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
1893 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
1894 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
1895 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
1896 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
1897 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 11.50 z 152.00 570.00 1213.33 c 1751.00 3686.33
1898 1603.00 1456.50 1167.50 756.50 435.00 147.50 72.50 101.00 271.50 788.50 1206.50 1773.00 9779.00
1899 1895.50 1824.50 1699.00 746.50 469.00 125.00 23.50 45.00 344.00 597.50 812.00 1542.50 10124.00
1900 1564.00 1048.00 j 321.00 y 516.00 300.50 113.00 65.50 6.00 259.00 340.50 1242.00 1559.00 5965.50
1901 1779.50 1678.00 1314.00 669.50 265.50 115.50 16.50 36.50 298.00 574.50 1178.50 1698.00 9624.00
1902 1685.50 1448.00 1076.50 772.50 325.00 175.50 27.00 92.00 363.50 653.50 1026.00 1717.50 9362.50
1903 1859.00 1627.00 1206.50 730.00 317.50 152.50 65.50 170.00 352.00 593.00 1199.50 1861.50 10134.00
1904 2008.50 1913.00 500.00 u 859.04 d 402.00 153.50 73.00 103.50 345.50 648.50 918.50 1603.50 9028.54
1905 1945.50 1635.00 1085.00 781.00 488.00 171.00 36.50 28.50 166.00 724.48 d 1040.00 1465.50 9566.48
1906 1580.00 1614.00 1468.00 580.50 409.00 82.00 27.50 55.50 127.00 604.50 1013.04 b 1611.00 9172.04
1907 1966.00 1484.00 1237.50 964.00 674.50 107.50 17.00 76.50 309.00 623.00 1011.72 a 1373.50 9844.22
1908 1553.00 1377.00 1206.50 629.50 411.50 132.00 43.50 107.00 153.00 552.50 955.50 1504.50 8625.50
1909 1740.00 1480.50 1261.50 948.50 471.50 89.00 15.50 d 30.50 259.00 661.50 931.00 1674.50 9563.00
1910 0.00 z 1672.00 0.00 z 0.00 z 464.50 139.00 38.00 106.00 269.00 505.00 1217.00 1645.50 6056.00
1911 1906.50 1411.50 1162.50 777.00 357.50 91.00 105.50 166.00 321.50 701.63 a 1361.00 1413.60 a 9775.23
1912 2314.50 1684.00 1483.35 a 666.50 383.88 a 186.00 67.68 a 153.50 322.50 580.50 984.50 1475.60 a 10302.52
1913 1902.50 1676.00 1514.00 631.50 517.50 125.50 63.50 57.50 307.50 752.50 905.00 1214.00 9667.00
1914 1575.50 1857.00 1296.50 813.00 302.50 143.00 16.50 110.00 228.50 457.00 1074.50 1772.00 9646.00
1915 1806.50 1262.00 1207.50 463.50 510.50 252.00 120.00 127.50 286.00 584.50 1060.50 1462.50 9143.00
1916 1960.00 1708.50 1399.50 807.00 442.50 216.50 2.50 110.00 449.50 776.00 1201.00 1913.22 a 10986.22
1917 2040.00 1885.00 1382.50 921.50 574.50 293.50 70.00 173.00 298.50 956.00 930.00 1939.00 11463.50
1918 2032.00 1517.00 1014.00 745.50 348.50 82.50 38.00 30.00 461.00 637.50 987.50 1394.50 9288.00
