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
1901 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 11.50 p 62.00 294.50 520.00 1112.50 1558.50 3547.50
1902 1535.00 1366.00 989.00 801.00 398.50 225.00 23.50 34.50 v 321.50 646.50 954.50 1493.50 8754.00
1903 1619.00 1434.50 1075.50 742.00 390.00 205.50 75.00 186.50 291.00 542.00 1130.00 1733.00 9424.00
1904 1824.50 1793.00 1325.50 913.50 462.00 120.00 b 75.78 d 112.50 338.50 677.50 895.50 1534.50 10072.78
1905 1766.50 1548.00 1153.50 779.00 475.50 163.50 56.50 47.50 183.50 478.50 i 1016.00 1347.00 8536.50
1906 1406.00 1438.50 1462.00 582.00 471.50 114.50 51.67 a 61.00 137.00 634.98 a 1022.00 1464.50 8845.65
1907 1809.00 1422.00 1168.50 1042.00 690.50 103.00 132.27 a 220.50 340.50 695.00 1068.50 1366.50 10058.27
1908 1168.50 h 1433.43 a 541.00 p 686.90 a 413.50 136.50 72.50 101.00 135.00 519.25 a 979.50 1476.50 5954.08
1909 1570.67 a 1382.00 1259.00 980.00 493.50 111.00 63.00 47.00 268.00 678.00 885.00 1501.43 a 9238.60
1910 1093.00 h 1530.67 d 786.50 583.45 a 401.00 h 158.28 a 33.00 79.29 e 269.48 a 512.00 1152.60 e 1535.69 e 6640.95
1911 1690.03 b 756.00 l 334.00 v 728.50 303.50 59.48 a 86.50 99.00 304.00 681.00 1253.50 1273.00 6478.52
1912 2180.50 1596.00 1359.87 a 689.50 340.00 197.59 a 59.00 204.50 300.50 575.00 942.41 a 1384.00 9828.87
1913 1651.00 1628.50 1382.60 a 664.14 a 472.50 123.60 e 57.35 a 62.00 319.50 652.00 827.00 1134.00 8974.19
1914 1443.00 1649.50 1318.00 840.00 310.00 168.50 26.00 124.50 245.50 430.00 1081.03 a 1628.00 9264.03
1915 1653.50 1177.00 1252.50 446.50 523.00 271.00 149.00 208.00 273.50 592.00 1005.50 1429.50 8981.00
1916 1698.50 1596.50 1384.00 797.00 458.50 269.00 0.00 98.50 362.50 682.00 1094.00 1701.26 b 10141.76
1917 1816.50 1742.50 1285.50 929.50 583.00 282.50 96.00 185.50 347.50 968.50 946.50 1781.47 a 10964.97
1918 1969.00 1513.00 1035.50 806.50 374.50 152.68 b 98.50 60.00 496.00 651.00 968.50 1233.50 9358.68
1919 1403.50 1352.50 1196.00 752.00 436.00 58.00 f 16.00 98.50 286.00 723.50 1216.00 1805.23 a 9285.23
1920 1864.50 1526.50 1204.50 986.50 400.00 162.50 97.00 85.50 175.00 370.45 a 1102.00 1399.00 9373.45
1921 1461.50 1279.50 1209.50 597.00 374.00 73.00 8.50 78.50 190.00 594.00 1229.50 1456.50 8551.50
1922 1643.00 1448.50 1117.50 759.50 137.50 76.00 g 62.00 63.00 196.50 561.50 875.00 1552.00 8416.00
1923 1554.98 c 1604.17 d 1480.50 774.00 335.00 60.50 9.00 105.00 220.00 611.00 843.50 1146.50 8744.15
1924 1804.00 1275.50 1195.50 758.00 586.00 184.50 82.00 85.85 e 351.00 336.50 1018.50 1783.50 9460.85
1925 1546.50 1287.48 a 1135.00 542.50 498.00 127.00 71.50 9.50 199.00 923.50 1030.00 1519.00 8888.98
1926 1550.00 1297.50 1401.72 a 825.50 307.50 223.00 20.00 58.00 382.50 698.02 a 1209.00 1571.00 9543.73
1927 1652.50 1230.00 1033.00 716.50 481.50 193.00 52.00 j 159.00 208.00 544.88 e 1125.00 d 1656.00 8999.38
1928 1547.50 1415.00 1263.00 911.00 319.00 240.50 26.50 100.50 328.93 b 585.50 935.00 1296.50 8968.93
