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
1893 2087.69 b 0.00 z 0.00 z 1018.27 d 424.50 47.07 a 46.50 83.50 g 322.24 a 795.48 c 1302.50 1966.50 8010.75
1894 2012.00 1545.50 1205.50 607.00 369.50 53.28 a 28.93 a 51.00 311.25 b 660.82 a 1235.50 1388.00 9468.28
1895 2062.00 1670.00 1297.50 473.50 301.50 208.85 d 84.00 117.00 305.36 b 762.00 1280.00 1617.17 a 10178.87
1896 1898.50 1505.00 1520.00 740.50 247.50 57.00 37.50 98.00 353.00 747.00 1636.00 1562.50 10402.50
1897 1981.00 1666.00 1579.00 709.50 366.00 134.00 n 0.00 z 0.00 z 0.00 z 577.63 a 1296.50 1252.50 i 8175.63
1898 1632.84 b 1504.50 1276.50 659.00 391.50 175.80 e 63.50 90.50 258.00 782.00 1195.18 b 1078.50 k 8029.32
1899 1922.50 1711.00 1590.19 d 566.50 0.00 z 0.00 z 30.50 67.50 313.00 643.00 836.38 a 1618.50 9299.06
1900 1601.67 a 1799.50 1384.00 440.00 252.81 b 105.50 28.00 10.00 333.00 391.00 f 1292.50 1512.50 8759.48
1901 1815.50 1628.00 1271.50 594.00 246.00 149.50 15.50 79.00 359.42 d 553.02 c 1189.50 1700.50 9601.44
1902 1592.50 1421.00 1056.00 741.50 276.50 174.00 10.50 107.00 386.00 689.00 1152.50 1354.00 g 7606.50
1903 1745.41 c 1660.50 1323.50 638.00 309.00 133.00 39.00 h 127.50 414.31 a 594.50 1258.00 1724.00 9927.72
1904 1800.00 1882.00 1389.50 819.00 334.80 a 135.00 72.00 132.50 313.50 551.80 a 858.00 1250.50 f 8288.10
1905 1934.00 1533.00 1036.90 b 715.50 419.00 175.50 50.00 22.45 b 173.65 d 738.00 1036.50 1576.87 a 9411.37
1906 1691.05 a 1640.00 1408.00 503.00 418.00 88.50 54.50 83.50 145.00 644.00 1116.00 1873.00 9664.55
1907 2249.00 1608.00 1394.00 979.00 647.50 125.00 18.50 82.00 360.54 b 677.50 1073.50 1419.00 10633.54
1908 1585.00 1529.50 1503.00 635.50 422.63 a 102.00 30.50 87.83 a 190.50 655.43 c 1029.50 1628.50 9399.90
1909 1904.50 1617.50 1294.00 900.00 358.50 66.50 14.00 37.20 a 230.00 679.00 1162.24 a 1890.50 10153.94
1910 1747.37 a 1699.19 a 570.50 f 553.45 a 465.52 a 123.10 a 11.00 77.50 295.50 530.62 a 1293.00 1754.60 a 8550.84
1911 2146.50 1670.50 1140.50 638.00 267.00 35.50 71.00 103.50 332.50 684.50 1454.50 1625.50 10169.50
1912 2301.50 1594.00 1469.50 604.00 283.00 139.00 54.50 99.00 379.50 626.00 1004.00 1504.00 10058.00
1913 2063.50 1683.50 1526.50 526.00 456.00 85.50 41.50 6.50 246.50 822.00 972.00 1370.50 9800.00
1914 1687.50 1970.00 1238.00 793.50 297.00 102.50 10.00 132.50 193.50 438.00 1099.00 1912.50 9874.00
1915 1954.50 1376.00 1250.00 472.00 411.00 246.50 98.50 95.50 316.50 599.50 1152.50 1595.00 9567.50
1916 2198.00 1837.50 1495.00 785.00 430.00 0.00 z 4.00 93.50 325.00 820.00 1108.50 1998.00 11094.50