1919 1550.50 1515.50 1306.50 720.00 370.00 80.50 17.50 86.50 251.50 828.50 1339.50 1886.50 9953.00
1920 1992.50 1624.50 1291.50 982.00 376.00 128.50 56.50 72.50 200.50 519.00 1209.00 1511.50 9964.00
1921 1612.00 1354.50 1242.50 675.00 369.50 107.50 2.50 40.50 249.50 586.50 1176.50 1428.50 8845.00
1922 1761.00 1620.50 1172.00 731.50 161.50 68.00 52.50 33.00 203.00 521.50 917.00 1638.50 8880.00
1923 1659.00 1712.50 1560.00 751.50 322.50 47.50 5.50 129.00 222.00 601.50 896.00 1290.50 9197.50
1924 1990.50 1392.50 1232.00 776.00 599.50 207.00 60.50 136.50 364.00 418.00 1119.00 1929.75 a 10225.25
1925 1761.00 1396.00 1132.50 515.50 423.00 163.50 78.50 44.50 244.00 968.00 1032.50 1619.00 9378.00
1926 1650.50 1394.50 1443.05 a 783.00 303.00 226.00 43.00 85.00 400.00 722.50 1285.00 1721.00 10056.55
1927 1800.50 1418.00 1126.00 758.50 561.00 193.00 84.00 175.50 247.50 560.50 1254.50 1964.00 10143.00
1928 1749.50 1470.50 1301.50 904.50 290.50 219.00 39.00 77.00 354.50 569.00 911.50 1324.50 9211.00
1929 2119.00 1685.50 1146.00 705.50 492.50 182.50 35.50 68.50 370.50 607.50 1216.50 1667.00 10296.50
1930 2028.50 1300.50 1252.50 688.00 376.50 81.00 42.00 43.00 260.36 b 688.50 1007.50 1468.50 9236.86
1931 1466.50 1119.00 1207.00 662.00 417.50 104.00 30.50 96.50 176.00 451.50 887.00 1221.00 7838.50
1932 1539.00 1510.00 1492.00 750.50 336.00 38.00 58.00 61.00 335.00 763.50 1206.50 1653.85 a 9743.35
1933 1546.50 1692.50 1311.50 804.50 370.00 34.00 12.00 95.50 180.50 779.00 1238.00 1758.00 9822.00
1934 1578.50 1575.50 1390.50 782.31 d 250.00 108.10 a 82.50 198.00 414.00 584.50 985.00 1740.00 9688.91
1935 1957.00 1273.50 1255.00 853.00 496.00 227.00 4.50 112.00 340.00 687.50 1288.50 1587.50 10081.50
1936 2053.00 2055.50 1277.00 986.50 273.00 166.50 31.00 101.00 231.00 794.00 1245.50 1536.00 10750.00
1937 2091.50 1610.50 1433.00 845.50 354.50 159.00 55.50 33.00 293.50 770.00 1173.50 1682.00 10501.50
1938 1836.50 1390.50 1038.00 763.00 447.00 109.00 51.00 45.00 312.50 515.50 1181.50 1591.50 9281.00
1939 1653.85 a 1776.50 1409.00 853.50 262.00 103.50 29.00 52.50 276.00 683.00 961.00 1231.00 9290.85
1940 1887.50 1442.00 1462.50 813.00 435.50 165.50 67.50 122.00 209.50 505.00 1219.50 1473.50 9803.00
1941 1664.50 1494.50 1338.50 545.00 233.50 140.00 29.00 86.50 241.00 579.50 997.00 1371.00 8720.00
1942 1507.00 1436.00 1063.00 524.50 433.50 136.00 68.50 60.50 358.00 587.50 1087.00 1673.50 8935.00
1943 1902.00 1440.00 1486.00 742.00 422.50 121.50 9.00 46.00 335.00 579.50 1203.50 1460.50 9747.50
1944 1353.00 1505.50 1337.50 799.00 320.00 106.00 28.50 67.00 252.00 527.00 912.50 1546.00 8754.00
