date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Apr 4, 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
1898 0.00 z 0.00 z 0.00 z 0.00 z 361.00 0.00 z 82.50 101.00 271.50 0.00 z 0.00 z 0.00 z 816.00
1899 0.00 z 0.00 z 0.00 z 765.00 400.50 78.50 26.00 100.00 369.00 738.00 899.00 1716.00 5092.00
1900 1730.50 1974.50 1544.50 480.00 267.50 116.00 74.50 21.00 345.50 558.50 1443.00 1674.50 10230.00
1901 2009.50 1792.00 1386.00 705.50 271.00 183.00 25.00 108.50 430.50 669.00 1293.00 1751.50 10624.50
1902 1713.00 0.00 z 0.00 z 836.50 361.50 212.00 22.00 110.00 402.50 712.50 1237.00 1895.50 7502.50
1903 1939.00 1770.50 1452.50 758.00 365.50 129.50 76.47 a 147.00 467.22 c 643.25 a 1318.50 1949.38 a 11016.82
1904 2143.65 a 2167.50 1619.75 a 913.89 c 322.40 a 130.34 a 80.08 a 148.80 a 423.10 a 661.85 a 956.38 a 1824.87 a 11392.62
1905 2204.10 a 1765.17 d 1262.14 c 821.90 a 468.50 230.50 55.80 a 51.00 216.00 844.23 a 1125.00 a 1667.80 a 10712.14
1906 1804.20 a 1775.93 a 1485.50 557.50 488.50 99.31 a 59.42 a 112.50 176.90 a 778.32 c 1177.50 b 1242.00 k 8515.57
1907 1928.50 g 1720.44 a 1495.75 a 1160.00 722.00 129.50 43.00 126.50 451.61 b 876.02 b 1117.76 a 1686.40 a 9528.98
1908 1740.65 a 1592.41 a 1565.00 690.00 445.88 a 188.50 26.87 a 0.00 z 270.50 766.00 1149.00 1667.50 10102.31
1909 2131.00 1817.00 1418.25 a 990.00 495.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 888.50 i 2078.79 e 8930.54
1910 1964.37 a 1801.00 955.00 661.00 521.50 122.00 52.00 175.00 394.00 0.00 z 1140.50 1877.50 9663.87
1911 2408.00 1794.00 1402.00 788.50 360.50 52.00 91.50 143.00 384.50 689.50 1659.50 1715.50 11488.50
1912 2523.50 1682.50 1549.00 677.00 437.00 191.00 68.50 115.00 430.00 722.00 1196.00 1807.50 11399.00
1913 2279.53 a 1966.50 1828.00 641.50 539.50 133.00 60.00 43.50 309.00 759.50 1143.00 1387.50 11090.53
1914 1935.00 2131.00 1617.50 838.50 245.50 75.00 18.00 162.00 226.00 490.00 1165.50 2144.50 11048.50
1915 1946.00 1429.00 1403.00 491.00 352.00 208.50 104.00 81.00 316.50 655.00 1201.50 1642.00 9829.50
1916 2274.50 1991.00 1574.00 826.00 423.50 170.50 3.50 84.00 368.50 915.50 1215.50 2173.50 12020.00
1917 2253.50 2146.00 1411.50 825.00 402.50 192.00 29.00 76.00 281.00 971.50 997.50 2369.00 11954.50
1918 2206.00 1736.00 991.00 665.00 425.50 130.00 100.50 58.50 428.50 566.50 1109.00 1612.50 10029.00
1919 1739.00 1775.00 1612.00 655.00 252.00 83.50 0.50 54.00 233.00 968.00 1596.00 2165.00 11133.00
1920 2258.50 1996.00 1440.00 854.00 223.95 b 78.00 25.00 37.00 180.00 415.00 1035.50 1686.50 10229.45