1917 2168.00 1949.00 1344.50 824.00 424.00 199.50 44.50 92.00 283.50 0.00 z 935.50 2044.50 10309.00
1918 0.00 z 1584.00 920.00 697.50 425.00 130.50 67.50 33.00 429.00 601.00 1047.00 1605.50 7540.00
1919 1639.00 1663.50 1424.00 668.50 314.50 79.50 9.50 60.00 226.50 998.50 1587.00 1930.00 10600.50
1920 2120.50 1682.50 1376.00 977.50 321.00 101.00 28.93 a 40.50 172.50 501.50 1120.50 1569.50 10011.93
1921 1644.00 1392.50 1369.50 680.50 322.50 72.50 2.50 53.00 229.00 564.50 1382.50 1620.50 9333.50
1922 1882.50 1787.85 a 1193.00 689.00 232.00 76.00 65.00 44.00 214.50 583.50 950.50 1824.50 9542.35
1923 1808.00 1705.00 1577.00 797.00 330.50 57.50 11.00 101.50 197.50 638.08 a 881.00 1399.00 9503.08
1924 2076.00 1446.00 1183.00 785.00 599.00 153.00 75.50 101.00 333.00 442.50 1188.50 1983.00 10365.50
1925 1850.00 1478.50 1249.50 508.00 433.50 127.00 77.00 29.00 242.00 959.00 1157.50 1660.00 9771.00
1926 1629.50 1306.00 1314.00 716.00 229.00 189.00 36.50 62.50 377.50 729.50 1338.50 1800.00 9728.00
1927 1774.75 a 1485.04 a 1060.00 697.00 486.00 143.50 41.50 101.00 290.50 579.50 1317.50 1973.67 a 9949.95
1928 1650.00 1369.50 1250.00 866.00 264.50 185.00 13.50 84.50 326.00 674.50 1019.50 1377.00 9080.00
1929 2235.50 1775.00 1117.50 690.50 516.50 132.00 29.00 32.00 376.00 585.00 1262.50 1722.50 10474.00
1930 2091.00 1313.00 1273.50 591.00 409.50 66.00 11.50 15.00 284.00 729.50 1089.00 1496.00 9369.00
1931 1512.50 1134.50 1208.00 643.00 409.50 68.00 18.50 64.50 171.00 503.00 1006.50 1407.00 8146.00
1932 1721.03 b 1596.50 1488.50 694.00 296.50 5.00 40.50 23.77 a 223.50 764.50 1256.00 1684.50 9794.30
1933 1723.50 1662.50 1198.50 752.00 272.80 a 22.50 5.50 27.50 139.00 792.50 1268.50 1907.00 9771.80
1934 1685.50 1468.96 a 1362.45 a 715.50 194.50 73.50 24.50 101.00 400.34 a 531.50 988.50 1734.50 9280.76
1935 2077.00 a 1213.00 1222.95 a 798.50 422.50 150.00 2.07 a 104.50 295.86 a 700.50 1513.00 1711.72 a 10211.60
1936 2328.50 2264.50 1360.00 935.69 a 196.33 a 114.50 3.62 a 41.85 a 211.50 806.00 1219.00 1637.00 11118.49
1937 2315.00 1733.00 1390.50 760.50 278.00 109.00 26.00 21.50 300.50 715.50 1250.00 1759.00 10658.50
1938 1900.50 1630.00 967.72 a 712.50 414.00 111.21 a 8.50 24.00 171.50 472.50 1312.50 1602.50 9327.42
1939 1781.50 1930.50 1420.00 761.00 207.00 119.50 5.50 38.23 a 272.50 764.15 a 949.00 1291.00 9539.88
1940 1920.50 1505.50 1501.50 809.00 352.00 120.50 13.50 86.00 182.50 477.50 1278.50 1522.50 9769.50
1941 1793.50 1663.00 1399.50 614.00 250.00 101.50 24.00 51.00 284.50 612.50 1084.00 1441.50 9319.00
