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
1893 833.00 p 1393.50 977.50 g 775.86 a 304.50 h 31.55 a 13.50 73.00 259.00 530.00 946.50 1452.50 5475.41
1894 1430.50 1321.50 895.56 d 590.69 a 379.23 a 79.00 16.50 88.35 a 153.00 518.73 a 1053.00 1110.32 a 7636.38
1895 1577.12 c 1083.00 f 1193.00 622.50 318.27 a 67.00 64.00 46.00 171.00 716.10 a 994.66 a 1258.00 7027.65
1896 1390.50 1218.00 1208.00 558.50 166.50 56.50 27.50 50.50 289.50 634.39 c 1039.50 1211.50 7850.89
1897 1388.80 a 1159.85 b 1175.00 704.46 b 400.00 171.00 5.68 a 65.00 125.00 c 430.38 a 449.50 n 1419.00 7044.18
1898 1326.50 1177.50 950.48 c 645.50 296.88 e 58.97 a 30.50 55.80 a 133.97 a 501.74 d 911.38 a 1430.00 7519.22
1899 1559.00 1566.78 e 1030.00 g 553.39 b 313.50 53.00 1.50 20.50 282.00 402.50 695.77 d 1334.79 e 6782.73
1900 1285.50 1430.50 1243.50 576.50 293.50 91.50 21.04 c 2.00 145.50 254.50 982.50 1180.67 b 7507.21
1901 1425.50 1436.30 a 1159.00 558.00 320.50 75.00 0.00 6.50 208.85 d 436.07 a 931.50 1383.78 b 7940.98
1902 1405.69 b 1262.59 a 797.39 d 600.58 d 299.27 e 115.71 b 6.09 c 41.73 e 212.50 545.37 d 421.00 i 776.00 l 5286.92
1903 833.00 m 0.00 z 823.10 b 655.56 c 320.16 b 111.50 18.50 87.83 a 210.50 515.00 1011.00 1554.50 5307.65
1904 1709.65 a 1704.56 b 1140.00 784.50 305.00 80.50 44.90 b 81.00 207.00 555.00 842.00 1410.00 8864.10
1905 1673.50 1478.50 1070.00 676.50 413.00 107.50 30.50 33.50 113.00 558.00 930.00 1192.00 8276.00
1906 1211.14 b 1310.50 1326.00 579.00 352.50 77.50 18.50 26.00 92.00 544.50 887.00 1258.60 a 7683.24
1907 1518.40 e 0.00 z 993.00 906.50 545.50 103.50 11.88 a 59.00 216.21 a 572.47 a 923.50 1240.50 7090.46
1908 1350.00 1307.50 1062.00 624.50 293.00 100.00 21.50 45.00 109.50 437.50 868.00 827.00 l 6218.50
1909 1380.57 b 1191.50 1115.00 823.97 a 379.23 a 78.50 19.00 21.00 208.00 609.00 732.50 1424.50 7982.77
1910 1442.53 a 1379.50 752.00 584.50 447.00 112.50 11.00 26.02 c 199.00 413.50 1024.29 b 1413.00 7804.84
1911 1469.50 1173.31 b 1009.00 656.50 237.50 25.50 30.00 59.86 b 195.52 a 564.00 1085.00 1151.50 7657.19
1912 2010.35 a 1477.00 1284.50 655.86 a 343.00 120.50 45.47 a 89.79 b 193.00 405.14 b 866.50 1190.50 8681.61
1913 1422.50 1452.50 1206.00 641.50 365.50 84.00 27.00 42.88 a 205.34 a 528.00 775.00 1029.50 7779.73
1914 1290.00 1498.50 1183.00 817.76 a 274.19 b 122.59 a 3.74 b 62.52 a 163.93 b 335.32 a 835.00 1446.50 8033.04
1915 1533.47 a 1081.23 b 1127.50 458.00 452.50 173.50 61.50 132.94 e 157.00 460.50 792.86 b 1246.00 7677.00
1916 1386.73 a 1437.00 1320.50 671.50 330.00 139.50 5.00 40.09 b 243.00 508.00 933.62 a 1467.33 a 8482.27