1921 1683.50 1524.00 1616.00 1011.00 345.50 87.50 7.00 80.50 253.97 a 588.00 1441.55 a 1681.00 10319.52
1922 1979.35 a 1764.52 a 1210.50 661.00 205.50 68.00 62.50 46.00 242.50 671.00 998.00 1880.00 9788.87
1923 1984.50 1878.00 1790.50 915.00 386.00 68.50 22.00 129.00 237.93 a 796.70 a 929.00 1428.50 10565.63
1924 2118.00 1464.00 1197.50 859.00 608.50 168.00 82.50 113.50 342.93 a 428.00 1302.00 2105.50 10789.43
1925 2037.50 1591.00 1321.00 549.50 445.00 141.50 83.50 37.00 321.00 911.00 1016.90 a 1576.50 10031.40
1926 1774.00 1277.50 1327.50 657.32 b 302.50 336.00 101.50 128.00 409.50 756.50 1385.00 1800.21 c 10255.54
1927 1857.00 1592.50 1137.50 763.00 491.50 203.00 57.72 b 137.43 a 285.00 675.50 1325.69 a 2199.50 10725.35
1928 1768.50 1456.00 1266.50 973.00 287.00 117.50 72.00 178.50 558.00 755.50 1146.00 1410.00 9988.50
1929 2390.00 1793.50 1224.00 656.50 484.00 167.50 74.50 83.50 426.00 649.50 1356.50 1727.00 11032.50
1930 2119.00 1308.00 1397.00 624.00 451.00 82.76 a 24.00 17.50 328.50 739.00 1157.00 1612.50 9860.26
1931 1614.58 a 1256.50 1451.00 739.50 440.50 92.00 46.50 99.00 205.50 578.00 1066.00 1439.50 9028.58
1932 1780.00 1727.00 1609.50 790.50 375.50 14.50 60.00 36.50 303.00 860.50 1432.50 1857.23 c 10846.73
1933 1875.00 1799.00 1398.00 828.10 a 283.98 c 38.00 25.50 66.50 212.07 a 880.00 1356.50 2053.00 10815.65
1934 1813.00 1687.26 a 1502.00 800.50 298.12 a 137.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 6238.38
1935 0.00 z 0.00 z 0.00 z 0.00 z 280.50 k 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00
1936 2363.50 2282.50 1417.00 988.00 181.50 110.50 5.50 72.33 a 275.50 859.00 1234.50 1654.00 11443.83
1937 2381.50 1747.50 1463.00 807.00 276.50 128.00 23.00 33.00 311.00 739.00 1238.50 1796.50 10944.50
1938 1988.00 1673.50 1025.00 768.50 382.50 111.50 13.50 23.00 194.00 475.00 1357.00 1656.50 9668.00
1939 1857.00 2004.00 1504.50 792.50 264.00 131.00 0.50 56.00 261.00 745.03 a 955.50 1269.00 9840.03
1940 0.00 z 0.00 z 1475.50 853.00 327.50 152.00 18.50 60.00 161.50 476.50 1301.00 1582.50 6408.00
1941 1847.00 1674.50 1456.00 626.50 283.50 119.00 31.50 72.50 342.50 679.50 1170.50 1521.00 9824.00
1942 1574.50 1579.50 1122.00 650.50 476.00 155.50 54.50 68.00 419.50 590.00 1299.00 1916.50 9905.50
1943 2201.50 1592.50 1563.50 715.50 505.00 187.50 3.50 45.50 359.50 566.50 1161.50 1551.50 10453.50
1944 1518.50 1693.00 1564.00 724.00 0.00 z 142.50 36.00 74.50 281.50 613.50 1087.00 1656.00 9390.50
1945 1823.00 1537.00 1025.50 925.00 638.50 221.50 63.50 47.50 409.00 727.00 1346.50 1907.00 10671.00