1945 1735.50 1442.50 972.00 786.00 504.50 244.50 59.00 46.50 344.50 669.00 1147.50 1700.50 9652.00
1946 1700.00 1589.50 913.00 611.00 449.50 139.50 38.50 107.00 300.00 626.00 1103.50 1608.00 9185.50
1947 1597.00 1580.50 1332.00 835.50 499.00 172.00 43.00 30.50 331.50 341.00 1261.50 1605.50 9629.00
1948 1928.50 1634.00 1312.00 639.50 357.50 145.50 36.50 55.00 175.00 568.00 1057.50 1613.00 9522.00
1949 1681.00 1619.00 1348.00 638.00 308.00 64.50 30.50 52.18 a 331.00 570.92 a 964.50 1581.00 9188.60
1950 2027.00 1506.00 1453.50 1008.62 a 492.00 122.50 52.00 145.00 239.48 a 519.25 a 1214.50 1773.00 10552.85
1951 1850.50 1450.50 1419.00 798.00 245.42 a 160.86 a 55.00 115.50 368.50 658.00 1270.00 1674.00 a 10065.28
1952 1792.46 c 1299.00 1352.00 606.00 360.00 73.50 40.50 93.00 a 257.50 742.50 1004.50 1365.50 8986.46
1953 1655.50 1433.70 a 1202.50 814.00 375.00 95.00 44.00 27.68 c 264.00 389.50 903.00 1522.62 a 8726.50
1954 1910.50 1116.50 1335.00 762.00 515.12 a 96.50 30.50 81.50 300.50 642.50 944.46 b 1359.00 9094.08
1955 1694.50 1569.00 1485.50 526.55 a 246.00 99.00 10.00 22.50 282.50 547.67 a 1295.50 1774.20 c 9552.92
1956 1689.50 1649.00 1372.00 835.86 a 417.50 64.00 79.05 a 74.00 352.50 399.79 b 1018.50 1513.00 9464.71
1957 1965.50 1485.50 1329.00 733.00 365.50 119.50 6.00 67.00 325.50 636.07 d 1051.61 b 1429.62 a 9513.80
1958 1501.00 1518.50 1147.00 627.50 345.65 a 277.50 70.50 90.00 237.41 a 577.78 b 1024.00 1803.00 9219.84
1959 1942.50 1517.50 1171.50 719.00 323.00 105.00 45.50 35.50 266.50 751.00 1364.50 1281.85 a 9523.35
1960 1713.50 1527.50 1497.50 719.00 348.50 143.00 40.50 9.00 l 290.17 a 586.42 a 989.50 1602.50 9458.09
1961 1771.50 1219.50 984.50 863.50 406.00 85.00 27.50 19.00 301.00 530.50 1056.00 1591.00 8855.00
1962 1869.50 1511.50 1160.50 794.50 307.50 124.50 60.00 46.50 325.00 531.00 929.00 1526.50 9186.00
1963 1981.00 1584.50 1071.00 627.00 385.50 87.50 14.00 67.50 191.00 260.00 903.50 1765.50 8938.00
1964 1481.00 1371.50 1343.00 684.00 244.50 136.00 9.00 145.00 284.00 585.00 999.50 1745.50 9028.00
1965 1865.00 1615.00 1517.00 729.50 289.50 117.00 39.50 83.50 470.17 a 529.50 1062.50 1303.50 9621.67
1966 2072.50 1467.00 1058.00 822.50 443.50 92.50 1.00 95.00 260.50 613.50 1159.50 1583.00 9668.50
1967 1660.50 1670.00 1186.00 735.50 520.00 113.50 56.00 88.00 207.50 652.50 1105.50 1500.40 a 9495.40
1968 1709.50 1554.00 964.50 641.50 418.50 111.00 62.52 a 77.00 227.50 521.00 1022.00 1625.00 8934.02
1969 1828.00 1368.00 1305.00 640.50 338.50 253.50 48.00 15.50 238.00 714.00 1049.50 1449.00 9247.50
