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
1909 0.00 z 0.00 z 0.00 z 196.50 w 673.06 e 233.79 a 72.00 71.50 280.00 658.50 923.04 b 1546.68 c 4458.56
1910 1575.66 b 1552.25 d 909.69 b 745.50 567.50 179.46 b 58.50 67.00 277.76 a 539.40 a 1165.71 b 1606.00 9244.43
1911 1799.50 1308.46 b 1090.88 b 858.00 468.00 218.28 a 71.00 i 138.00 340.50 673.70 c 776.00 k 1311.09 b 8206.40
1912 2213.06 d 1606.28 b 1417.06 e 826.55 a 602.95 a 245.17 a 126.14 b 203.00 291.92 d 533.56 e 958.27 d 608.50 p 9023.95
1913 1781.98 a 1615.70 a 1484.00 761.25 b 613.05 b 214.00 151.38 a 92.50 f 317.59 a 528.00 h 866.50 1135.08 e 8940.54
1914 930.00 j 1728.00 1298.79 b 953.00 373.50 257.50 65.00 113.50 261.00 518.50 1024.00 1685.00 8277.79
1915 1697.00 1251.00 1222.00 623.00 656.00 330.56 c 172.50 160.50 280.50 642.00 1008.21 b 1402.23 a 9445.50
1916 1832.10 a 1643.16 a 1442.00 817.00 578.00 348.50 77.50 a 61.48 a 351.50 685.00 1039.50 1719.43 b 10595.17
1917 1911.00 1773.50 1314.00 969.00 643.00 419.00 114.00 164.00 339.50 921.00 908.50 1828.50 11305.00
1918 1943.70 a 1528.69 b 1042.12 a 912.50 561.50 225.50 108.50 69.00 442.50 609.50 897.00 1214.00 9554.51
1919 1417.00 1386.50 1234.83 a 795.52 a 513.50 297.50 58.00 47.53 a 219.00 h 793.50 1244.48 a 1726.59 c 9514.96
1920 1865.17 a 1485.00 1232.50 995.50 504.00 257.00 92.00 80.50 177.00 438.50 1058.50 1336.10 a 9521.77
1921 1434.00 1271.50 1210.00 719.50 518.50 168.00 11.37 a 79.05 a 209.50 587.50 1199.00 1483.00 8890.92
1922 1698.50 1560.50 1209.00 839.50 520.00 195.00 110.50 73.88 a 225.00 572.50 847.78 c 1571.00 9423.16
1923 1590.00 1641.50 1531.50 647.00 h 527.50 177.50 98.50 115.00 227.50 595.50 852.00 1188.50 8545.00
1924 1938.50 1313.00 1199.50 870.00 546.50 225.50 103.00 113.50 335.69 a 451.00 1044.00 1820.50 9960.69
1925 1637.32 a 1345.50 1196.50 716.50 522.50 196.00 61.00 32.00 222.00 882.98 a 1063.97 a 1541.00 9417.27
1926 1575.26 d 1315.50 1363.50 781.03 a 569.50 255.00 145.00 73.00 377.50 680.00 1179.00 1635.00 9949.29
1927 1694.50 1343.50 1049.00 793.50 651.00 267.00 102.50 146.00 239.50 576.00 1111.50 1797.50 9771.50
1928 1605.50 1426.00 1233.50 896.00 374.00 289.00 104.00 86.00 347.00 610.50 880.00 1302.00 a 9153.50
1929 2020.68 a 1618.50 1102.00 771.50 591.00 240.00 56.50 59.50 337.00 546.50 1127.50 1536.00 10006.68
1930 1884.28 a 1240.30 a 1211.00 755.00 522.50 83.50 57.50 33.50 267.00 722.50 973.97 a 1351.00 9102.04
1931 1351.50 1083.50 1150.50 681.50 466.55 a 249.83 a 34.62 a 97.50 185.00 395.50 830.50 0.00 z 6526.49
1932 1391.26 b 1466.05 a 1434.50 848.50 462.93 a 214.50 65.00 25.50 235.00 674.50 1102.50 1547.42 a 9467.66
1933 1430.65 a 1559.38 b 1240.50 830.50 538.00 107.50 68.00 56.00 169.50 705.00 1155.50 1628.50 9489.04
1934 1451.00 1529.50 1321.63 a 802.50 b 394.00 245.50 72.50 151.50 358.00 502.00 873.00 1583.14 b 9284.27