1942 1500.50 1520.00 1031.50 567.00 395.50 106.55 a 34.50 47.00 383.00 561.00 1177.00 1836.50 9160.05
1943 2118.50 1542.00 1503.00 650.50 481.50 157.00 1.50 28.00 303.00 551.00 1127.50 1457.50 9921.00
1944 1458.55 a 1584.00 1466.82 a 706.50 240.77 a 97.76 a 19.00 60.45 a 250.86 a 548.50 1029.50 1587.00 9049.70
1945 1741.00 1451.00 949.50 814.50 547.00 148.00 44.00 36.17 a 386.00 665.50 1236.72 a 1875.50 9894.89
1946 1838.00 1707.00 967.00 544.50 430.50 105.00 a 12.00 58.00 302.00 680.00 1209.50 1731.50 9585.00
1947 1622.50 1619.33 a 1303.50 758.50 470.50 132.00 22.00 36.00 343.50 417.00 1321.50 1737.00 9783.33
1948 1959.20 a 1798.50 1559.50 744.50 318.50 100.50 18.08 a 16.50 137.00 558.50 1095.52 a 1773.72 a 10080.02
1949 1972.50 1843.00 1426.00 b 604.14 a 318.27 a 92.00 24.80 a 40.50 301.50 660.00 950.69 a 1780.50 10013.89
1950 2366.50 1717.00 1462.00 1040.50 478.00 108.00 41.00 107.50 227.00 565.23 a 1291.50 1824.35 a 11228.58
1951 1987.00 1505.26 a 1477.50 761.00 215.00 165.00 a 31.00 67.50 316.07 b 704.50 1364.48 a 1834.50 10428.81
1952 2038.25 a 1369.00 1314.50 498.50 318.50 61.00 f 13.50 52.50 187.00 709.50 1009.50 1433.50 8944.25
1953 1715.33 a 1371.00 1155.27 a 782.50 328.08 a 101.00 24.00 10.50 240.00 362.50 912.00 1572.98 b 8575.17
1954 2113.50 1081.00 1229.50 731.50 445.50 97.50 23.00 48.00 260.50 627.50 928.45 a 1419.50 9005.45
1955 1800.00 1655.63 a 1606.00 446.50 214.00 80.00 8.50 11.50 269.50 561.50 1433.50 1920.00 10006.63
1956 1879.50 1789.50 1508.00 961.00 370.00 21.50 30.00 23.25 e 344.50 474.00 1061.50 1600.00 10062.75
1957 1994.50 1536.00 1210.03 a 708.50 288.00 134.00 0.00 60.00 354.00 644.00 1163.50 1449.50 9542.03
1958 1546.50 1531.50 1128.50 637.00 264.00 191.50 47.00 56.50 196.50 548.50 1131.50 1820.00 9099.00
1959 2036.00 1684.00 1153.50 673.00 379.00 61.50 19.00 9.50 245.00 783.50 1363.50 1283.00 9690.50
1960 1796.50 1610.00 1520.50 713.50 292.00 89.50 25.50 9.00 213.00 555.50 1089.50 1742.50 9657.00
1961 1801.50 1366.00 998.00 828.50 342.50 36.50 14.00 7.00 311.00 567.00 1084.50 1787.50 9144.00
1962 1928.50 1691.50 1376.50 812.00 331.50 71.00 14.00 18.00 291.50 491.87 a 983.50 1542.50 9552.37
1963 1975.50 1537.00 1045.00 631.50 356.00 44.00 4.00 16.50 125.00 267.50 961.50 1819.00 8782.50
1964 1615.50 1387.00 1408.00 633.50 202.00 115.50 3.00 90.00 289.50 562.00 1057.50 1913.50 9277.00
1965 2032.00 1625.50 1516.50 708.62 a 325.50 50.00 16.50 0.00 z 0.00 z 532.00 1197.00 1424.50 9428.12
1966 2227.50 1670.00 1124.50 812.50 420.50 85.00 2.00 68.50 211.50 629.50 1278.50 1731.00 10261.00
1967 1831.50 1821.68 c 1292.00 849.50 485.50 104.50 54.50 52.50 180.00 629.50 1081.00 1547.50 9929.68