1946 1938.50 1790.50 1062.50 604.50 474.00 128.50 33.50 98.00 343.50 791.00 1306.00 1857.00 10427.50
1947 1736.50 1729.50 1408.50 825.50 559.50 166.50 49.00 40.50 383.00 482.00 1322.50 1825.00 10528.00
1948 2025.00 1831.00 1626.00 855.00 339.50 129.50 30.00 19.50 140.50 576.50 1141.00 1836.50 10550.00
1949 2005.00 1929.00 1514.00 662.00 378.50 126.00 48.00 45.50 346.00 758.50 1033.50 1871.50 10717.50
1950 2466.50 1832.50 1599.00 1119.00 397.50 f 177.00 77.50 147.00 268.00 0.00 z 1365.52 a 1950.93 a 11002.95
1951 2110.14 b 1643.50 1582.00 858.10 a 290.00 157.24 a 45.47 a 90.93 a 373.00 678.50 1374.50 1831.00 11034.38
1952 1988.00 1366.22 b 1342.50 475.50 294.50 47.00 28.50 47.00 168.10 a 700.50 1081.07 b 1450.50 8989.40
1953 1793.50 1495.41 a 1249.00 799.50 368.50 113.79 a 33.00 23.00 245.00 382.50 921.50 1550.00 8974.70
1954 1685.00 h 1159.00 1319.50 806.50 469.50 112.50 24.50 10.00 264.50 570.52 e 930.52 a 1433.50 7100.54
1955 1973.15 a 1790.88 c 1738.00 483.00 234.00 77.00 3.32 c 20.31 b 289.66 a 596.75 c 1409.00 1955.00 10570.07
1956 1941.00 1852.98 e 1525.41 b 982.00 412.09 b 28.33 c 12.50 i 43.50 390.00 489.80 a 1037.07 a 1643.55 c 10345.74
1957 2040.32 a 1658.09 e 1297.87 a 750.50 189.50 g 188.50 6.20 a 41.85 a 297.00 574.00 1150.50 1474.57 a 9479.39
1958 1555.68 a 1536.00 1108.00 650.69 a 347.00 216.11 c 52.00 87.00 231.00 383.50 i 1174.14 a 1946.80 a 8904.42
1959 2127.50 0.00 z 1328.50 702.00 399.00 77.00 20.00 9.00 255.00 850.00 1437.50 1345.50 8551.00
1960 1870.00 1593.45 a 1540.70 a 769.14 a 318.00 115.00 40.50 20.00 173.28 a 548.50 1129.50 1810.50 9928.56
1961 1952.45 c 1437.50 1117.00 854.48 a 337.00 49.00 27.00 8.00 316.00 567.82 a 1108.97 a 1912.00 9687.21
1962 2050.50 1838.00 1450.00 943.00 236.00 l 68.00 23.00 37.00 305.17 a 539.00 1060.50 1627.00 9941.17
1963 2076.50 1628.50 1143.50 668.50 388.00 45.00 12.00 30.50 172.50 315.50 1027.00 1900.50 9408.00
1964 1738.50 1539.50 1551.00 666.00 251.50 162.50 5.00 123.50 330.50 603.50 1119.00 0.00 z 8090.50
1965 2165.50 1707.00 1650.50 762.00 0.00 z 81.00 31.00 75.50 0.00 z 0.00 z 0.00 z 0.00 z 6472.50
1966 2451.67 b 0.00 z 0.00 z 0.00 z 0.00 z 141.00 e 2.50 70.50 243.50 719.00 1393.00 1854.46 c 6875.64
1967 1930.78 a 1952.22 a 1448.50 924.44 c 563.00 114.23 d 43.73 c 99.09 c 197.14 b 570.00 f 1165.56 c 1682.86 c 10121.56
1968 1654.50 g 1795.00 1203.04 e 484.00 i 448.47 a 70.00 j 56.50 j 141.29 e 238.80 e 652.72 d 1068.89 c 1767.57 d 7315.78
1969 2187.50 1620.37 a 1609.79 c 672.00 376.65 a 240.50 h 51.87 e 20.00 257.59 a 830.00 882.00 h 1529.69 b 9155.45