1970 1910.50 1445.50 1378.00 778.00 439.50 82.24 a 24.00 39.50 283.50 589.50 1116.00 1677.50 9763.74
1971 1987.50 1433.00 1282.50 692.00 401.00 54.00 84.00 84.50 245.00 481.00 1079.50 1585.00 9409.00
1972 1974.50 1684.50 1336.00 838.50 248.50 94.00 60.00 81.00 320.50 710.50 1120.00 1768.00 10236.00
1973 1606.00 1371.50 913.00 704.50 396.00 67.50 33.50 24.50 265.50 411.00 1033.50 1529.33 a 8355.83
1974 1780.00 1448.22 a 1272.50 696.00 437.00 88.00 10.00 93.50 351.50 550.50 987.50 1302.50 9017.22
1975 1663.50 1419.00 1408.50 892.00 229.50 109.00 21.00 46.50 313.00 473.00 968.50 1595.00 9138.50
1976 1790.77 a 1213.00 1212.21 b 533.50 304.50 40.00 18.00 62.50 249.00 778.50 1259.00 1882.50 9343.47
1977 2108.00 1320.00 981.50 516.00 127.50 78.50 24.50 168.50 275.00 585.50 1067.00 1648.50 8900.50
1978 1855.50 1588.50 1175.50 697.50 245.00 105.50 36.50 50.50 181.50 536.00 1097.50 1695.00 9264.50
1979 2083.50 1647.00 1239.50 848.79 a 484.00 136.00 13.50 79.50 196.00 660.82 a 1058.50 1374.00 9821.11
1980 1749.50 1503.50 1329.00 587.00 218.00 106.03 a 9.30 a 50.00 323.00 727.00 975.50 1712.50 9290.33
1981 1626.00 1259.00 978.00 607.50 348.50 114.00 39.00 43.00 298.00 673.00 880.00 1562.50 8428.50
1982 2140.50 1509.00 1332.50 824.50 264.00 238.50 37.00 141.00 298.50 576.00 1184.00 1439.00 9984.50
1983 1650.50 1248.50 1159.00 806.00 440.50 126.00 10.50 1.00 222.50 551.00 1029.00 1967.50 9212.00
1984 1700.50 1142.50 1314.00 609.00 371.00 49.50 27.00 20.00 353.50 503.00 1060.00 1608.00 8758.00
1985 1747.00 1472.00 979.00 556.50 194.50 173.50 15.50 106.00 286.00 584.50 1278.50 1860.50 9253.50
1986 1551.00 1430.00 1033.00 558.50 291.50 77.50 17.00 80.50 261.50 542.50 1182.00 1407.00 8432.00
1987 1498.00 1038.50 943.50 440.50 267.50 44.50 19.50 62.50 178.00 703.50 914.50 1334.50 7445.00
1988 1829.50 1665.89 b 1182.50 647.50 186.00 33.50 14.50 51.00 213.62 a 733.00 1026.50 1575.00 9158.51
1989 1567.50 1670.00 1352.50 785.00 296.50 100.50 6.00 39.50 207.50 554.00 1173.50 1826.00 9578.50
1990 1340.50 1339.00 1064.00 707.00 389.50 63.00 34.50 58.00 233.50 692.50 466.50 o 1088.50 j 5921.50
1991 1889.45 a 1272.92 b 640.50 n 604.00 269.50 49.00 36.00 21.50 292.00 389.00 n 714.00 n 1015.00 k 4434.37
1992 1521.58 a 744.00 l 0.00 z 494.00 m 278.50 176.00 137.50 51.00 l 206.50 k 336.50 p 524.00 p 899.50 m 2113.58
1993 1065.50 m 730.50 o 667.00 m 797.00 393.00 201.50 50.50 51.50 417.50 457.50 k 660.50 m 940.50 l 1911.00
1994 1031.00 p 1710.07 a 1127.88 a 727.00 265.50 82.00 39.00 91.45 a 191.00 332.00 l 529.00 l 831.00 m 4233.91
1995 1717.29 b 847.00 m 870.50 i 494.50 n 358.00 65.50 52.50 15.50 274.50 366.00 l 586.00 q 831.00 p 2483.29
