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 201303
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
1893 1386.00 j 1795.50 1502.98 a 987.78 c 444.00 32.14 b 19.93 c 100.75 a 323.00 708.50 1223.28 a 1904.50 9042.36
1894 1908.00 1586.50 1184.00 657.41 a 353.40 a 35.56 c 7.75 a 37.20 a 249.81 d 700.08 a 1323.50 1352.52 d 9395.73
1895 2052.00 1677.50 1385.50 531.50 346.00 84.00 l 72.50 110.00 283.50 829.00 1238.50 1590.00 10116.00
1896 1790.50 1522.50 1486.00 784.44 c 229.00 k 79.82 b 42.00 129.17 a 388.97 a 776.50 1575.52 a 1532.50 10107.92
1897 1973.67 a 1524.00 1477.50 718.00 416.50 267.00 21.50 143.00 171.50 570.50 1292.50 1812.50 10388.17
1898 1579.00 1494.37 a 1199.50 766.50 420.50 126.00 66.50 119.00 311.00 804.50 1270.50 1756.84 b 9914.21
1899 1899.27 a 1849.00 1727.50 807.00 446.50 121.50 27.50 64.00 392.00 627.50 873.33 c 1607.87 a 10442.97
1900 1586.50 1767.50 1414.38 c 538.00 277.00 103.00 70.00 12.00 309.00 376.50 1290.00 1545.00 9288.88
1901 1795.00 1674.50 1296.50 674.50 298.50 137.00 31.50 52.00 363.33 c 590.00 1178.00 1695.00 9785.83
1902 1668.50 1438.00 1049.00 837.50 345.00 182.00 26.50 91.50 422.07 a 657.00 1056.50 1704.00 9477.57
1903 1843.50 1683.00 1262.00 765.50 340.00 156.00 65.50 166.00 430.34 a 673.73 a 1287.93 a 1882.22 a 10555.73
1904 2026.00 2027.41 a 1493.68 a 959.00 409.00 170.50 67.50 0.00 z 0.00 z 650.48 a 914.00 1645.00 10362.58
1905 2019.00 1738.50 1141.50 832.00 504.50 162.00 54.50 38.50 226.00 737.59 b 1074.50 1561.00 10089.59
1906 1684.50 1721.50 1563.00 630.00 451.00 117.00 37.00 85.50 153.00 652.50 1078.33 c 1706.50 9879.83
1907 2097.00 1552.00 1303.00 1050.00 b 684.50 128.50 12.50 86.00 355.00 587.50 f 1068.00 1478.50 9815.00
1908 1642.00 1466.00 1328.50 650.50 428.50 147.50 48.00 84.22 a 173.50 650.50 1030.34 a 1633.00 9282.56
1909 1894.50 1592.00 1318.00 1017.22 c 422.00 93.50 10.50 25.00 256.50 728.00 1080.00 1795.00 10232.22
1910 1716.00 1765.00 819.00 567.00 445.50 118.00 14.50 109.00 286.50 458.91 c 1282.50 1736.00 9317.91
1911 2046.50 1477.50 1125.50 748.00 331.24 d 40.50 87.00 139.00 340.50 720.50 1473.00 1513.00 10042.24
1912 2358.98 e 1671.50 1564.00 643.50 326.00 167.00 49.00 119.00 339.50 645.00 1025.00 1546.50 10454.98
1913 2017.50 1734.00 1570.00 612.00 492.50 81.50 57.00 38.50 305.00 771.50 970.50 1297.00 9947.00
1914 1638.00 1923.00 1326.50 839.50 319.50 111.50 14.50 114.00 238.45 a 470.50 1064.00 1845.00 9904.45
1915 1963.85 a 1286.00 1266.50 445.00 473.00 221.50 90.00 104.88 a 295.00 611.00 1105.00 1529.00 9390.73
1916 2133.50 1813.50 1460.00 820.00 449.00 167.50 0.00 95.50 351.50 798.25 c 1120.50 1897.00 11106.25
1917 2093.50 1915.00 1348.00 809.50 439.17 a 194.00 30.47 b 64.50 l 281.00 997.00 928.00 1985.00 11020.63
1918 2081.50 1595.00 999.50 779.00 416.50 110.00 53.50 32.00 455.00 621.50 985.00 1411.00 9539.50
1919 1545.50 1535.00 1340.50 728.50 353.50 83.00 2.50 73.50 225.50 905.50 1370.00 1888.00 10051.00
1920 1995.50 1629.00 1256.50 970.00 354.50 125.50 37.50 65.00 169.50 439.50 1128.00 1497.82 a 9668.32
1921 1569.50 1293.50 1188.85 a 0.00 z 0.00 z 0.00 z 9.30 a 69.50 231.50 609.00 969.50 f 1657.95 c 6629.10