1917 1610.50 1580.50 1163.00 771.00 484.00 161.50 11.62 c 68.50 164.50 740.50 182.50 x 1522.10 a 8277.72
1918 1768.50 1316.52 a 720.50 f 770.36 b 305.98 d 80.50 54.25 a 31.50 369.50 507.50 829.00 0.00 z 6033.61
1919 1304.50 1207.50 1041.00 652.50 358.50 i 9.60 e 0.00 0.00 z 58.50 524.50 1037.14 b 1694.00 7529.24
1920 0.00 z 0.00 z 0.00 z 772.50 d 351.00 63.50 56.50 42.22 b 121.00 313.50 678.00 h 1215.50 2935.72
1921 1308.72 a 1173.50 993.55 a 502.00 328.50 54.50 1.00 25.00 73.00 491.72 b 1028.00 1378.00 7357.49
1922 1613.00 1389.50 1104.00 683.65 d 0.00 z 49.80 e 20.15 a 53.98 b 155.00 f 506.50 777.50 1439.00 7637.09
1923 1448.50 1509.50 1361.50 779.46 b 379.50 9.00 h 0.00 a 89.50 179.50 557.50 781.00 1044.50 8130.46
1924 1768.50 1319.00 1107.50 735.50 533.72 a 125.00 i 64.50 52.00 271.61 b 355.50 892.22 c 1600.00 8700.05
1925 1510.50 1218.00 a 1041.50 549.50 443.00 94.66 a 38.50 19.50 176.79 b 847.52 c 990.00 1458.00 8387.46
1926 1484.50 1285.50 1326.50 813.00 336.50 172.00 23.00 25.50 266.00 613.50 1067.00 1501.50 8914.50
1927 1615.00 1182.50 940.00 700.00 433.48 a 151.50 40.00 81.00 189.50 488.50 954.00 1579.00 8354.48
1928 1446.00 1375.00 1180.00 880.00 331.50 167.00 22.00 43.50 299.00 504.00 912.50 1286.00 8446.50
1929 1922.00 1601.50 1039.00 656.00 453.00 165.50 21.00 74.00 226.00 532.50 1067.00 1358.00 9115.50
1930 1705.00 1184.81 a 1119.50 662.00 307.50 43.93 b 19.50 23.52 b 166.55 a 560.50 851.00 1301.50 7945.31
1931 1314.92 a 1032.50 1072.50 628.50 380.00 63.00 6.50 46.00 90.50 361.00 690.00 1076.00 6761.42
1932 1226.57 a 1280.50 1264.50 734.50 323.50 24.00 28.00 15.50 b 168.00 588.50 1059.50 1385.50 8098.57
1933 1235.00 1372.50 1136.50 714.00 280.00 6.00 e 9.00 36.34 b 96.50 594.50 1053.00 1458.00 7991.34
1934 1303.50 1468.00 1233.50 698.50 216.00 45.00 30.48 a 138.00 216.50 499.62 a 568.50 h 1359.00 7208.10
1935 1586.00 1228.00 1018.00 694.50 447.50 137.00 1.00 52.00 232.00 539.00 955.34 a 1329.00 8219.34
1936 1638.50 1762.00 1089.00 797.50 217.00 146.38 a 7.00 21.00 150.00 616.00 1056.00 1235.00 8735.38
1937 1556.20 a 1256.50 1165.50 708.00 318.00 92.00 20.50 12.00 254.50 631.50 971.00 1396.50 8382.20
1938 1573.50 1178.50 953.50 588.00 337.00 88.00 16.50 26.50 229.50 390.00 868.50 1303.50 7553.00
1939 1348.50 1428.50 1154.50 744.00 308.00 67.50 32.00 28.00 227.50 567.50 900.50 1099.50 7906.00
1940 1644.03 a 1315.20 b 1218.50 769.50 421.50 103.00 51.50 87.50 194.00 494.00 1005.00 1305.50 8609.24
1941 1421.00 1291.50 1296.50 547.50 254.00 94.00 36.50 61.00 150.00 495.00 803.00 1088.00 7538.00