1968 1851.50 1674.50 1038.00 648.00 382.50 107.00 45.00 104.00 251.00 643.00 1059.00 1760.00 9563.50
1969 2122.50 1545.50 1596.00 658.50 0.00 z 221.50 22.00 9.00 224.50 766.50 1047.00 1535.50 9748.50
1970 2040.50 1551.00 1601.00 783.50 394.50 36.50 6.50 31.50 250.50 585.50 1137.00 1763.50 10181.50
1971 2117.50 1522.00 1271.50 687.00 342.00 25.50 50.00 32.00 241.50 542.50 1116.50 1645.00 9593.00
1972 1970.00 1761.50 1305.00 760.00 212.50 63.00 36.50 45.00 286.50 697.50 1154.00 1878.00 10169.50
1973 1660.00 1372.50 899.00 670.00 260.00 0.00 z 24.00 2.00 245.50 418.50 1198.50 1705.00 8455.00
1974 2016.00 1593.50 1381.50 703.00 401.00 61.50 2.00 93.00 331.00 556.50 1068.00 1381.00 9588.00
1975 1655.83 b 0.00 z 0.00 z 0.00 z 258.50 78.00 14.50 44.00 265.00 499.50 1014.50 1588.50 5418.33
1976 1789.50 1288.50 1336.50 536.00 234.00 43.50 4.50 13.50 217.00 760.00 1198.50 1831.00 9252.50
1977 2075.50 1300.50 1042.00 454.00 61.50 35.00 16.50 128.00 272.00 576.00 1226.00 1857.50 9044.50
1978 2133.00 1755.19 a 1362.50 709.50 211.50 104.00 32.50 37.00 171.00 592.50 1306.50 1815.50 10230.69
1979 2195.00 1917.00 1437.50 927.50 0.00 z 0.00 z 0.00 z 0.00 z 161.00 631.00 1165.50 1336.50 9771.00
1980 1441.00 f 1593.00 1356.00 459.50 199.50 51.00 8.00 37.00 255.50 662.00 951.00 1628.00 7200.50
1981 1560.50 1228.00 954.00 540.00 244.50 70.00 14.50 4.00 229.82 b 584.00 820.00 1630.50 7879.82
1982 2233.50 1527.50 1264.50 709.50 0.00 z 163.50 1.50 74.50 249.50 575.50 1210.50 1357.50 9367.50
1983 1476.50 1218.50 1102.00 702.50 403.00 49.50 13.50 0.00 268.50 614.00 1014.00 2005.00 8867.00
1984 1700.00 1170.00 0.00 z 583.50 338.00 49.50 10.50 17.50 325.50 547.50 1084.00 1756.50 7582.50
1985 1823.00 1531.50 986.50 501.00 145.50 138.00 13.00 71.50 313.00 624.00 1476.50 1929.50 9553.00
1986 1614.50 1542.50 1012.00 641.00 207.70 a 20.00 3.00 80.00 286.50 612.00 1334.50 1437.50 8791.20
1987 1526.50 1098.50 1136.50 372.50 148.50 25.50 13.50 51.00 142.00 668.50 927.50 1369.50 7480.00
1988 1850.50 1604.50 1146.50 562.00 144.50 5.50 2.00 23.00 211.00 668.50 1124.50 1566.00 8908.50
1989 1711.50 1759.50 1432.00 732.50 199.00 70.50 0.00 19.00 172.00 569.50 1225.50 1867.00 9758.00
1990 1391.00 1342.00 1095.00 673.50 301.50 53.50 6.50 15.00 162.00 578.00 1022.50 1702.50 8343.00
1991 1832.00 1234.50 1078.00 519.50 220.00 4.00 2.50 5.00 252.00 783.00 1304.00 1475.00 8709.50
1992 1529.50 1271.00 1077.00 749.00 217.50 134.50 94.00 88.50 272.00 623.00 1168.00 1745.00 8969.00
1993 1824.50 1510.00 1173.50 690.00 286.00 161.50 61.50 53.00 355.50 700.00 1199.00 1599.00 9613.50