1922 1852.77 a 1750.52 a 1220.50 762.93 a 199.12 e 62.07 a 74.00 47.02 a 221.00 549.00 948.50 1757.00 9444.42
1923 1767.52 a 1747.93 a 1581.50 852.00 351.00 57.00 6.41 b 118.50 229.00 665.47 a 944.00 1344.50 9664.82
1924 2064.08 a 1427.50 1206.50 823.00 613.11 d 161.00 52.00 85.00 348.00 441.00 1155.50 781.50 p 8376.70
1925 1440.50 h 1499.50 1205.50 553.50 462.00 159.00 66.50 47.50 244.50 1026.00 1159.82 b 1704.48 a 8128.30
1926 1722.00 1400.00 1403.50 839.50 272.50 235.00 50.50 83.00 422.00 787.00 1414.44 c 1846.50 10475.94
1927 1859.50 1525.50 1195.00 787.50 540.50 173.50 67.50 125.00 271.50 582.00 1291.00 1963.91 d 10382.41
1928 1730.50 1533.10 c 1263.50 929.00 271.00 177.50 20.00 84.50 396.50 640.50 1007.22 c 1413.50 9466.82
1929 2227.00 1737.00 1149.58 a 730.00 522.50 130.50 20.00 48.00 401.67 c 629.00 1264.00 1726.50 10585.75
1930 2188.08 a 1325.00 1295.00 711.00 401.00 91.00 46.50 23.50 313.00 737.50 1110.00 1531.00 9772.58
1931 1556.00 1188.50 1224.50 650.00 417.00 64.00 29.00 104.50 172.00 482.50 973.50 1350.00 8211.50
1932 1646.00 1581.00 1515.50 720.00 a 342.00 11.50 49.50 41.00 300.50 787.00 1265.50 1753.50 10013.00
1933 1630.00 1709.50 1243.00 751.00 322.00 27.50 7.00 56.00 173.04 b 756.50 1272.50 1797.50 9745.54
1934 1613.50 1520.00 1348.00 780.00 193.00 80.50 24.00 126.50 396.50 512.00 941.00 1717.50 9252.50
1935 1964.50 1223.50 1179.50 844.66 a 453.12 a 190.00 2.00 97.50 292.50 642.50 1377.50 1667.00 9934.27
1936 2116.00 2070.81 b 1255.00 949.66 a 257.00 145.00 14.50 65.50 207.00 788.50 1258.50 1583.00 10710.47
1937 2186.00 1597.50 1425.50 864.00 317.50 126.50 27.50 12.50 261.00 746.50 1186.50 1734.00 10485.00
1938 1849.00 1433.50 980.00 797.00 502.00 149.00 23.00 22.00 253.50 511.00 1279.50 1627.50 9427.00
1939 1726.50 1841.00 1427.00 930.00 291.00 158.50 25.00 72.50 311.00 745.50 994.00 1334.00 9856.00
1940 1980.00 1425.50 1408.00 825.00 411.50 137.00 31.50 113.00 195.00 494.00 1274.00 1596.50 9891.00
1941 1732.00 1611.00 1384.00 574.50 236.50 128.50 33.50 70.50 284.50 631.50 1053.50 1444.00 9184.00
1942 1612.00 a 1466.50 1062.00 581.50 475.00 170.89 b 65.00 72.00 402.50 645.00 1203.00 1806.00 9561.39
1943 2112.50 1603.00 1639.50 788.00 503.50 142.50 13.50 44.00 380.00 622.00 1191.50 1546.50 10586.50
1944 1462.00 1643.00 1448.50 848.50 352.00 119.50 37.00 82.00 306.00 640.50 970.00 1674.00 9583.00
1945 1837.27 a 1602.00 1092.50 884.00 583.50 262.50 73.00 53.00 385.50 708.50 1228.00 1782.50 10492.27
1946 1819.50 1723.04 a 989.50 630.50 467.00 141.50 20.00 95.00 315.00 695.50 1164.00 1733.00 9793.54
1947 1739.50 1669.00 1405.00 871.50 562.50 191.00 39.50 20.00 314.50 383.50 1323.00 1684.50 10203.50
1948 2001.50 1786.50 1422.00 724.50 370.50 119.50 30.50 31.50 155.00 594.50 1094.00 1728.50 10058.50
1949 1849.00 0.00 z 1447.00 662.00 348.00 83.00 26.50 37.50 331.00 613.50 998.50 1669.00 8065.00
1950 2199.00 1562.50 1439.84 c 1053.00 521.32 a 146.50 38.00 124.50 208.50 608.00 1272.50 1851.50 11025.16
1951 1956.50 1522.50 1535.00 851.50 255.00 188.50 57.50 96.00 401.00 689.00 1384.50 1770.00 10707.00
1952 1948.00 1327.27 a 1426.50 632.00 345.00 83.00 33.50 64.50 262.50 792.00 1060.71 b 1439.50 9414.48
