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
1934 0.00 z 0.00 z 0.00 z 792.00 202.00 53.50 28.00 153.50 288.50 529.00 885.00 1521.00 4452.50
1935 1665.50 1305.00 1119.00 766.50 466.00 211.00 3.00 103.50 314.50 627.00 1077.32 b 1341.55 b 8999.87
1936 1675.50 1773.50 1117.03 a 870.00 203.50 123.00 7.50 63.50 182.00 714.50 1149.31 a 1390.50 9269.84
1937 1778.00 1451.50 1367.50 849.50 343.50 138.00 34.50 27.26 b 290.69 a 720.00 1080.50 1590.50 9671.45
1938 1664.00 1300.96 a 1049.50 698.00 398.35 a 141.50 30.00 12.00 h 211.50 g 498.58 a 923.57 b 1486.93 b 8191.40
1939 1494.00 1582.54 b 1278.75 c 810.56 c 300.59 c 105.50 j 47.02 a 40.00 149.48 a 643.50 966.11 c 768.00 i 7312.54
1940 1773.09 c 1416.17 e 1491.00 864.50 516.50 147.50 72.50 128.50 235.00 544.00 1085.69 a 1414.12 a 9688.56
1941 787.50 n 1410.00 1361.00 543.10 a 275.00 118.45 a 73.88 a 119.00 211.50 604.50 941.00 1240.00 6897.44
1942 1557.75 c 1424.37 a 1109.05 b 596.90 a 417.90 e 112.00 62.50 83.18 a 362.59 a 593.65 a 1046.00 1590.00 8955.89
1943 1767.50 1426.00 1490.00 885.00 456.22 a 95.17 a 14.50 66.13 a 364.66 a 216.50 o 1172.50 1425.00 9162.68
1944 1327.32 a 1390.45 a 1360.00 859.00 293.00 91.07 b 31.50 80.00 245.50 586.00 851.00 1533.50 8648.33
1945 1739.50 1419.00 916.00 743.50 538.00 261.00 89.00 82.50 310.50 665.50 1056.50 1611.50 9432.50
1946 1545.00 1460.50 859.50 660.00 432.50 168.50 43.50 106.84 c 279.11 b 403.00 f 837.00 f 1444.08 a 6999.53
1947 1491.00 1492.30 a 1338.00 847.50 534.75 a 197.50 51.00 40.00 256.50 312.50 1157.00 1455.50 9173.55
1948 1812.00 1536.00 1277.00 617.00 386.00 108.10 a 34.00 67.00 190.50 599.00 931.50 978.50 k 7558.10
1949 1487.00 1406.00 0.00 z 679.14 a 19.00 y 92.50 31.50 67.50 330.50 506.50 1000.00 1440.50 7041.14
1950 1737.00 1410.50 1398.00 1018.50 477.00 163.50 140.00 184.50 277.00 494.34 c 1152.50 1640.50 10093.34
1951 1711.00 1384.50 1321.00 785.00 261.00 176.50 61.00 132.50 336.50 586.50 1245.50 1521.50 9522.50
1952 1546.38 a 1308.00 1307.50 640.50 372.50 83.00 31.00 78.50 220.50 766.50 949.00 1264.00 8567.38
1953 1463.20 a 1390.50 1151.00 835.00 356.00 77.00 45.47 a 55.05 b 288.75 b 175.50 o 882.93 a 879.50 l 6544.90
1954 1303.50 g 1033.67 d 1287.05 c 677.78 c 539.50 95.19 d 43.00 l 116.25 a 296.00 655.00 933.50 1417.50 7051.44
1955 1694.50 1445.00 1361.50 521.50 278.00 127.00 9.30 a 44.43 a 274.14 a 541.00 1212.32 b 1626.00 9134.69
1956 1572.50 1530.79 a 1348.50 795.50 390.00 84.50 93.50 71.50 335.50 412.00 1018.50 1399.13 a 9051.92
1957 1815.00 1355.50 1235.00 703.50 384.00 122.50 22.00 103.50 340.50 618.50 1022.59 a 1433.50 9156.09
1958 1462.00 1487.00 1184.00 664.50 398.50 228.75 b 66.00 99.00 237.50 525.45 a 977.59 a 1761.32 a 9091.60
1959 1878.50 1535.00 1259.00 726.50 258.50 103.50 53.50 22.00 234.00 716.50 1295.00 1246.00 9328.00
1960 1573.00 1409.09 a 1533.00 697.50 383.50 151.00 65.00 46.00 260.00 574.53 a 921.50 1529.50 9143.62