1970 0.00 z 1662.77 b 0.00 z 677.00 f 511.50 d 30.00 i 0.00 z 33.00 j 325.20 e 668.10 b 1242.41 a 1819.24 d 6229.23
1971 2299.88 b 1533.28 c 1356.00 783.33 c 350.50 f 38.79 a 71.50 f 50.38 c 257.59 a 626.00 1191.60 e 1366.50 h 8136.85
1972 2189.08 e 1883.45 a 1459.98 e 786.96 b 164.00 l 101.67 c 85.00 64.50 395.50 814.00 1312.50 1976.00 11068.63
1973 1748.50 1559.00 975.50 804.31 a 394.00 135.00 44.00 13.50 340.00 c 521.50 1314.50 1824.50 9674.31
1974 2191.00 1774.00 1610.00 900.50 515.50 104.50 12.50 122.50 418.00 674.50 1149.50 1482.50 10955.00
1975 1839.69 b 1731.50 1608.50 911.00 348.00 148.00 24.00 92.50 350.50 602.50 1074.00 1787.00 10517.19
1976 1992.00 1455.50 1473.65 d 632.00 375.00 91.00 40.00 54.52 b 0.00 z 0.00 z 1241.00 1962.50 9317.17
1977 2185.50 1471.17 d 1177.50 588.10 a 111.00 100.00 48.50 216.50 311.00 611.50 1238.50 1898.23 a 9957.50
1978 2203.77 c 1802.00 1429.50 765.50 257.00 175.56 c 48.22 d 148.11 d 279.00 697.50 a 1399.50 1979.00 11184.66
1979 2325.50 2046.00 1573.00 1044.50 579.50 141.00 27.00 142.60 a 298.50 770.00 1248.00 1518.50 11714.10
1980 2002.00 1748.50 1532.00 566.50 248.50 123.00 32.60 b 127.88 c 381.50 765.00 1025.50 1783.50 10336.48
1981 1744.50 1395.50 1076.00 709.00 396.80 a 139.14 a 41.85 a 20.48 c 331.50 742.50 937.50 1731.00 9265.77
1982 2398.00 1693.50 1405.50 868.50 307.50 293.00 37.00 142.00 352.50 705.50 1317.50 1543.00 11063.50
1983 1659.00 1414.00 1274.50 813.00 544.50 148.50 37.00 15.50 364.00 749.50 1125.00 2162.00 10306.50
1984 1887.50 1331.00 1459.50 638.00 474.00 105.00 47.50 45.00 471.50 726.00 1309.50 1998.00 10492.50
1985 2050.50 1805.50 1130.50 630.50 260.50 250.50 57.00 159.50 434.50 761.50 1603.50 2036.00 11180.00
1986 1738.50 1669.50 1214.00 723.50 295.50 109.50 25.50 128.50 381.50 739.50 1499.00 1602.50 10127.00
1987 1720.00 1273.50 1335.00 537.00 254.72 a 99.50 41.00 109.00 260.00 838.50 1044.50 1473.50 8986.22
1988 2028.50 1780.00 1272.50 754.50 261.50 32.50 13.50 61.00 374.50 852.00 1231.00 1722.50 10384.00
1989 1855.50 1815.69 b 1642.00 930.00 286.50 139.00 3.00 97.50 322.50 713.50 1381.50 2007.50 11194.19
1990 1599.00 1608.50 1216.00 776.00 434.50 105.50 54.50 65.00 272.50 748.00 1187.50 1867.50 9934.50
1991 2030.50 1376.50 1257.00 587.50 295.50 38.00 29.00 30.00 357.50 927.00 1443.50 1636.50 10008.50
1992 1685.00 1490.00 1244.00 898.00 321.00 190.00 185.00 158.00 417.50 754.50 1235.50 1875.50 10454.00
1993 2002.50 1683.00 1331.50 752.50 386.50 213.00 99.00 88.00 443.50 842.00 1284.00 1677.50 10803.00