1953 1737.00 1499.50 1235.50 842.50 392.00 115.00 46.50 19.50 303.00 440.50 951.50 1621.50 9204.00
1954 2059.50 1218.50 1398.50 835.00 550.00 106.50 31.50 37.50 317.00 689.50 987.50 1432.50 9663.50
1955 1837.00 1671.00 1601.50 540.00 267.50 102.00 11.88 a 17.00 296.50 583.66 b 1402.00 1880.00 10210.04
1956 1796.00 1721.88 a 1500.00 930.00 446.50 56.50 59.00 65.00 381.72 a 429.50 1037.50 1543.50 9967.10
1957 2033.50 1538.00 1307.50 725.50 337.38 a 115.00 2.00 56.00 331.50 639.12 a 1091.50 1435.50 9612.50
1958 1507.00 1507.00 1112.00 645.00 299.50 226.50 61.50 70.50 244.00 545.00 1108.97 a 1791.00 9117.97
1959 1996.92 a 1573.00 1148.00 696.50 326.50 75.50 33.00 25.50 264.00 784.50 1392.50 1315.50 9631.42
1960 1773.00 1535.00 1514.00 737.00 325.00 122.50 35.00 20.00 267.00 573.00 1058.00 1674.50 9634.00
1961 1821.00 1258.00 976.50 895.50 407.50 59.50 16.50 14.50 313.50 580.00 1089.50 1665.00 9097.00
1962 1934.00 1564.00 1208.50 800.50 298.00 89.50 44.00 38.50 312.50 497.50 929.00 1576.50 9292.50
1963 2035.00 1586.00 1062.00 614.00 395.00 63.00 3.50 45.00 147.00 285.00 941.50 1802.50 8979.50
1964 1590.00 1452.50 1398.50 666.50 240.00 104.00 5.50 126.50 327.50 628.50 1068.00 1818.00 9425.50
1965 1932.50 1629.50 1573.00 749.00 317.00 84.00 29.00 64.00 486.50 540.00 1135.00 1370.72 a 9910.22
1966 2135.50 1539.00 1080.00 869.50 463.50 98.50 3.50 93.50 251.00 620.00 1218.00 1596.00 9968.00
1967 1746.00 1713.50 1231.00 755.50 524.50 112.00 52.00 70.50 191.50 675.00 1112.50 1575.00 9759.00
1968 1783.50 1620.50 988.00 662.00 417.00 98.00 53.50 70.00 234.50 552.00 1049.00 1695.00 9223.00
1969 1933.00 1397.50 1358.00 613.00 347.20 a 242.00 37.00 17.00 226.00 754.00 1064.00 1504.00 9492.70
1970 1929.50 1526.00 1413.00 795.00 418.50 66.50 16.00 30.50 257.00 610.50 1160.50 1745.00 9968.00
1971 2048.50 1445.50 1273.00 677.00 398.00 37.50 76.50 67.00 287.50 570.00 1159.50 1669.00 9709.00
1972 2080.00 1775.50 1356.50 834.50 246.00 100.50 58.00 88.00 331.50 752.00 1156.50 1869.50 10648.50
1973 1653.50 1397.50 906.00 715.00 375.00 109.00 41.50 22.00 323.00 469.50 1133.50 1659.50 8805.00
1974 1906.50 1427.50 1322.00 709.00 458.00 102.50 11.00 104.00 395.00 572.00 1062.00 1383.00 9452.50
1975 1691.50 1504.00 1390.00 907.00 278.50 123.00 28.00 60.00 353.00 548.50 1045.50 1633.00 9562.00
1976 1858.00 1293.50 1280.50 541.50 330.50 63.50 21.00 41.00 239.00 790.00 1294.50 1885.50 9638.50
1977 2121.50 1346.50 1006.50 495.00 84.00 65.50 14.50 160.00 292.00 657.50 1212.00 1797.00 9252.00
1978 2010.50 1637.50 1233.00 720.00 243.50 116.00 31.50 51.50 224.00 586.50 1226.50 1804.00 9884.50
1979 2139.00 1748.50 1304.00 888.00 541.00 135.50 26.00 87.50 196.50 709.50 1150.50 1385.50 10311.50
1980 1824.00 1589.50 1387.00 574.00 243.00 104.50 16.50 54.00 320.50 742.00 1026.00 1659.50 9540.50
1981 1664.00 1297.00 1005.50 635.00 354.00 116.50 33.00 30.00 300.00 700.50 917.50 1670.00 8723.00
1982 2207.50 1559.50 1342.50 819.50 282.00 253.50 21.00 102.00 338.00 663.50 1282.00 1430.00 10301.00
1983 1669.87 a 1268.00 1111.50 737.50 431.00 106.50 13.50 10.00 282.50 677.50 1112.00 2107.50 9527.37