1942 1422.90 a 1248.00 965.00 471.00 369.00 94.50 32.55 a 55.50 262.00 507.50 912.00 1433.50 7773.45
1943 1577.50 1283.00 1291.50 739.00 291.50 g 83.50 3.00 30.00 314.00 506.50 993.00 1285.00 8106.00
1944 1184.00 1241.50 1184.00 747.00 232.50 66.50 6.00 53.00 180.00 530.00 756.50 1416.50 7597.50
1945 1569.00 1208.50 775.50 562.50 418.50 165.50 24.00 30.50 214.50 555.50 910.00 1437.00 7871.00
1946 1381.00 1256.00 767.00 536.00 355.50 133.50 8.50 70.27 a 173.00 393.50 825.54 b 1246.72 a 7146.52
1947 1309.50 1306.00 1055.50 669.31 a 0.00 z 88.00 j 24.00 0.00 181.50 0.00 z 977.50 1322.67 a 6845.98
1948 1638.00 1378.50 1121.50 552.50 333.50 68.00 9.82 a 14.50 115.00 489.69 d 417.50 k 0.00 z 5721.00
1949 61.00 z 454.50 p 1060.00 565.18 b 270.00 40.34 a 2.07 a 20.00 224.00 387.50 917.00 1297.87 a 4783.96
1950 1461.00 1269.85 a 1221.83 b 833.28 a 344.00 59.50 36.17 d 126.00 210.56 c 397.50 996.50 1454.50 8410.68
1951 1519.00 1244.50 1112.50 647.00 175.50 96.00 19.50 64.00 233.00 455.00 1091.90 a 1264.69 d 7922.58
1952 1399.65 a 1155.00 1137.00 495.50 291.00 42.50 7.00 27.00 174.00 636.00 803.04 b 1141.00 7308.69
1953 1294.50 1213.50 996.50 708.50 328.00 45.50 14.00 6.00 177.50 362.18 a 711.43 b 1200.50 7058.11
1954 1493.00 1009.00 1122.95 b 590.50 461.00 69.50 18.00 53.50 190.50 504.50 809.00 1246.00 7567.45
1955 1475.08 a 1281.00 1141.00 451.00 193.00 54.50 5.50 12.00 148.00 433.00 984.50 1118.00 g 6178.58
1956 1052.50 h 1303.50 1213.00 745.86 a 346.00 75.00 22.50 29.50 248.50 306.90 a 876.43 b 1247.46 d 6414.65
1957 1634.50 1210.50 1029.31 d 598.00 329.50 60.50 10.50 29.50 220.50 533.50 872.50 1217.50 7746.31
1958 1322.50 1321.00 1009.57 a 631.00 338.50 146.00 10.50 36.68 a 172.50 b 447.50 828.00 1507.00 7770.75
1959 1667.50 1420.50 1186.00 640.18 b 178.77 a 44.50 19.00 4.65 a 159.50 582.50 1096.50 1123.00 8122.60
1960 1347.50 1241.00 1333.00 607.50 358.50 73.50 38.20 c 16.50 157.50 489.00 768.50 1352.50 7783.20
1961 1487.00 1076.00 974.00 713.00 360.00 67.50 16.50 20.50 169.00 440.50 866.00 1366.00 7556.00
1962 1606.00 1360.00 1130.50 657.00 229.92 a 99.50 24.00 29.50 237.00 432.00 861.50 1328.00 7994.92
1963 1733.50 1464.00 1096.50 569.00 356.00 52.00 0.00 s 45.50 158.00 243.00 734.50 1478.50 7930.50
1964 1305.00 0.00 z 1090.00 610.00 191.50 109.00 14.97 b 77.50 212.50 519.50 769.00 1365.50 6264.47
1965 1481.50 1305.50 1226.00 735.00 247.00 110.50 37.50 52.50 242.00 452.00 864.50 1085.50 7839.50
1966 1606.50 1206.00 965.00 710.50 423.00 71.00 11.88 a 45.50 193.00 469.50 906.50 1292.00 7900.38