1935 1801.62 a 1198.00 1188.00 892.00 535.00 251.50 58.00 76.50 321.50 620.00 1155.00 1456.00 9553.12
1936 1837.50 1903.00 1197.00 906.50 459.50 215.00 66.00 61.00 205.50 738.50 1145.50 1401.41 b 10136.41
1937 1875.00 1455.50 1273.50 831.50 504.00 157.00 55.50 23.50 256.50 677.50 1065.00 1551.00 9725.50
1938 1666.00 1310.00 1009.05 a 767.50 557.00 154.29 b 101.00 18.50 198.50 469.50 1053.50 1428.00 8732.84
1939 1494.50 1578.08 c 1268.00 868.00 474.00 278.50 56.50 37.00 233.50 625.00 881.00 1132.50 8926.58
1940 1735.50 1285.00 1335.50 859.50 562.50 221.00 49.50 82.50 164.00 445.00 1066.50 1386.50 9193.00
1941 1523.50 1381.00 1243.00 665.50 375.50 252.00 27.00 67.50 221.00 535.00 940.00 1222.00 8453.00
1942 1436.00 1310.50 1016.00 630.50 528.00 277.50 72.50 60.00 305.00 578.00 1011.21 a 1570.00 8795.21
1943 1774.00 1375.50 1443.00 783.00 469.50 258.50 11.50 39.00 364.50 556.00 1110.00 1400.50 9585.00
1944 1277.00 1412.00 1270.50 858.00 499.00 236.50 47.50 46.50 237.50 526.50 832.76 a 1462.50 8706.26
1945 1637.50 1355.00 955.00 820.50 583.00 285.50 53.00 39.00 312.50 612.00 1046.00 1563.00 9262.00
1946 1565.50 a 1462.50 931.50 654.50 545.00 212.00 28.50 71.50 277.50 564.00 1003.00 949.00 j 7315.50
1947 1234.50 f 1461.92 b 1171.36 c 841.55 a 463.00 g 0.00 z 42.00 52.50 190.00 f 333.50 1154.50 1429.10 a 6486.43
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 160.50 75.00 50.00 182.50 540.00 944.00 1445.00 3397.00
1949 1521.00 1473.00 1231.00 591.50 416.50 98.79 a 40.50 40.00 319.50 563.50 916.00 1485.50 8696.79
1950 1876.00 1405.50 1411.00 997.00 614.00 205.50 156.50 225.50 279.50 558.00 1172.00 1687.50 10588.00
1951 1767.00 1375.00 1349.53 a 760.34 a 354.50 232.00 65.00 145.00 352.00 635.00 1236.50 1566.00 9837.88
1952 1679.17 a 1250.22 b 1250.00 580.50 312.00 g 147.00 36.88 b 66.50 234.50 687.17 a 948.00 1259.00 8138.93
1953 1532.50 1349.00 1141.50 809.50 493.93 a 190.86 a 41.50 46.50 271.20 e 446.40 a 860.00 1399.00 8581.90
1954 1753.00 1036.00 1227.00 754.50 594.68 a 159.00 61.50 67.00 273.50 643.00 881.50 1310.00 8760.68
1955 1631.52 d 1443.00 1419.50 574.50 397.83 a 139.00 30.48 a 14.50 257.50 541.00 1206.50 1632.00 9287.34
1956 1570.00 1488.00 1317.50 858.75 b 483.00 223.00 153.00 112.50 353.50 415.00 1010.00 1420.32 a 9404.57
1957 1852.50 1456.52 a 1287.00 743.50 488.00 253.00 45.00 54.77 a 311.00 634.00 987.00 1366.00 9478.29
1958 1448.00 1495.00 1155.50 718.97 a 414.37 a 299.00 101.00 111.00 225.00 544.50 969.00 1717.40 a 9198.73
1959 1876.50 1479.50 1148.50 726.50 411.00 160.00 43.40 a 38.50 244.00 689.50 1274.00 1186.00 9277.40
1960 1602.50 1451.50 1462.50 722.50 554.00 199.00 57.00 37.00 259.50 566.50 920.50 1526.00 9358.50
1961 1688.00 1196.50 1019.50 840.50 477.50 188.00 55.00 20.00 287.00 524.50 978.50 1519.50 8794.50
1962 1800.50 1497.00 1219.16 b 840.50 500.00 300.00 113.50 101.00 308.50 534.00 873.00 1464.00 9551.16