1929 1956.00 1564.50 1106.50 669.50 474.50 193.00 39.50 69.50 322.50 589.00 a 1143.00 1502.50 9630.00
1930 1778.00 1202.50 1151.00 646.00 349.50 74.00 20.50 28.50 261.50 651.00 910.00 1395.00 8467.50
1931 1325.50 1083.50 1161.00 639.00 391.00 88.50 28.50 83.00 146.00 464.50 786.00 1158.00 7354.50
1932 1369.50 1375.50 1424.00 749.50 361.50 54.00 48.00 29.50 241.50 683.50 1148.50 1551.50 9036.50
1933 1406.50 1517.50 1253.00 789.00 289.50 30.50 13.50 51.50 179.00 735.00 1177.50 1634.00 9076.50
1934 1407.50 1534.00 1357.00 602.50 h 249.50 94.50 49.50 149.00 307.50 515.00 926.00 1587.50 8177.00
1935 1744.50 1282.00 1144.00 769.00 480.00 254.00 8.00 94.50 310.00 616.00 1193.50 1459.50 9355.00
1936 1744.00 1892.50 1214.17 a 928.00 286.23 a 171.00 15.00 68.00 179.00 780.00 1176.50 1439.00 9893.40
1937 1824.00 1417.00 1334.00 826.00 354.43 a 138.00 33.50 16.50 284.00 721.50 1097.00 1576.50 9622.43
1938 1670.00 1317.00 1002.50 727.00 428.00 170.00 30.50 33.50 223.50 440.50 987.50 1383.50 8413.50
1939 1388.50 1466.50 1221.00 811.00 254.50 97.00 29.00 42.76 b 234.00 594.00 896.50 1119.00 8153.76
1940 1744.50 1306.50 1416.50 802.50 498.00 177.00 56.00 105.00 205.00 519.50 1108.00 1381.50 9320.00
1941 1505.00 1378.00 1299.50 513.00 242.50 129.00 31.00 95.50 194.50 578.00 987.00 1260.50 8213.50
1942 1521.00 1394.00 1098.50 513.00 438.50 124.50 89.50 65.50 357.00 530.00 1066.55 a 1575.32 a 8773.37
1943 1020.00 l 1257.57 e 1447.00 815.89 b 403.00 a 135.00 14.50 68.89 d 320.00 f 556.50 1160.00 1415.00 7273.35
1944 1277.50 1374.00 1309.50 819.00 273.00 109.50 34.62 a 62.00 246.50 547.00 861.50 1514.50 8428.62
1945 1707.00 1355.00 862.00 743.00 543.50 244.50 88.00 74.00 298.50 638.50 1075.50 1587.50 9217.00
1946 1553.50 1473.50 839.50 636.50 406.00 159.00 28.00 115.00 238.97 a 508.50 1012.00 1448.00 8418.46
1947 1465.50 1506.50 1296.50 845.00 495.50 201.50 45.00 25.00 280.00 216.50 h 1174.50 1439.00 8774.00
1948 1725.00 1504.00 1260.00 599.00 388.00 128.50 26.50 53.50 169.50 549.50 933.00 1434.50 8771.00
1949 1453.50 1410.50 1263.50 602.59 a 290.88 a 51.50 17.57 a 36.00 302.00 484.50 1004.50 1457.50 8374.54
1950 1725.00 1385.50 1394.00 1021.00 425.50 130.50 92.00 209.00 257.50 470.00 1175.50 1585.00 9870.50
1951 1617.00 1331.00 1315.95 a 777.00 250.07 a 166.00 51.15 a 123.50 349.00 594.50 1235.89 b 1500.00 9311.06
1952 1542.50 1243.50 1257.05 a 578.00 346.50 76.50 28.00 63.03 a 214.00 700.50 919.00 1266.50 8235.08
1953 1441.50 1331.50 1107.00 825.00 368.50 78.50 27.00 25.50 95.00 u 399.00 907.20 e 1389.00 7899.70
1954 1685.50 1084.50 1317.50 a 745.00 566.50 122.59 a 56.00 85.00 302.00 642.00 923.50 1360.00 8890.09
1955 1599.00 1415.00 1370.31 d 489.50 270.98 b 98.57 b 0.00 z 33.77 c 274.04 d 0.00 z 0.00 z 1622.50 7173.68
1956 1515.50 1439.50 1296.83 a 836.50 428.50 68.50 97.50 74.50 346.00 404.50 1019.48 a 1400.50 8927.82
1957 1795.93 a 1382.37 a 1268.50 703.00 383.00 131.00 11.50 68.50 316.00 575.50 1043.00 1424.50 9102.80
1958 1452.00 1475.00 1200.50 656.50 404.50 239.50 70.00 108.00 213.00 528.50 984.50 1706.00 9038.00