1961 1658.00 1218.00 1092.00 805.86 a 455.00 106.00 40.50 46.00 271.03 a 531.00 1070.00 1509.50 8802.90
1962 1761.50 1519.00 1181.00 754.00 273.00 114.00 40.50 72.00 338.00 537.00 982.50 1524.00 9096.50
1963 1960.50 1625.50 1149.50 636.50 422.50 113.50 33.00 117.00 260.50 360.50 907.50 1754.00 9340.50
1964 1499.50 1438.00 1332.00 731.00 227.33 a 144.50 30.50 173.00 321.00 672.00 944.00 1651.00 9163.83
1965 1771.00 1556.00 1468.50 813.00 153.50 k 149.50 89.50 127.00 440.17 a 588.00 1053.00 1294.50 9350.17
1966 1195.50 m 1390.50 1111.50 840.00 537.50 117.00 24.00 137.50 262.00 625.00 1047.00 1472.50 7564.50
1967 1528.00 1611.00 1204.00 735.50 542.00 75.00 88.50 141.00 285.50 644.50 1134.00 1446.50 9435.50
1968 1663.00 1567.00 971.50 630.00 440.50 148.50 59.50 118.50 215.50 517.50 1013.50 1521.00 8866.00
1969 1660.50 1381.00 1390.50 632.50 332.00 276.50 54.50 17.00 253.00 681.00 1045.00 1473.50 9197.00
1970 1854.00 1473.00 1355.50 692.50 353.50 99.00 32.00 47.00 251.50 512.00 1051.50 1501.00 9222.50
1971 1883.00 1437.50 1354.00 754.50 474.50 81.50 78.50 116.00 243.50 396.00 1018.50 1458.00 9295.50
1972 1881.00 1644.50 1338.50 874.50 271.00 140.00 69.00 74.50 363.00 805.50 1099.00 1716.00 10276.50
1973 1643.50 1382.50 948.50 796.00 534.50 103.00 45.50 88.50 331.00 485.00 1038.50 1597.50 8994.00
1974 1778.00 1630.50 1279.50 790.00 524.00 235.50 37.50 119.50 485.50 699.50 998.50 1397.50 9975.50
1975 1644.00 1459.50 1426.50 964.50 301.50 157.50 57.00 108.50 428.00 607.00 937.00 1576.50 9667.50
1976 1868.50 1329.50 1344.50 680.50 488.50 85.00 40.50 142.50 415.00 858.00 1341.21 a 1886.50 10480.21
1977 2120.00 1437.50 1059.50 637.50 167.00 173.50 38.00 210.50 299.00 657.00 1065.00 1592.00 9456.50
1978 1832.00 1646.00 1378.00 819.00 358.00 182.00 105.50 81.50 258.50 661.50 1121.50 1709.50 10153.00
1979 2055.00 1710.50 1304.00 858.00 547.00 177.00 55.50 132.00 295.50 744.50 1083.50 1423.00 10385.50
1980 1764.50 1633.50 1410.00 712.00 303.00 187.50 52.50 80.50 280.00 n 806.00 1061.00 1642.50 9653.00
1981 1736.00 1355.00 1184.50 723.50 470.50 154.00 86.00 74.50 400.00 817.00 975.50 1556.50 9533.00
1982 2062.50 1583.00 1358.50 978.50 290.00 308.50 31.50 146.00 353.50 607.50 1093.50 1332.00 10145.00
1983 1570.00 1192.50 1164.50 880.50 592.50 181.50 27.50 30.00 282.50 642.00 413.00 p 263.50 z 6563.50
1984 1448.50 h 1232.50 1459.00 657.50 516.00 88.00 85.00 79.57 a 414.50 586.00 1105.50 1550.50 7774.07
1985 1812.50 1543.50 1108.50 686.50 325.50 158.50 k 131.50 178.50 383.00 344.00 q 1306.50 1930.00 9406.00
1986 1711.00 1549.50 1239.48 a 638.00 326.50 176.00 58.50 197.50 347.00 729.50 1260.00 1479.00 9711.98
1987 1563.50 1257.50 1092.00 667.50 415.50 154.00 98.00 194.00 261.00 816.00 964.50 1319.50 8803.00
1988 1831.00 1665.00 1271.00 745.00 291.50 97.00 20.50 71.50 287.50 837.00 1010.00 1538.63 a 9665.63
1989 1537.50 1697.50 1434.50 864.00 416.00 188.50 27.00 79.00 298.50 601.50 1214.50 1907.00 10265.50