1963 1889.50 1559.00 1122.50 727.00 466.50 212.50 26.50 111.00 214.00 339.50 861.50 1670.50 9200.00
1964 1421.00 1342.50 1271.00 822.00 373.50 279.50 55.00 167.50 0.00 z 566.50 971.00 1659.00 8928.50
1965 1787.00 1569.50 1456.00 773.50 462.79 c 284.00 163.50 128.00 431.50 563.50 1034.00 1259.00 9912.29
1966 1954.00 0.00 z 1122.50 861.50 527.50 172.00 34.50 90.50 296.50 614.83 a 1112.00 1497.50 8283.33
1967 1568.60 a 1662.23 b 1157.85 a 782.00 568.00 0.00 z 0.00 z 49.50 t 212.00 568.50 1040.50 1392.50 8952.18
1968 1611.00 1479.50 932.50 638.00 537.00 254.00 66.00 0.00 z 199.50 481.50 937.50 1473.50 8610.00
1969 1668.50 1327.50 1227.00 743.50 445.00 343.50 128.00 6.00 203.00 715.50 1011.00 1334.50 9153.00
1970 1844.00 1452.50 0.00 z 821.00 607.00 230.50 38.50 41.50 283.00 613.00 1022.50 1545.50 8499.00
1971 1871.50 1451.00 1250.50 782.00 574.00 249.00 99.50 119.50 259.00 467.00 986.00 1501.50 9610.50
1972 1906.50 1627.50 1423.50 942.50 586.00 292.50 141.50 138.50 327.50 724.50 1022.00 1675.50 10808.00
1973 1575.50 1342.00 1010.50 774.50 607.00 234.50 44.00 56.00 275.00 476.50 967.50 1508.00 8871.00
1974 1708.50 883.00 l 1303.50 865.50 627.50 216.00 70.00 120.50 406.50 658.00 953.00 1265.50 8194.50
1975 1589.00 1373.50 1329.50 939.00 396.00 257.00 21.00 77.50 323.50 555.00 898.00 1544.00 9303.00
1976 1751.50 1196.50 0.00 z 664.50 457.00 165.50 28.00 81.00 265.50 770.50 1175.50 1820.00 8375.50
1977 1986.50 1287.00 1062.50 760.00 426.50 274.29 b 77.50 176.50 372.00 607.50 1078.50 1582.50 9691.29
1978 1809.22 b 1507.00 1222.50 868.00 516.50 199.50 99.95 b 109.02 a 223.50 550.50 1107.50 1666.50 9879.69
1979 1993.00 1729.50 1296.00 927.50 629.00 270.50 98.00 131.50 225.00 679.00 1035.00 1283.50 10297.50
1980 1649.72 a 1473.00 1320.50 738.50 396.50 210.00 30.50 80.00 312.50 710.00 987.00 1567.00 9475.22
1981 1567.50 1338.00 1061.50 760.00 527.00 248.00 0.00 z 0.00 z 265.00 637.00 821.00 1448.00 8673.00
1982 2015.00 1438.00 1236.50 844.00 570.00 284.00 25.00 f 139.50 254.00 579.00 1118.50 1337.00 9815.50
1983 1519.50 1153.00 1172.00 839.50 608.00 309.50 34.00 9.00 295.50 606.50 1008.00 1916.00 9470.50
1984 1711.50 1155.50 1372.50 801.00 517.00 267.00 36.50 58.50 341.50 627.23 a 1040.50 1540.50 9469.23
1985 1708.00 1406.00 981.50 578.50 h 309.00 f 269.00 59.50 168.50 335.50 625.50 1235.00 1833.13 a 8621.63
1986 1577.50 1453.50 1094.50 755.89 b 513.50 206.50 90.50 90.00 315.00 588.00 1113.50 1336.50 9134.89
1987 1468.00 1089.50 1023.52 a 579.83 a 468.00 132.00 36.50 62.50 169.00 705.00 904.50 1261.50 7899.84
1988 1754.00 1589.50 1148.00 733.00 427.00 121.03 a 23.50 70.78 a 232.50 726.00 979.50 1474.50 9279.32
1989 1478.00 1641.00 1370.50 821.50 498.50 266.00 46.50 52.50 223.50 615.00 1147.00 1777.00 9937.00