1959 1853.50 1508.89 a 1218.00 733.50 276.00 99.00 45.00 31.52 a 236.00 722.50 1305.50 1238.50 9267.91
1960 1587.50 1428.50 1488.50 719.50 417.50 163.50 67.50 54.00 257.00 545.00 933.00 1555.50 9217.00
1961 1667.50 1203.50 1088.50 809.00 453.50 107.68 b 40.50 33.50 292.50 514.50 997.00 1489.50 8697.18
1962 1748.00 1519.50 1133.50 800.00 275.50 137.00 65.50 73.50 308.50 530.50 962.50 1498.50 9052.50
1963 1913.50 1620.50 1134.50 658.50 419.00 134.00 39.50 100.50 207.00 263.00 853.00 1658.00 9001.00
1964 1408.00 1372.50 1363.00 697.00 274.50 159.00 29.00 149.50 274.50 596.00 904.50 1629.50 8857.00
1965 1753.00 1554.50 1485.00 774.50 253.50 0.00 z 94.50 130.00 436.50 551.00 1029.00 1291.50 9353.00
1966 1867.00 1407.00 1098.50 840.50 501.00 110.50 13.00 125.00 272.50 608.00 1097.50 1478.50 9419.00
1967 1545.00 1593.50 1180.50 715.50 535.00 93.50 68.00 135.50 236.50 662.00 1134.50 1415.50 9315.00
1968 1634.00 1533.00 976.50 640.50 424.00 155.50 53.50 95.50 220.50 504.50 1019.50 1507.50 8764.50
1969 1626.00 1368.50 1380.50 614.00 342.50 303.50 62.50 24.50 253.00 676.66 b 999.50 1379.50 9030.66
1970 1795.50 1459.00 1359.00 706.00 423.50 96.00 34.00 50.50 264.00 510.00 1058.00 1484.00 9239.50
1971 1811.50 1429.00 1341.00 748.50 470.50 80.69 a 56.00 o 133.00 244.50 415.00 1033.00 1458.50 9165.19
1972 1831.50 1609.00 1393.50 876.50 288.00 147.00 72.00 75.50 315.00 a 702.00 1066.50 1614.50 9991.00
1973 1476.50 1314.00 921.50 741.50 317.00 n 55.50 j 51.50 j 79.05 a 350.00 458.50 1045.00 1553.50 7939.55
1974 1734.00 1583.00 1302.52 a 756.21 a 531.00 245.00 45.95 c 130.50 471.50 654.50 1005.50 1366.00 9825.67
1975 1593.00 1406.00 1353.50 964.00 319.50 182.50 59.00 105.50 412.00 555.00 933.00 1530.50 9413.50
1976 1785.50 1267.71 a 1297.00 667.00 510.50 96.50 85.00 147.50 387.41 a 823.50 1262.50 1801.50 10131.63
1977 2051.50 1385.44 c 1023.00 618.00 161.50 188.00 63.50 273.50 370.00 685.00 1023.50 1529.00 9371.94
1978 1774.00 1571.50 1320.50 817.00 372.50 198.00 102.50 105.00 237.50 647.00 1094.00 1645.50 9885.00
1979 2029.00 1649.00 1238.00 846.00 575.00 222.50 79.50 146.00 301.50 771.50 1104.50 1397.50 10360.00
1980 1718.00 1580.50 1467.00 0.00 z 0.00 z 153.00 i 81.63 a 108.00 408.50 857.50 1100.50 1675.00 8996.63
1981 1716.00 1351.50 1227.50 766.00 565.00 135.50 71.00 69.00 345.50 756.50 868.00 1462.50 9334.00
1982 2019.50 1514.50 1279.00 884.00 255.00 317.00 68.50 194.50 376.50 632.50 1162.50 1347.50 10051.00
1983 1554.00 1189.50 1150.50 934.50 574.50 187.50 35.50 31.50 283.50 668.00 1014.00 1859.50 9482.50
1984 1773.50 1173.50 1472.00 691.00 537.00 103.00 88.50 58.50 386.00 527.50 1029.00 1491.50 9331.00
1985 1755.50 1542.50 1066.00 664.00 324.00 241.50 83.50 156.50 308.00 612.00 844.00 j 1785.50 8539.00
1986 1592.00 1431.50 1127.00 598.00 297.08 a 166.50 59.50 148.00 310.00 669.00 1188.00 1394.00 8980.58
1987 1494.00 1145.00 996.50 575.00 316.50 99.00 48.50 100.00 235.00 811.00 930.50 1300.50 8051.50
