date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Oct 29, 2012
*** Note *** Provisional Data *** After Year/Month 201210
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
1889 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
1890 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
1891 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
1892 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
1893 1897.00 1511.00 1341.50 878.50 505.00 34.00 16.50 81.50 296.90 a 602.90 b 1088.50 1620.78 a 9874.08
1894 1662.78 b 1443.56 a 1005.00 603.00 379.50 66.00 28.50 52.00 217.00 570.00 1205.00 1266.00 8498.33
1895 1771.50 1568.50 1292.00 566.00 328.00 45.00 48.50 52.70 a 183.00 811.50 1092.50 1416.00 9175.20
1896 1578.00 1409.50 1336.50 605.00 178.00 50.50 30.50 80.50 345.50 760.02 a 1277.50 1362.00 9013.52
1897 1645.50 1312.50 1292.00 718.00 429.00 207.50 11.50 113.50 161.50 484.00 1139.00 1627.50 9141.50
1898 1467.00 1326.37 a 1071.50 751.00 351.50 51.50 29.00 46.50 a 185.50 687.68 a 1093.00 1669.50 8730.05
1899 1765.50 1668.50 1551.50 640.50 328.50 56.00 27.90 a 3.00 385.00 525.00 842.00 1523.00 9316.40
1900 1511.00 1685.50 1410.00 587.14 b 363.00 89.50 54.50 0.50 214.50 344.50 1147.78 c 1448.73 a 8856.65
1901 1647.50 1539.00 1310.50 616.00 338.50 87.00 27.50 45.50 214.66 a 472.50 1079.00 1496.00 8873.66
1902 1522.21 b 1354.50 939.00 623.50 256.00 122.00 5.00 36.00 214.50 577.50 874.00 1451.50 7975.71
1903 1558.50 1430.00 919.50 637.50 240.50 127.00 29.50 92.00 259.50 545.50 1113.00 1681.00 8633.50
1904 1795.50 1703.50 1200.50 824.50 325.00 62.00 50.50 83.00 185.50 572.50 871.00 1445.50 9119.00
1905 1815.00 1508.50 1039.00 673.00 332.39 d 70.00 21.00 3.00 118.50 626.50 1001.50 1307.50 8515.89
1906 1400.00 1394.30 a 1362.50 541.50 364.50 69.00 14.00 24.50 89.50 589.50 943.00 1376.00 8168.30
1907 1668.32 a 1337.00 1034.50 890.69 a 537.50 81.00 16.00 48.00 m 235.00 626.20 a 1000.00 1302.50 8728.71
1908 1479.00 1331.00 1148.50 633.62 a 338.00 114.31 a 18.71 b 57.00 97.50 507.50 902.50 1414.50 8042.14
1909 1510.73 a 1246.00 a 1134.71 b 860.17 a 346.50 60.50 25.00 3.00 f 227.07 a 693.62 c 846.72 a 1596.50 8547.53
1910 1563.00 1491.00 742.00 525.50 445.50 115.50 22.50 46.50 315.50 496.00 1161.50 1459.58 a 8384.08
1911 1586.00 1232.50 1048.00 700.00 222.00 29.00 71.00 86.50 262.00 679.00 1263.00 1266.50 8445.50
1912 2139.00 1549.50 1371.00 610.00 305.50 137.00 34.50 125.00 272.50 554.00 949.50 1329.50 9377.00
1913 1595.00 1537.00 1307.50 576.21 a 387.00 88.00 44.50 40.00 254.00 630.00 832.50 1144.00 8435.71
1914 1393.00 1619.00 1182.50 724.00 267.50 125.50 12.00 87.00 246.50 387.50 992.00 1656.50 8693.00
