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 436.00 x 1583.56 a 1223.50 694.50 378.00 26.50 10.50 75.00 221.00 488.00 1000.00 1581.00 7281.56
1894 1529.50 1396.00 899.00 512.50 247.00 43.00 12.50 31.00 121.00 512.00 1118.50 1171.00 7593.00
1895 1702.50 1528.00 1149.00 483.50 265.00 32.50 22.50 20.50 127.50 430.00 l 1004.50 1335.21 c 7670.71
1896 1467.50 1310.50 1244.50 491.00 115.00 32.50 20.67 a 51.50 292.00 658.50 1138.50 1300.50 8122.67
1897 1514.00 1240.50 1232.00 624.50 339.00 145.86 a 3.00 86.00 121.50 442.02 b 1075.86 a 1522.10 a 8346.34
1898 1399.13 a 1265.50 977.50 654.83 a 251.21 b 37.80 e 17.50 47.00 169.50 652.03 a 1020.52 a 1594.84 c 8087.36
1899 1730.83 d 1641.50 1464.20 c 550.34 a 287.78 a 38.00 8.27 a 19.63 a 310.50 431.23 c 760.80 e 1428.50 8671.59
1900 1355.50 1563.33 d 1267.00 551.25 b 181.57 c 72.41 a 24.28 a 1.19 e 198.50 273.50 789.50 h 900.00 j 5488.54
1901 932.50 l 392.00 u 398.00 u 331.50 h 189.00 88.97 a 7.48 b 16.53 a 159.50 g 481.69 e 813.00 f 1506.94 d 2290.62
1902 1164.00 g 1434.72 c 895.00 612.00 258.85 a 128.57 b 16.00 45.39 c 250.86 a 534.75 a 612.00 f 1446.00 5622.15
1903 1586.50 1390.00 871.50 590.56 c 257.00 125.50 h 34.00 99.50 214.82 b 406.50 g 1073.79 a 1663.00 7780.67
1904 1818.15 a 1742.50 932.50 f 752.07 a 267.78 b 69.00 39.50 69.75 a 130.50 309.50 i 813.10 a 1399.50 7101.85
1905 1767.00 1532.46 b 997.50 625.00 c 221.00 l 94.66 a 32.50 29.40 b 130.00 c 619.47 b 924.00 1266.50 8018.48
1906 1388.59 b 1408.50 1364.00 d 538.80 e 353.83 b 0.00 z 33.77 c 28.00 129.83 a 585.79 b 961.00 1415.84 b 8207.95
1907 1732.90 a 1347.00 989.42 a 867.00 519.50 102.00 k 7.00 j 0.00 z 0.00 z 460.50 g 981.72 a 1326.00 7763.54
1908 1446.50 1334.00 1067.00 609.00 300.59 c 92.31 d 29.50 71.00 127.50 d 462.93 a 921.35 d 865.00 m 6461.68
1909 465.00 w 1239.26 a 1187.82 a 827.59 a 358.10 b 0.00 z 0.00 z 22.06 e 238.27 d 639.50 596.50 i 1537.82 c 6050.41
1910 1580.50 1468.38 b 588.50 f 489.00 333.50 i 80.36 b 3.50 f 27.00 n 214.44 c 366.50 f 1129.20 e 1531.00 6492.89
1911 1576.50 1196.00 488.50 q 642.22 c 191.54 c 22.22 c 32.07 b 60.40 b 162.12 d 108.50 y 0.00 z 0.00 z 3883.06
1912 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 181.50 p 447.84 c 829.50 1226.50 2503.84
1913 1489.50 1461.00 1182.50 527.00 322.00 68.00 16.53 a 8.27 a 230.50 562.00 819.50 1109.50 7796.30
1914 1305.32 c 1566.96 a 1111.50 670.50 211.00 67.00 1.50 39.50 176.00 330.50 916.50 1597.00 7993.28
1915 1597.00 1104.50 1137.00 318.00 334.50 20.50 t 37.56 e 111.00 131.00 470.50 879.50 1314.29 b 7434.85
1916 1503.50 a 1463.50 1197.50 594.50 268.50 123.50 0.00 48.29 e 228.00 503.50 970.50 1562.50 8463.79
1917 1696.50 1667.04 a 0.00 z 681.72 a 445.88 a 140.50 30.50 49.50 215.00 827.00 878.50 1612.50 8244.64
1918 1867.00 1355.41 a 874.20 a 685.00 179.50 38.00 34.50 10.00 341.00 472.00 834.83 a 1173.50 7864.94
1919 1320.50 1249.00 1025.00 582.50 345.00 22.00 1.00 31.50 112.00 525.00 1034.50 1687.50 7935.50
1920 1762.00 1437.00 1052.00 771.50 295.00 55.00 17.50 26.00 126.00 316.50 981.00 1278.50 8118.00
1921 1319.00 1169.50 919.00 437.50 234.50 40.50 0.00 19.00 69.00 463.50 1081.00 1382.50 7135.00
1922 1643.00 1406.00 1076.50 610.00 91.50 26.50 12.00 24.50 139.00 438.00 752.00 1435.50 7654.50
1923 1470.00 1541.00 1307.00 681.50 232.50 32.50 1.50 42.50 166.00 540.00 0.00 z 1060.00 7074.50
1924 1846.00 1312.00 1156.00 674.00 456.00 106.50 30.50 44.00 275.50 350.50 923.00 1664.50 8838.50
1925 1573.50 1234.50 0.00 z 424.50 403.50 66.00 27.00 15.00 154.50 780.50 958.00 1482.00 7119.00