1990 1335.00 1318.00 1136.00 766.00 578.50 140.00 0.00 z 69.50 184.50 640.50 911.00 1471.50 8550.50
1991 1725.50 1243.50 1194.00 759.00 503.00 255.50 73.00 39.50 285.00 658.00 1237.00 1454.50 9427.50
1992 1449.00 1194.50 1166.00 832.00 348.00 290.50 125.00 109.00 268.00 648.50 1049.50 1414.50 8894.50
1993 1574.50 1338.00 1181.00 856.50 458.50 284.00 82.00 60.50 407.00 719.00 1119.00 1400.00 9480.00
1994 1984.50 1587.50 1059.50 715.00 371.00 161.50 72.50 99.50 177.00 511.50 879.00 1291.50 8910.00
1995 1494.00 1415.00 1156.50 917.00 440.50 195.00 73.00 31.00 281.00 595.00 1255.00 1577.50 9430.50
1996 1851.22 a 1488.50 1370.00 888.00 584.50 0.00 z 127.50 42.50 231.50 575.50 1190.50 1563.00 9912.72
1997 1697.00 1324.00 1227.50 848.00 603.50 127.00 102.00 104.00 169.00 577.00 1055.00 1160.00 8994.00
1998 1382.00 959.00 1109.00 624.50 333.00 218.50 25.32 a 5.50 118.00 468.50 841.50 1311.00 7395.82
1999 1637.50 1151.50 1039.00 703.50 429.57 c 160.00 36.17 a 43.29 b 0.00 z 328.00 q 811.67 c 1292.00 7304.20
2000 1548.00 1176.50 929.50 777.50 402.50 215.50 82.50 9.00 224.50 505.50 960.50 1741.88 b 8573.38
2001 1370.50 1469.50 1131.50 720.50 405.50 182.00 54.77 a 25.50 241.50 583.00 687.86 b 1203.00 8075.12
2002 1342.50 1113.50 1333.00 754.00 542.50 213.50 15.50 51.50 212.00 772.00 1052.50 1275.00 8677.50
2003 1602.00 1469.00 1231.50 792.50 530.00 244.00 34.50 12.50 f 217.50 559.00 1013.00 1257.00 8950.00
2004 1763.50 1267.00 1038.50 714.50 588.00 201.50 69.50 134.50 161.50 530.00 842.50 1445.00 8756.00
2005 1653.50 1157.50 1182.00 656.25 b 553.50 219.00 44.50 81.50 132.50 515.50 919.50 1334.00 8449.25
2006 1155.50 1318.07 a 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 8.50 243.50 0.00 z 905.50 1166.50 4797.57
2007 1429.50 1467.50 1057.50 0.00 z 0.00 z 159.00 44.50 0.00 z 198.00 471.50 950.50 1503.50 7281.50
2008 0.00 z 38.50 z 1211.00 767.00 497.50 164.50 60.50 39.50 0.00 z 547.50 993.50 1641.45 a 5922.45
2009 1828.50 1376.00 1202.50 731.50 434.00 208.00 0.00 z 110.00 105.00 696.00 757.00 1472.00 8920.50
2010 1555.50 1261.50 865.50 0.00 z 426.00 194.00 3.50 50.00 329.50 516.50 954.00 1488.00 7644.00
2011 1670.50 1301.50 1153.50 753.00 580.00 350.19 d 30.50 12.50 275.50 525.50 890.50 1221.00 8764.19
2012 1046.00 f 1119.00 864.38 a 710.00 381.50 124.50 21.50 0.00 z 129.00 t 0.00 z 0.00 z 0.00 z 3220.88
Period of Record Statistics
MEAN 1667.29 1400.37 1200.90 786.72 505.85 224.50 68.62 77.68 266.06 593.04 1008.02 1473.35 9315.10
S.D. 194.80 170.45 145.52 92.08 80.50 59.59 37.81 46.74 67.97 101.46 122.70 178.41 636.80
SKEW 0.04 0.05 -0.11 -0.13 -0.15 0.17 0.77 0.75 0.18 0.28 0.12 0.18 0.16
MAX 2213.06 1903.00 1531.50 997.00 673.06 419.00 172.50 225.50 442.50 921.00 1274.00 1916.00 11305.00
MIN 1155.50 959.00 864.38 574.50 333.00 83.50 3.50 5.50 105.00 333.50 687.86 1132.50 7395.82
NO YRS 98 99 99 97 98 100 97 97 98 100 102 100 72