1915 1649.00 1126.00 1207.00 419.50 470.00 207.00 87.00 161.00 240.50 552.50 984.00 1408.50 8512.00
1916 1626.00 1552.00 1299.50 692.00 388.50 187.50 0.00 70.00 288.00 623.00 1066.50 1652.00 9445.00
1917 1779.50 1712.00 1215.50 773.00 471.50 191.00 52.50 122.50 290.50 918.00 899.50 1744.50 10170.00
1918 1938.50 1445.50 959.00 744.00 254.50 97.76 a 39.50 39.00 410.50 539.00 886.50 1211.50 8565.26
1919 1386.50 1352.50 1112.50 669.00 380.50 36.00 5.17 a 75.50 199.50 647.50 1172.00 1783.50 8820.17
1920 1850.50 1479.50 1136.48 c 831.00 314.50 83.50 56.00 66.00 155.00 351.00 1065.50 1366.00 8754.98
1921 1414.50 1233.00 1043.00 509.00 273.00 52.50 4.00 34.00 138.00 515.50 1157.00 1464.00 7837.50
1922 1680.00 1468.50 1112.00 688.50 149.00 48.00 22.50 46.50 199.00 511.00 833.00 1483.50 8241.50
1923 1512.50 1604.50 1423.50 748.50 298.00 35.50 6.00 87.50 217.00 621.50 878.00 1134.50 8567.00
1924 1881.00 1329.00 1182.50 755.00 547.27 e 139.50 75.50 110.00 356.50 386.50 1008.00 1776.50 9547.27
1925 1630.50 1305.50 1059.00 479.00 460.00 103.50 59.00 25.00 174.00 922.50 1070.00 1582.00 8870.00
1926 1612.00 1279.50 1344.00 761.00 245.00 179.50 33.50 35.50 285.00 673.50 1195.00 1586.00 9229.50
1927 1693.12 a 1208.00 963.50 662.50 391.00 163.50 43.50 118.50 226.50 516.50 1069.00 1734.50 8790.12
1928 1586.50 1389.31 b 1164.00 869.00 267.50 179.50 18.50 42.37 a 319.00 540.50 938.50 1316.50 8631.18
1929 2011.00 1587.19 a 1088.62 a 666.35 d 440.50 108.50 23.00 49.00 264.50 594.50 1123.00 1471.50 9427.65
1930 1776.50 1172.00 1124.50 585.50 314.50 62.50 41.00 23.50 220.00 644.50 809.42 d 1144.50 g 6773.92
1931 1377.36 b 1074.50 1114.45 a 628.50 414.88 a 78.50 44.00 66.13 a 151.00 470.17 d 815.89 b 1210.07 b 7445.46
1932 1431.34 b 1401.32 a 1433.75 a 728.50 337.26 b 43.50 39.35 e 36.50 291.72 a 674.00 1151.00 1575.50 9143.75
1933 1406.76 b 1585.23 b 1223.43 b 706.50 295.53 a 36.50 0.00 z 0.00 z 141.43 b 678.38 a 1159.80 e 1222.00 h 7233.57
1934 1125.50 f 1087.00 h 983.00 g 572.50 f 96.00 k 50.50 0.00 z 0.00 z 0.00 z 0.00 z 920.50 1615.00 2586.00
1935 1739.50 1275.56 a 1126.69 b 0.00 z 474.82 a 192.50 2.50 83.38 b 265.86 a 628.50 1133.79 a 1484.00 8407.10
1936 1792.32 a 1857.50 1167.00 871.00 207.18 a 134.00 11.22 b 39.50 165.50 701.50 1115.00 1400.50 9462.22
1937 1779.50 1459.00 1320.00 769.82 b 321.22 b 142.00 28.42 a 22.22 a 277.50 720.23 a 1112.50 1571.50 9523.91
1938 1676.50 1264.00 982.00 660.00 a 353.92 a 138.00 25.00 29.00 287.00 507.00 990.50 1462.50 8375.42
1939 1430.00 1523.00 1221.50 771.50 222.00 113.00 32.00 40.00 233.50 599.50 960.50 1210.50 8357.00