1994 2198.50 1747.50 1103.00 682.00 243.50 42.50 33.50 65.50 172.00 521.00 1002.00 1440.47 a 9251.47
1995 1703.00 1516.00 1191.50 845.00 387.00 75.50 27.00 1.50 258.00 663.50 1344.00 1681.00 9693.00
1996 2020.00 1503.50 1425.50 893.00 366.50 71.50 10.50 4.50 212.50 561.50 1418.00 1856.50 10343.50
1997 1980.00 1430.00 1352.00 859.00 419.50 10.50 48.50 54.50 150.00 626.00 1252.50 1281.00 9463.50
1998 1743.50 1092.50 1248.00 491.50 195.50 0.00 z 0.00 z 0.00 z 0.00 z 577.78 b 1142.00 1604.50 8095.28
1999 1886.00 1299.50 1150.00 621.50 297.00 91.50 11.00 38.50 324.00 681.00 881.50 1346.00 8627.50
2000 1759.50 1212.50 925.50 0.00 z 0.00 z 0.00 z 0.00 z 31.50 269.50 563.00 0.00 z 0.00 z 4761.50
2001 1595.00 1698.00 1235.00 661.00 251.50 108.50 18.00 26.00 226.50 709.50 834.50 1463.00 8826.50
2002 1585.00 1196.50 1450.50 770.00 529.50 48.10 a 5.50 39.00 198.00 933.00 1161.00 1417.00 9333.10
2003 1738.00 1664.50 1315.00 637.50 316.50 74.00 16.50 19.00 281.50 558.50 1315.50 1450.50 9387.00
2004 2009.50 1509.50 1188.50 726.50 483.00 151.50 68.50 149.50 185.00 615.50 985.50 1550.50 9623.00
2005 1929.50 1443.50 1243.00 538.00 383.50 42.50 33.00 46.00 152.00 577.00 1034.50 1469.50 8892.00
2006 1318.00 1150.50 1247.00 483.50 289.00 28.50 6.50 10.00 264.50 747.50 1091.00 1327.00 7963.00
2007 1694.00 1689.50 1170.00 703.00 247.50 57.50 13.00 56.50 248.00 549.00 1098.50 1766.48 a 9292.98
2008 1869.50 1747.00 1345.50 750.00 423.00 114.00 18.00 25.50 231.50 596.00 1078.50 1950.00 10148.50
2009 2012.00 1551.93 a 1355.50 760.50 449.00 144.00 49.50 70.50 78.50 794.50 850.50 1784.50 9900.93
2010 1785.00 1567.00 1004.50 459.50 296.50 81.50 2.00 24.00 305.00 511.00 1123.00 1727.50 8886.50
2011 1927.17 d 1502.87 e 1391.50 690.00 b 377.00 90.50 6.50 9.50 237.00 480.00 994.50 1333.50 9040.04
2012 1498.00 1319.50 803.50 559.50 244.50 42.50 0.00 22.50 253.50 723.00 1158.00 1649.50 8274.00
2013 1742.20 a 1505.50 1505.50 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 4753.20
Period of Record Statistics
MEAN 1861.61 1552.64 1275.96 688.29 332.75 96.23 25.85 52.49 261.70 626.45 1145.33 1649.13 9548.68
S.D. 224.79 206.98 184.09 132.53 103.11 50.94 22.40 35.78 70.78 114.92 161.46 192.86 663.58
SKEW 0.06 -0.03 -0.25 0.16 0.27 0.44 1.15 0.54 0.02 0.33 0.35 -0.03 -0.39
MAX 2366.50 2264.50 1606.00 1040.50 647.50 246.50 98.50 149.50 429.00 998.50 1636.00 2044.50 11228.58
MIN 1318.00 1081.00 803.50 372.50 61.50 4.00 0.00 0.00 78.50 267.50 820.00 1281.00 7480.00
NO YRS 119 119 117 118 115 112 115 115 117 118 119 115 97