1996 2098.91 b 1583.09 a 971.50 k 898.00 411.50 95.00 37.50 20.00 248.50 645.50 657.00 o 0.00 z 6038.00
1997 897.00 p 762.50 l 751.50 l 779.00 510.50 46.50 65.00 95.50 173.50 409.00 k 644.00 o 840.50 j 1670.00
1998 989.50 l 704.50 i 859.00 i 599.48 a 176.50 150.50 19.00 11.00 150.00 367.50 l 571.50 m 850.50 l 1106.48
1999 1116.50 m 816.50 j 806.00 h 439.50 h 220.00 f 125.00 18.00 f 27.00 h 257.14 b 413.50 l 527.50 k 923.00 j 382.14
2000 1158.50 k 827.00 k 517.00 n 482.50 j 310.00 b 187.50 38.23 a 25.32 a 286.15 d 293.00 k 647.50 k 1045.00 n 847.20
2001 1009.00 j 1115.00 j 881.00 i 391.50 k 40.50 y 102.50 27.50 16.57 b 197.50 g 403.50 i 347.00 p 611.00 o 146.57
2002 1017.00 k 1256.50 951.50 k 797.50 496.50 72.00 13.00 35.50 198.50 881.00 551.00 o 0.00 z 3750.50
2003 1086.00 l 0.00 z 879.50 j 474.50 k 284.00 f 116.50 34.00 15.00 269.50 433.50 i 641.50 m 1002.00 j 435.00
2004 1186.50 l 979.50 j 814.50 i 515.00 h 457.85 e 188.00 67.50 176.00 155.00 370.50 k 553.50 k 859.50 n 1044.35
2005 1146.50 l 842.50 k 970.00 h 266.50 n 437.50 51.00 39.00 54.50 176.40 e 345.00 k 515.50 n 874.00 m 758.40
2006 680.50 o 1003.50 i 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 514.00 j 571.50 m 849.00 k 0.00
2007 1053.50 k 1093.00 i 787.00 i 398.00 m 259.00 47.00 27.00 65.00 257.59 a 370.50 i 600.50 m 1039.50 l 655.59
2008 1151.50 k 1181.50 i 869.50 k 520.00 i 362.00 f 135.00 17.00 33.00 186.50 g 608.50 633.50 j 1900.19 d 2693.69
2009 2038.77 a 1020.50 h 908.50 i 464.00 j 0.00 z 176.00 0.00 z 103.00 77.00 g 572.00 h 374.00 p 1083.00 k 2317.77
2010 1025.00 m 1012.50 i 643.50 i 357.50 h 299.87 e 151.00 5.00 32.00 359.00 334.00 k 662.00 j 1079.00 k 846.87
2011 785.50 r 804.00 l 962.50 h 558.50 g 375.58 e 139.14 a 6.95 b 19.50 f 240.60 e 304.00 l 955.00 c 839.50 l 1717.26
2012 954.50 k 801.00 j 545.00 j 423.00 l 266.27 c 48.10 a 3.50 40.50 293.79 a 682.60 e 1043.65 d 811.50 n 2378.41
2013 836.00 o 689.00 o 632.00 q 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
Period of Record Statistics
MEAN 1788.42 1504.03 1253.99 729.50 368.98 124.07 38.82 72.90 275.97 610.99 1082.21 1594.52 9455.13
S.D. 196.68 180.24 165.72 120.14 101.13 55.91 25.67 43.74 69.82 121.94 129.09 181.21 628.80
SKEW 0.07 0.08 -0.09 -0.10 0.18 0.72 0.96 0.75 0.30 0.16 0.23 0.00 0.05
MAX 2314.50 2055.50 1699.00 1008.62 674.50 293.50 137.50 198.00 470.17 968.00 1364.50 1967.50 11463.50
MIN 1340.50 1038.50 913.00 440.50 127.50 33.50 1.00 1.00 127.00 260.00 812.00 1214.00 7445.00
NO YRS 97 96 91 99 109 114 112 110 111 98 95 94 88