1967 1369.00 1407.50 1122.00 372.50 j 463.00 40.00 49.50 81.00 210.00 522.00 984.00 1279.50 7527.50
1968 1458.50 1373.50 892.00 576.00 367.00 93.00 40.50 76.50 124.00 435.50 0.00 z 0.00 z 5436.50
1969 0.00 z 0.00 z 1237.13 d 674.00 405.00 262.00 43.00 18.00 236.00 689.50 1050.52 a 1376.40 a 5991.55
1970 1781.00 1419.50 1209.00 647.50 378.50 66.00 11.50 20.00 196.00 474.00 940.50 1356.00 8499.50
1971 1748.50 1376.00 1271.00 711.50 394.50 55.00 42.50 68.50 173.50 368.00 931.00 1286.00 8426.00
1972 1739.50 1503.00 1297.00 834.00 267.00 132.41 a 55.00 68.50 285.50 665.00 932.50 1486.50 9265.91
1973 866.50 j 1235.00 860.00 524.00 j 455.50 39.50 1.00 40.50 234.50 375.00 933.00 1375.00 5549.00
1974 1534.50 1400.00 1150.50 666.00 460.50 158.50 15.50 41.50 363.50 616.50 894.00 1265.50 8566.50
1975 1437.50 1334.00 1292.00 873.50 243.50 94.50 26.00 41.00 335.50 487.00 770.50 1353.00 8288.00
1976 1646.50 1196.00 1122.50 610.50 429.00 41.38 a 7.50 81.50 301.50 706.50 1124.00 1697.50 8964.38
1977 1862.50 1298.00 940.50 577.00 173.50 130.50 16.50 87.50 204.50 563.00 939.50 1423.00 8216.00
1978 1598.50 1456.50 1199.00 752.00 313.00 133.97 a 48.00 33.00 176.38 a 593.50 943.00 1455.50 8702.34
1979 1819.00 1591.00 1183.50 734.50 453.50 101.00 26.50 64.50 199.66 a 615.50 944.50 1204.00 8937.16
1980 1434.27 a 1375.50 1217.00 618.21 b 261.50 167.00 17.50 21.00 254.50 703.50 964.50 1478.00 8512.48
1981 1615.50 1244.00 998.00 632.00 433.00 83.50 40.50 33.50 271.50 704.50 878.50 1345.00 8279.50
1982 1832.50 1416.00 1211.50 807.00 205.00 211.50 15.00 103.00 289.00 490.50 963.50 1159.00 8703.50
1983 1388.50 1121.50 1067.50 749.00 537.50 124.00 15.00 8.00 209.50 498.00 844.50 1680.00 8243.00
1984 1622.00 1092.50 1264.00 620.00 425.50 39.50 20.50 21.00 248.00 450.00 897.50 1298.00 7998.50
1985 1623.50 1380.00 1000.00 600.50 228.00 132.00 23.00 59.50 228.50 559.00 1049.00 1697.50 8580.50
1986 1525.50 1357.50 1080.50 545.00 271.50 120.00 24.50 97.50 233.50 589.50 1083.50 1284.50 8213.00
1987 1365.00 1129.50 973.50 575.00 319.00 57.50 37.50 77.50 196.00 732.00 859.00 1206.00 7527.50
1988 1700.00 1515.50 1129.00 0.00 z 278.50 88.00 17.00 56.00 204.00 746.50 0.00 z 1408.50 7143.00
1989 1375.00 1474.00 1322.50 758.50 0.00 z 133.97 a 21.50 0.00 z 243.50 488.00 1029.50 1742.00 8588.46
1990 1279.00 0.00 z 1042.50 601.50 0.00 z 109.50 0.00 z 80.00 241.50 635.00 821.00 1386.73 a 6196.73
1991 1653.50 1226.50 1059.00 583.50 279.50 50.00 51.00 29.50 308.50 601.50 1098.00 1337.50 8278.00
1992 1371.00 1179.50 1143.50 779.50 350.00 173.50 99.00 127.50 284.00 615.50 1002.50 1320.50 8446.00