1994 2304.50 1836.00 1162.00 768.00 324.00 75.00 63.00 127.00 248.50 578.50 1097.00 1586.50 10170.00
1995 1885.50 1638.50 1305.50 919.50 432.50 71.50 43.50 30.00 325.50 745.00 1480.50 1864.50 10742.00
1996 2244.50 1734.00 1653.50 1040.00 424.50 107.00 39.00 33.00 298.00 716.00 1574.50 1953.00 11817.00
1997 2105.50 1593.00 1543.50 1010.00 490.00 36.00 52.50 80.00 210.50 707.00 1226.50 1274.00 10328.50
1998 1808.50 1141.50 1303.50 541.00 220.50 167.00 39.00 10.50 191.50 651.00 1153.00 1619.50 8846.50
1999 2015.50 1312.50 1152.50 646.50 316.00 123.00 41.69 b 64.00 347.59 a 775.50 930.50 1444.50 9169.78
2000 1913.00 1353.50 985.50 749.50 316.00 166.55 a 42.50 39.50 341.50 629.50 1210.00 2136.50 9883.55
2001 1714.50 1817.00 1325.50 730.50 281.00 137.50 39.00 i 39.55 b 274.66 a 758.00 889.00 1520.50 9487.71
2002 1681.50 1328.50 1609.50 843.50 573.00 72.50 7.00 62.00 253.50 984.50 1233.50 1489.50 10138.50
2003 1831.50 1796.00 1419.50 672.00 306.50 100.00 23.50 40.00 304.50 614.50 1368.50 1470.50 9947.00
2004 2131.50 1585.50 1315.50 780.50 570.00 212.00 72.50 276.70 d 225.00 708.00 984.50 1730.50 10592.20
2005 2088.50 1553.50 1447.50 589.00 480.00 75.00 53.50 67.00 219.00 636.50 1073.50 1520.50 9803.50
2006 1419.50 1697.50 1388.00 546.00 360.00 52.00 13.50 33.50 315.00 790.50 1172.50 1520.50 9308.50
2007 1853.00 0.00 z 1309.50 775.00 336.50 81.50 19.50 93.50 305.00 629.00 1158.50 1858.50 8419.50
2008 1954.00 1901.00 1488.50 837.50 513.50 144.00 34.50 46.50 0.00 z 653.00 1145.00 2020.54 c 10738.04
2009 2153.50 1654.50 1486.50 824.50 537.50 180.00 70.00 94.50 98.00 830.50 915.00 1858.50 10703.00
2010 1830.00 1677.00 1100.50 512.00 341.00 115.00 6.50 56.00 367.50 543.00 1158.00 1793.50 9500.00
2011 2033.27 c 1641.00 1479.00 780.50 423.50 129.50 21.38 b 24.28 a 273.00 601.92 a 1080.50 1448.22 a 9936.06
2012 1599.08 a 1439.50 921.73 a 642.41 a 330.67 a 87.00 8.00 58.26 b 336.00 780.50 1258.50 1739.10 a 9200.76
2013 1888.42 a 1630.22 a 1660.50 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 5179.14
Period of Record Statistics
MEAN 1976.92 1673.94 1387.30 761.10 382.80 126.50 41.73 77.61 310.27 691.14 1203.13 1750.40 10366.72
S.D. 232.58 216.21 196.34 141.67 109.70 56.77 29.13 49.71 83.17 129.79 165.84 221.48 728.39
SKEW 0.14 -0.03 -0.34 0.22 0.40 0.67 1.37 0.97 0.08 -0.19 0.32 0.15 0.00
MAX 2523.50 2282.50 1828.00 1160.00 722.00 336.00 185.00 276.70 558.00 984.50 1659.50 2369.00 12020.00
MIN 1419.50 1141.50 921.73 475.50 111.00 14.50 0.50 8.00 98.00 315.50 889.00 1269.00 8846.50
NO YRS 108 108 110 110 106 109 107 110 109 105 109 108 83