1988 1754.71 b 1665.50 1257.57 a 754.00 263.00 129.50 42.50 90.00 291.00 817.00 0.00 z 1529.50 8594.27
1989 1505.50 1675.85 a 1454.50 879.50 414.00 230.69 a 44.50 88.00 299.00 615.50 1255.00 1861.50 10323.54
1990 1433.50 1420.00 1140.50 711.00 530.00 126.50 84.00 88.00 301.00 723.50 964.50 1548.50 9071.00
1991 1825.50 1335.00 1200.00 651.50 308.50 71.50 88.50 76.50 382.50 750.00 1242.00 1492.00 9423.50
1992 1514.50 1310.50 1294.50 894.00 370.50 250.50 202.00 212.50 363.00 718.50 1141.50 1488.00 9760.00
1993 1641.50 1468.50 1245.50 891.50 483.00 244.50 58.00 89.00 478.50 789.50 1191.00 1465.00 10045.50
1994 2025.00 1637.00 1227.00 844.50 422.00 131.00 82.50 144.00 222.50 574.50 976.00 1319.00 9605.00
1995 1582.50 1458.00 1168.00 987.00 466.50 115.50 74.00 28.50 381.00 646.50 1381.00 1628.50 9917.00
1996 1841.00 1615.00 1516.50 1008.50 531.50 152.50 144.00 81.00 315.00 658.50 1269.50 1536.50 10669.50
1997 1756.50 1392.00 1329.50 880.50 642.50 82.50 96.50 179.50 266.50 629.50 1177.50 1273.00 9706.00
1998 1505.00 990.50 1232.00 645.50 254.00 167.50 25.50 31.50 183.50 554.00 903.00 1306.50 7798.50
1999 1738.00 1208.50 1213.00 694.50 308.00 171.00 41.50 79.00 310.00 714.50 836.50 1372.50 8687.00
2000 1644.00 1258.00 992.50 797.00 371.00 238.50 72.00 54.50 324.00 513.00 1006.50 1803.50 9074.50
2001 1459.50 1558.00 1284.00 717.50 339.50 161.00 76.50 60.50 331.50 663.50 722.50 1252.00 8626.00
2002 1418.00 1192.00 1514.50 836.50 580.00 147.00 20.50 53.50 241.50 847.50 1128.50 1400.00 9379.50
2003 1737.50 1610.00 1299.00 866.00 430.50 174.00 67.00 49.00 253.50 675.50 1101.00 1345.00 9608.00
2004 1844.00 1359.50 1137.50 789.00 510.50 220.50 107.50 217.00 167.00 587.00 931.00 1521.00 9391.50
2005 1719.00 1244.00 1330.00 618.50 479.00 55.50 61.50 74.00 193.50 0.00 z 1010.50 1473.00 8258.50
2006 1266.00 1472.00 1189.00 554.00 394.50 129.50 24.50 45.00 352.00 786.50 923.00 1275.50 8411.50
2007 1514.50 1632.50 1110.00 807.50 284.50 91.00 61.50 65.00 233.50 491.50 1051.50 1555.50 8898.50
2008 1605.50 1622.50 1418.77 a 821.00 520.50 157.50 39.00 91.00 246.50 643.00 1063.00 1708.00 9936.27
2009 1876.50 1377.00 1239.50 790.00 444.50 218.50 153.50 146.50 147.00 806.50 827.00 1571.50 9598.00
2010 1548.50 1419.50 942.50 584.50 318.50 148.00 13.00 48.50 378.00 542.50 983.00 1525.72 a 8452.22
2011 1732.00 1385.50 1289.08 a 797.00 452.50 160.00 21.00 40.50 310.00 523.50 950.00 1324.00 8985.08
2012 1494.50 1233.50 742.50 728.00 287.50 99.50 5.50 92.00 349.00 471.00 j 0.00 z 0.00 z 5032.00
Period of Record Statistics
MEAN 1654.55 1426.55 1230.38 753.33 402.55 151.93 56.92 92.34 284.89 615.17 1038.33 1484.22 9222.42
S.D. 179.08 157.35 158.09 122.57 106.76 61.00 35.09 52.28 74.33 121.52 124.99 157.78 631.87
SKEW 0.25 0.00 -0.62 0.00 0.11 0.47 1.06 1.03 0.29 0.10 0.17 0.15 -0.05
MAX 2180.50 1892.50 1516.50 1042.00 690.50 317.00 202.00 273.50 496.00 968.50 1381.00 1861.50 10964.97
MIN 1266.00 990.50 742.50 446.50 137.50 30.50 0.00 9.50 135.00 263.00 722.50 1119.00 7354.50
NO YRS 108 110 109 109 108 106 107 111 110 107 108 111 90