1990 1431.50 1429.00 1146.00 692.00 487.00 140.50 58.50 29.50 s 217.50 m 713.50 946.00 1554.50 8598.50
1991 1819.00 1380.00 1227.50 691.50 302.00 0.00 z 62.50 53.50 367.00 709.50 1222.00 932.00 m 7834.50
1992 1523.50 1313.00 1263.50 874.50 368.00 224.48 a 139.50 166.50 354.00 681.00 1113.50 1475.50 9496.98
1993 1688.50 1449.00 805.50 m 900.00 433.00 199.00 45.00 75.50 478.50 756.50 1165.00 1446.00 8636.00
1994 2052.50 1606.50 762.50 k 813.00 405.00 109.50 63.50 120.00 203.50 306.50 m 935.00 1327.00 7635.50
1995 1583.00 1465.00 1163.50 949.00 440.50 76.00 48.50 14.50 346.50 609.50 740.50 n 1643.50 8339.50
1996 1861.00 1588.50 1505.50 993.50 511.00 127.50 100.00 52.50 288.00 628.00 1219.00 1531.50 10406.00
1997 1750.50 1366.81 a 866.00 l 866.00 604.00 75.50 80.00 154.00 242.00 616.00 1135.50 1282.50 8172.81
1998 1481.50 1017.50 841.00 l 591.50 193.50 173.00 21.00 15.50 156.50 566.00 933.50 1329.00 6478.50
1999 1769.50 1240.50 1203.00 642.00 284.00 134.00 20.00 92.50 307.50 696.00 837.50 1421.50 8648.00
2000 1696.50 1336.00 967.00 765.00 329.50 159.00 59.00 49.50 289.50 514.60 a 1018.50 1814.00 8998.10
2001 1511.50 1539.00 1294.25 a 698.00 306.50 139.00 54.50 36.00 271.50 638.00 738.50 1251.00 8477.75
2002 1365.50 1185.50 1438.50 820.00 544.50 101.00 10.00 32.00 204.50 774.00 698.50 l 1338.50 7814.00
2003 1675.50 1575.00 1263.50 793.50 409.00 151.50 33.00 20.00 247.00 629.00 1074.50 1349.00 9220.50
2004 1832.00 1422.00 1165.00 531.00 h 500.50 194.50 70.50 184.50 159.00 606.00 370.00 q 1492.50 7626.50
2005 1705.00 1271.50 1341.86 c 599.00 446.00 31.50 36.50 32.00 153.50 517.00 999.00 1484.00 8616.86
2006 1288.50 1466.50 700.00 l 566.00 359.00 70.50 6.00 25.50 312.00 760.50 956.50 1308.00 7119.00
2007 1532.50 1615.50 783.50 j 784.50 293.00 84.50 54.50 74.50 257.50 505.00 1059.00 1587.50 7848.00
2008 1636.50 1612.00 1422.50 817.50 516.50 125.50 23.00 68.00 222.00 643.50 1065.50 1728.50 9881.00
2009 1921.50 1368.50 1222.00 762.50 418.00 191.50 116.50 127.50 157.50 790.00 817.00 1575.50 9468.00
2010 1579.00 1372.50 701.00 j 525.00 318.50 120.00 4.50 39.00 366.50 558.50 1000.00 1541.14 c 7424.64
2011 191.50 z 115.50 z 169.50 z 146.50 y 440.50 147.00 12.50 38.23 a 311.38 a 537.50 937.78 c 1351.00 3775.89
2012 1501.00 1264.00 523.00 k 684.50 296.50 86.67 c 4.65 a 85.00 324.50 162.50 y 0.00 z 0.00 z 4246.82
Period of Record Statistics
MEAN 1686.10 1443.30 1258.14 752.92 393.05 138.77 51.31 90.11 291.80 623.41 1041.77 1505.68 9389.29
S.D. 174.26 146.86 150.56 111.65 104.44 52.48 31.38 49.37 73.30 112.17 119.01 155.21 520.39
SKEW 0.18 -0.35 -0.49 0.13 -0.03 0.77 0.81 0.51 0.31 -0.17 0.26 0.60 0.42
MAX 2120.00 1773.50 1533.00 1018.50 604.00 308.50 140.00 210.50 485.50 858.00 1341.21 1930.00 10480.21
MIN 1288.50 1017.50 859.50 521.50 167.00 31.50 3.00 14.50 149.48 312.50 738.50 1240.00 8477.75
NO YRS 73 77 68 77 77 76 78 77 76 73 73 73 49