1940 1780.50 1319.00 1357.00 767.07 a 414.50 113.57 b 43.50 106.00 202.50 523.50 1112.00 1400.50 9139.64
1941 1524.00 1387.56 a 1301.50 485.69 a 195.09 b 95.50 41.00 71.00 198.00 560.00 933.50 1238.00 8030.83
1942 1522.00 1416.00 1089.00 535.50 425.45 b 130.00 75.00 75.00 369.11 b 587.50 1110.00 1625.00 8959.55
1943 1800.00 1423.50 1490.00 787.00 400.00 105.50 16.03 b 49.00 363.00 605.00 1145.50 1429.00 9613.54
1944 1306.00 1389.50 1333.50 787.00 260.50 85.00 38.50 61.00 f 244.50 616.00 895.50 1571.00 8527.00
1945 1748.92 a 1453.50 927.00 735.50 503.50 233.50 80.00 68.50 282.00 672.00 1080.50 1675.50 9460.42
1946 1614.00 1471.50 843.00 606.50 423.00 154.00 39.00 101.00 296.00 520.50 1028.00 1443.00 8539.50
1947 1468.00 1470.00 1221.00 767.50 491.50 166.00 41.50 22.50 253.00 275.00 1173.00 1464.00 8813.00
1948 1778.50 1491.00 1223.50 543.50 348.00 95.17 a 24.59 b 42.22 b 140.00 564.00 883.89 c 1451.00 8585.37
1949 1517.45 a 1402.50 1187.30 a 627.41 a 286.23 a 44.50 16.00 44.50 314.00 485.50 969.00 1427.00 8321.40
1950 1722.00 1394.00 1356.50 928.50 398.50 125.17 a 68.50 0.00 z 223.50 444.50 1150.00 1638.00 9449.17
1951 1696.50 1371.00 1319.50 723.10 a 221.00 162.41 a 43.83 b 95.50 338.00 598.00 1252.00 1508.50 9329.34
1952 1564.00 1266.00 1247.50 572.50 356.50 80.69 a 29.50 60.00 253.50 764.84 b 958.97 a 1314.50 8468.50
1953 1503.50 1384.00 1213.59 d 793.50 320.00 75.50 45.50 34.62 a 263.00 373.50 835.50 1387.50 8229.71
1954 1667.00 1045.50 1233.36 c 631.00 509.50 86.00 22.00 58.50 269.46 b 647.00 922.50 1401.00 8492.82
1955 1648.50 1458.07 a 1371.48 b 507.00 298.63 a 114.50 9.50 27.38 a 222.00 499.21 b 1186.50 1635.25 a 8978.03
1956 1562.00 1473.00 1312.50 810.50 373.00 64.50 66.50 51.00 303.00 388.50 1029.00 1377.00 8810.50
1957 1809.50 1322.00 1148.00 634.50 368.00 99.50 14.50 66.50 310.00 629.50 1062.50 1405.50 8870.00
1958 1456.00 1453.00 1087.50 639.50 359.00 207.50 46.50 89.50 225.00 511.50 972.00 1672.50 8719.50
1959 1812.00 1491.00 1220.50 676.50 266.00 88.50 47.50 16.00 232.50 710.00 1299.50 1207.50 9067.50
1960 1517.00 1376.00 1463.50 641.00 347.50 154.00 56.00 24.50 250.00 566.00 927.50 1516.00 8839.00
1961 1591.50 1154.00 1048.00 785.00 400.00 108.00 22.50 28.00 268.50 516.00 1049.00 1528.00 8498.50
1962 1757.00 1447.50 1179.00 711.00 238.50 102.50 46.50 55.50 314.00 520.50 966.00 1484.00 8822.00
1963 1934.00 1580.50 1118.50 602.50 391.50 101.00 16.50 85.50 199.00 286.00 851.50 1727.50 8894.00
1964 1452.00 1328.00 1220.50 631.00 220.50 122.00 17.00 111.50 273.00 629.50 921.50 1616.00 8542.50
1965 1757.50 1509.00 1388.50 785.00 238.00 111.50 54.00 98.00 371.50 563.00 1015.00 1248.50 9139.50