1993 1502.98 a 1350.50 1116.00 814.50 352.00 157.50 8.50 37.00 357.93 a 665.50 994.50 1297.00 8653.91
1994 1858.50 1482.00 1069.00 671.00 346.50 86.00 38.50 89.50 156.00 507.50 823.00 1167.00 8294.50
1995 1424.00 1309.00 1039.00 834.00 379.50 71.50 29.50 2.00 284.50 518.00 1176.21 a 1521.50 8588.71
1996 1636.00 1465.00 1284.50 817.00 476.00 110.00 53.50 27.50 222.00 579.50 1100.00 1368.50 9139.50
1997 1622.33 a 1245.50 1169.50 733.00 529.50 94.00 54.50 96.50 178.00 573.00 1014.00 1163.50 8473.33
1998 1404.00 961.00 1036.00 588.50 182.50 125.00 12.50 13.50 118.00 485.50 796.00 1173.00 6895.50
1999 1607.00 1067.50 986.50 572.50 251.00 102.50 13.50 55.50 244.50 609.50 743.00 1311.00 7564.00
2000 1519.00 1209.50 815.00 696.00 303.50 109.00 58.00 34.50 264.50 465.00 929.50 1658.00 8061.50
2001 1379.00 1347.00 1146.50 566.38 a 257.50 118.50 27.50 6.50 246.00 565.50 676.00 1118.00 7454.38
2002 1258.50 1106.00 1231.00 673.00 477.50 85.00 6.50 15.50 131.50 657.50 954.50 1234.50 7831.00
2003 1536.50 1446.00 1140.50 746.50 376.00 114.50 19.00 13.00 205.50 576.00 913.00 1190.50 8277.00
2004 1653.50 1304.00 998.00 646.00 417.00 137.50 48.50 115.00 92.00 519.00 828.00 1350.00 8108.50
2005 1556.50 1121.00 1227.00 585.50 407.50 26.00 16.50 22.00 122.50 460.00 901.50 1402.00 7848.00
2006 1141.00 1313.50 1028.00 504.50 300.00 74.00 7.00 18.00 246.50 658.00 795.50 1140.00 7226.00
2007 1315.50 1452.00 980.00 653.00 249.50 51.50 33.00 26.00 161.50 379.50 951.50 1425.50 7678.50
2008 0.00 z 1510.00 1256.00 633.50 424.50 70.00 9.00 36.00 169.00 553.00 902.00 1567.50 7130.50
2009 1775.00 1245.50 1122.50 687.50 330.50 133.50 58.50 69.50 147.00 671.50 725.50 1416.00 8382.50
2010 1435.00 1168.00 881.50 497.50 257.50 75.50 3.00 15.00 264.00 490.50 867.00 1393.00 7347.50
2011 1565.50 1296.00 1156.50 753.50 372.00 104.50 3.00 11.00 263.00 481.00 828.50 1196.50 8031.00
2012 1320.00 1084.91 a 642.50 640.50 207.00 88.20 e 4.00 31.00 d 253.00 421.00 h 0.00 z 0.00 z 4271.11
Period of Record Statistics
MEAN 1506.66 1312.53 1102.31 665.81 340.32 94.16 23.99 46.87 205.13 522.96 914.76 1339.12 8063.96
S.D. 171.93 145.46 140.41 97.57 87.14 44.09 18.12 30.68 61.33 105.97 108.36 150.34 521.85
SKEW 0.38 0.28 -0.66 0.15 0.13 0.70 1.06 0.81 0.18 0.08 -0.04 0.38 -0.01
MAX 2010.35 1762.00 1361.50 906.50 545.50 262.00 99.00 138.00 369.50 847.52 1176.21 1742.00 9265.91
MIN 1141.00 961.00 642.50 451.00 166.50 6.00 0.00 0.00 58.50 243.00 676.00 1029.50 6761.42
NO YRS 112 112 116 117 113 117 118 118 119 118 111 113 87