1984 1845.50 1208.50 1390.00 650.00 427.50 94.00 36.00 35.00 426.00 604.50 a 1109.00 1704.50 9530.50
1985 1874.00 1592.00 1070.00 602.50 224.00 222.50 33.50 114.00 345.50 675.00 1433.00 1994.00 10180.00
1986 1623.00 1511.00 0.00 z 593.50 300.00 76.00 4.50 96.00 293.50 601.50 1282.00 1444.50 7825.50
1987 1574.00 1103.50 1009.50 436.00 218.00 55.50 16.00 82.00 198.00 739.00 966.50 1450.80 a 7848.80
1988 1971.00 1744.00 1196.00 646.00 133.00 23.50 8.50 49.50 243.50 763.00 1157.50 1667.80 a 9603.30
1989 1682.00 1820.00 1372.00 768.50 312.00 129.00 0.00 35.00 254.50 621.00 1309.00 1941.00 10244.00
1990 1458.00 1423.00 1091.50 713.50 369.00 77.00 24.00 34.50 214.50 679.00 1014.00 1695.00 8793.00
1991 1903.00 1303.50 1112.00 583.00 233.00 20.00 17.00 21.50 288.50 730.00 1310.00 1558.50 9080.00
1992 1513.50 1239.00 1065.50 741.50 266.00 155.50 115.50 128.50 263.50 687.50 1189.50 1665.00 9030.50
1993 1832.00 1529.50 1224.50 726.50 352.50 166.00 40.00 61.00 402.50 715.00 1272.00 1589.50 9911.00
1994 2156.00 1671.50 1127.00 692.50 282.00 64.50 24.50 69.50 179.50 519.50 992.00 1427.00 9205.50
1995 1698.50 1539.00 1133.50 873.00 348.50 55.50 24.50 8.00 293.00 669.50 1357.50 1691.50 9692.00
1996 2079.50 1597.00 1527.00 892.50 403.00 75.50 24.50 17.50 278.50 630.50 1389.50 1825.00 10740.00
1997 1941.00 1441.00 1306.00 805.50 462.00 26.00 48.50 73.50 170.00 589.50 1258.00 1324.50 9445.50
1998 1639.50 1022.00 1154.50 558.50 174.00 137.50 18.50 6.50 135.00 558.00 1048.00 1495.50 7947.50
1999 1852.25 a 1272.50 1147.52 a 653.50 313.00 116.50 24.00 50.50 340.00 705.00 912.00 1427.03 a 8813.80
2000 1750.50 1296.00 1003.88 a 712.00 337.38 a 191.25 b 43.00 43.00 319.50 596.50 1148.28 a 2038.00 9479.29
2001 1567.50 1748.50 1318.53 a 695.00 312.50 113.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 5755.53
2002 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
2003 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
2004 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
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 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
2007 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
2008 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
2009 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
2010 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
2011 1935.50 1539.00 1337.50 511.50 k 395.52 b 133.39 b 9.00 24.50 309.31 a 529.00 1044.00 1367.62 a 8624.34
2012 1532.50 1328.50 800.00 627.32 b 290.50 60.50 0.00 63.50 302.00 731.00 1076.90 a 1594.50 8407.22
2013 1752.50 1504.22 a 1473.53 a 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 4730.26
Period of Record Statistics
MEAN 1856.38 1550.22 1280.17 742.81 370.06 118.86 33.41 67.03 291.50 643.47 1148.71 1646.59 9709.67
S.D. 200.09 191.85 184.89 129.24 104.09 55.09 22.68 37.48 74.97 119.45 146.53 178.76 610.32
SKEW 0.04 -0.09 -0.18 0.06 0.17 0.50 0.82 0.41 0.10 0.05 0.34 0.05 -0.37
MAX 2358.98 2070.81 1727.50 1053.00 684.50 267.00 115.50 166.00 486.50 1026.00 1575.52 2107.50 11106.25
MIN 1458.00 1022.00 800.00 436.00 84.00 11.50 0.00 6.50 135.00 285.00 873.33 1297.00 7848.80
NO YRS 110 111 111 109 109 109 110 108 109 109 109 109 98