1966 1877.50 1346.50 1060.00 760.50 476.50 103.00 13.50 92.50 273.50 611.00 1038.50 1472.00 9125.00
1967 1552.00 1579.00 1203.00 698.50 520.50 65.00 77.50 119.50 267.00 635.00 1105.50 1409.00 9231.50
1968 1619.50 1521.00 906.50 590.00 393.50 131.50 45.00 95.50 215.50 524.50 1005.00 1504.00 8551.50
1969 1695.50 1311.00 1337.00 592.00 319.00 280.50 43.50 16.00 236.50 661.00 1040.50 1443.50 8976.00
1970 1853.00 1455.50 1285.50 642.00 309.00 77.50 25.50 49.50 251.00 507.50 1044.00 1483.00 8983.00
1971 1869.50 1474.00 1335.50 722.50 452.00 79.50 78.00 106.00 252.00 392.00 994.50 1466.50 9222.00
1972 1910.50 1627.00 1356.50 847.50 252.00 152.50 74.50 84.50 269.50 738.00 1049.00 1649.50 10011.00
1973 1582.50 1319.50 877.00 743.00 476.00 60.50 17.50 41.50 281.00 434.00 1019.50 1518.50 8370.50
1974 1682.50 1482.00 1218.00 691.50 473.00 191.00 18.50 67.50 417.50 639.00 958.50 1332.50 9171.50
1975 1625.00 1404.50 1390.00 881.00 273.00 151.00 38.00 74.50 383.00 538.50 872.50 1484.50 9115.50
1976 1802.50 1265.50 1215.50 618.00 409.50 63.00 26.50 80.50 324.00 765.50 1268.50 1819.50 9658.50
1977 2050.50 1353.00 964.50 527.50 136.00 125.00 24.50 147.00 230.50 631.50 1042.50 1551.00 8783.50
1978 1783.50 1569.50 1253.50 746.00 320.00 151.50 62.50 55.00 205.50 671.15 a 1051.50 1682.00 9551.65
1979 1985.00 1632.81 a 1217.50 776.00 492.50 122.00 23.00 82.50 245.50 523.00 h 1058.00 1356.00 8990.81
1980 1675.00 1509.00 1318.50 643.50 276.50 142.50 18.00 42.50 301.00 747.00 1010.00 1536.50 9220.00
1981 1611.50 1276.00 1058.00 641.50 381.50 105.00 40.00 37.00 310.00 716.00 896.00 1482.66 b 8555.16
1982 1990.50 1496.50 1257.00 827.00 194.00 232.00 16.00 108.50 306.50 593.50 1066.50 1307.00 9395.00
1983 1502.50 1156.50 1070.50 799.00 498.00 134.00 16.00 4.50 259.00 589.50 964.50 1866.00 8860.00
1984 1700.00 1138.00 1339.50 599.00 425.00 45.00 39.00 24.50 329.50 526.50 1051.00 1518.50 8735.50
1985 1762.00 1479.50 1017.32 a 584.50 216.50 199.00 34.50 76.00 296.00 647.00 1202.50 1856.50 9371.32
1986 1626.50 1460.50 1127.00 543.00 259.00 109.50 37.50 122.00 263.00 632.00 1182.50 1406.50 8769.00
1987 1505.00 1138.50 0.00 z 518.00 262.00 74.50 21.50 78.00 0.00 z 801.50 900.50 1291.50 6591.00
1988 1819.00 1658.50 1154.00 653.00 198.00 76.00 10.00 53.00 237.00 794.00 986.00 1548.50 9187.00
1989 1521.50 1672.00 1360.50 771.00 364.00 150.50 17.00 46.00 250.00 550.50 1197.50 1865.50 9766.00
1990 1387.00 1416.00 1073.50 650.50 433.00 96.00 37.50 40.50 209.00 676.50 921.50 1554.50 8495.50
1991 1799.50 1323.50 1073.50 585.00 242.50 26.50 48.50 33.50 354.50 677.00 1224.00 1476.00 8864.00
