.50 1407.50 1201.00 632.00 254.00 100.50 5.00 29.00 316.50 569.50 1044.00 1380.50 8574.00
1994 1909.50 1520.00 977.00 578.50 171.50 31.00 10.50 72.00 121.00 421.50 850.00 1302.50 7965.00
1995 1504.50 1305.00 968.50 711.50 279.00 58.50 9.00 0.00 235.50 549.00 1178.00 1467.00 8265.50
1996 1758.50 1380.50 1247.50 722.00 362.50 59.00 10.00 7.50 194.00 498.00 1216.50 1674.50 9130.50
1997 1730.50 1307.50 1180.00 658.00 386.50 15.00 36.50 35.00 122.50 509.00 1151.50 1197.12 a 8329.12
1998 1524.00 971.00 1049.50 455.00 109.50 95.00 4.50 2.00 82.50 453.50 871.00 1250.50 6868.00
1999 1685.50 1096.50 1029.00 528.00 207.50 77.50 10.50 19.00 215.00 515.00 721.00 1273.50 7378.00
2000 1604.50 1110.50 764.00 583.00 244.00 93.62 a 22.50 48.50 210.00 b 489.00 1145.17 a 1887.50 8202.29
2001 1499.00 1623.00 1255.50 563.00 244.50 73.45 a 5.50 17.50 202.50 524.93 a 614.50 1250.50 7873.88
2002 1298.00 1080.00 1285.00 619.00 353.50 45.00 0.00 15.50 160.00 736.00 989.50 1233.00 7814.50
2003 1533.50 0.00 z 1054.00 528.00 300.00 58.00 5.00 0.00 z 220.50 483.00 0.00 z 1328.50 5510.50
2004 1664.00 1292.00 920.00 479.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4355.00
2005 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
2006 0.00 z 0.00 z 0.00 z 0.00 z 255.50 18.00 h 0.00 i 11.50 221.00 g 471.50 g 479.50 m 885.50 h 267.00
2007 1177.00 g 1472.33 d 515.50 p 556.50 g 199.43 a 30.50 i 1.50 g 49.00 g 187.50 351.00 f 955.00 1590.50 4404.77
2008 1251.00 i 1509.04 a 1239.00 715.00 322.50 40.50 10.00 17.50 164.00 586.00 961.50 1685.00 7250.04
2009 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 37.50 87.50 710.00 726.00 1519.50 3080.50
2010 1713.50 1433.50 879.00 366.50 264.50 36.50 f 0.00 9.00 205.50 421.50 954.50 1588.50 7836.00
2011 1742.50 1382.50 1209.52 a 626.79 b 313.00 54.50 0.00 6.50 218.00 420.50 841.00 1224.50 8039.30
2012 1338.50 1155.50 594.50 517.00 162.50 35.00 0.00 38.00 196.50 597.50 883.00 1349.50 6867.50
2013 1538.00 1386.00 1305.50 36.50 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 4229.50
Period of Record Statistics
MEAN 1634.45 1334.15 1097.67 586.81 254.90 59.49 12.42 35.16 204.48 519.78 971.80 1451.41 8136.43
S.D. 182.41 174.66 180.42 108.60 79.56 33.19 13.10 25.25 53.77 111.31 140.13 181.68 538.65
SKEW 0.03 -0.39 -0.27 0.00 -0.12 0.95 2.03 0.57 0.10 -0.06 0.10 0.49 -0.09
MAX 2038.50 1649.00 1474.50 835.50 400.00 156.50 70.00 102.50 368.50 774.00 1263.75 1973.50 9295.50
MIN 1222.50 909.00 594.50 362.00 81.00 8.50 0.00 0.00 82.50 208.50 614.50 1112.50 6867.50
NO YRS 60 61 61 60 61 58 59 60 61 60 58 61 54