1992 1501.00 1229.50 1179.50 775.00 306.50 153.00 112.00 125.50 325.00 658.50 1080.50 1444.00 8890.00
1993 1658.50 1410.00 1179.50 824.00 383.50 184.00 28.00 47.00 431.00 708.50 1104.50 1445.50 9404.00
1994 1980.00 1558.50 1102.00 722.00 327.00 86.00 44.50 104.50 172.00 536.00 914.50 1328.00 8875.00
1995 1592.00 1420.00 1070.50 857.00 367.50 73.50 40.00 7.00 306.50 615.50 1311.00 1623.00 9283.50
1996 1793.50 1533.00 1403.00 846.50 441.00 98.50 56.50 32.00 260.50 607.00 1243.00 1538.50 9853.00
1997 1752.00 1316.00 1194.00 751.00 500.00 54.00 63.50 100.00 193.50 602.50 1116.50 1284.50 8927.50
1998 1466.00 982.00 1100.50 523.50 155.50 159.50 8.50 7.00 126.00 555.00 898.00 1335.00 7316.50
1999 1753.00 1167.00 1090.00 545.50 242.50 104.00 13.50 54.50 294.50 681.50 823.50 1396.00 8165.50
2000 1682.27 a 1253.00 886.00 701.50 282.50 133.00 38.00 25.00 269.50 502.50 1048.00 1820.50 8641.77
2001 1511.00 1515.50 1227.50 614.00 279.50 137.50 33.00 22.00 274.50 651.00 720.50 1255.00 8241.00
2002 1381.00 1160.00 1324.00 740.50 499.00 81.00 6.00 32.50 199.00 785.50 1071.50 1355.50 8635.50
2003 1718.00 1555.00 1173.50 712.00 347.00 109.00 32.50 16.50 256.00 612.00 1060.50 1333.00 8925.00
2004 1798.50 1360.50 1080.00 661.50 415.00 159.00 39.50 169.50 123.00 576.50 924.00 1494.00 8801.00
2005 1679.50 1220.50 1260.00 529.50 409.00 19.00 17.00 38.00 140.50 529.50 998.50 1510.00 8351.00
2006 1263.00 1419.00 1088.00 492.00 338.50 54.00 4.50 19.50 304.00 755.50 929.00 1278.50 7945.50
2007 1485.00 1575.00 1022.00 679.50 234.00 59.00 26.50 48.50 217.50 473.00 1041.50 1588.00 8449.50
2008 1671.00 1606.50 1344.00 732.00 420.00 98.50 15.50 44.00 189.50 624.50 1014.00 1716.50 9476.00
2009 1939.50 1355.00 1178.50 705.50 341.52 a 155.00 102.50 102.50 131.50 777.00 806.00 1527.00 9121.52
2010 1599.00 1305.00 889.00 464.00 320.00 102.50 2.00 25.50 324.50 559.00 991.00 1560.00 8141.50
2011 1761.83 a 1407.00 1243.62 a 787.50 374.50 111.50 4.50 29.00 298.00 531.00 928.00 1346.50 8822.95
2012 1500.29 b 1222.50 677.50 630.50 234.50 77.07 a 0.50 58.00 290.00 469.50 i 0.00 z 0.00 z 4690.86
Period of Record Statistics
MEAN 1658.96 1410.04 1179.21 681.65 346.10 108.92 33.91 60.93 252.97 592.97 1026.33 1483.39 8847.59
S.D. 171.24 154.81 158.84 108.33 94.41 50.46 22.15 35.79 68.61 115.91 123.66 160.58 513.28
SKEW 0.21 -0.13 -0.42 -0.02 0.04 0.66 0.94 0.63 0.03 -0.04 0.10 0.26 -0.11
MAX 2139.00 1857.50 1551.50 928.50 547.27 280.50 112.00 169.50 431.00 922.50 1311.00 1866.00 10170.00
MIN 1263.00 982.00 677.50 419.50 136.00 19.00 0.00 0.50 89.50 275.00 720.50 1134.50 7316.50
NO YRS 119 119 118 118 119 120 118 114 118 117 119 117 109