1926 1468.00 1184.50 1288.00 675.00 193.50 97.24 a 12.00 6.00 237.00 552.83 a 1063.00 1490.50 8267.57
1927 1588.00 1124.67 a 880.00 587.00 365.00 108.00 7.50 51.67 a 198.00 430.38 a 933.50 1600.63 a 7874.35
1928 1451.50 1293.09 a 1070.00 759.50 164.50 99.11 b 10.00 25.50 255.00 454.50 842.00 1237.00 7661.70
1929 1893.00 1541.00 944.50 517.50 369.00 69.50 8.50 18.00 166.03 a 503.00 1045.50 1372.50 8448.04
1930 1679.50 1123.50 1050.50 503.50 253.00 26.50 15.50 12.00 132.00 544.00 799.00 1321.50 7460.50
1931 1239.00 969.00 1037.00 497.50 302.77 a 30.52 a 4.81 b 30.00 61.00 363.22 a 727.00 1081.68 c 6343.49
1932 1296.12 b 1318.90 e 1319.50 664.44 c 250.50 5.50 13.50 5.00 157.76 a 588.50 1048.50 1406.37 a 8074.59
1933 1246.50 1370.92 b 1117.07 b 674.50 249.50 20.00 c 3.10 a 8.00 84.50 598.62 b 1071.43 b 1474.05 a 7918.19
1934 1327.32 a 1422.30 a 1185.75 a 674.00 113.15 a 13.97 a 7.50 77.00 157.76 a 403.00 a 820.00 c 1490.14 b 7691.88
1935 1609.93 a 1205.62 b 1014.50 626.50 344.50 136.55 a 0.00 42.50 173.50 486.00 1017.41 a 1380.02 a 8037.03
1936 1714.62 b 1786.61 a 1065.22 b 764.00 111.60 a 60.50 0.00 6.00 95.00 580.00 1016.38 a 1262.22 a 8462.15
1937 1630.27 c 1377.00 1175.50 657.50 225.00 58.97 a 4.50 3.00 188.00 615.00 1013.79 a 1467.00 8415.53
1938 1526.23 a 1160.50 878.85 a 569.50 270.50 46.50 2.50 3.50 141.96 b 356.00 890.50 1375.76 b 7222.31
1939 1363.00 1441.48 a 1120.13 a 659.50 152.50 55.50 6.00 15.00 121.50 499.50 873.00 1103.60 a 7410.71
1940 1718.50 1233.02 a 1213.65 a 697.22 c 328.00 47.50 16.50 73.00 125.36 b 418.50 995.17 a 1306.00 8172.42
1941 1441.00 1348.50 1250.69 b 413.04 b 147.50 58.50 11.37 a 16.00 93.50 503.50 804.00 1107.22 a 7194.81
1942 1411.00 1318.50 950.15 a 386.50 268.50 53.28 a 10.33 a 16.00 245.50 505.50 930.00 1507.00 7602.26
1943 1627.00 1269.00 1251.00 662.50 285.00 50.50 3.50 12.50 258.00 461.50 1029.00 1289.50 8199.00
1944 1196.00 1235.50 1208.50 668.00 174.50 40.00 3.50 12.50 117.93 a 492.50 781.03 a 1498.85 a 7428.82
1945 1645.00 1315.48 a 758.50 582.86 b 378.50 157.50 24.50 14.50 198.00 529.00 980.17 a 0.00 z 6584.01
1946 1422.12 c 1347.77 b 753.00 516.96 b 311.50 109.00 4.50 34.00 174.50 389.00 891.00 1265.66 b 7219.01
1947 1335.14 b 1361.00 1097.50 710.50 427.00 120.00 16.50 1.50 186.50 231.50 1092.50 1401.00 7980.64
1948 1704.50 1455.50 1125.50 469.66 a 253.50 38.50 5.50 10.50 98.00 513.00 827.50 1373.50 7875.16
1949 1452.87 a 1310.50 1096.00 513.46 d 210.50 21.00 0.50 19.50 247.50 374.00 898.50 1319.00 7463.33
1950 1616.65 a 1338.00 1259.00 846.00 296.50 55.18 b 32.60 b 117.00 194.00 380.50 1084.50 1670.50 8890.43
1951 1667.80 a 1346.50 1258.60 a 692.50 219.00 117.50 25.00 81.00 306.00 574.00 1251.50 1510.50 9049.90
1952 1587.00 1315.00 1260.50 553.50 329.50 52.00 13.50 39.00 231.43 b 757.50 924.00 1308.50 8371.43
1953 1463.50 1387.50 1140.50 749.50 312.50 51.00 23.50 23.25 a 221.00 391.00 814.00 1304.00 7881.25
1954 1632.00 1049.50 1191.00 593.00 469.50 67.00 16.00 43.50 198.00 558.50 842.50 1318.50 7979.00
1955 1528.82 a 1352.50 1206.50 425.50 181.50 58.50 0.00 13.00 165.50 446.00 1100.00 1561.50 8039.32
1956 1502.00 1423.00 1254.50 725.17 a 323.50 53.00 24.00 34.50 248.00 317.50 944.00 1305.50 8154.67
1957 1723.00 1231.50 1058.50 571.00 324.47 a 47.00 0.50 33.50 222.50 569.00 960.50 1288.00 8029.47
1958 1371.50 1408.00 1041.50 595.50 261.50 128.28 a 11.50 33.00 147.50 426.00 885.50 1577.00 7886.78
1959 1745.50 1444.50 1171.50 633.62 a 190.00 42.00 30.50 5.50 176.00 627.50 1179.50 1122.00 8368.12
1960 1402.00 1260.00 1353.50 569.00 316.00 102.00 40.50 22.00 188.79 a 512.50 829.00 1399.00 7994.29
1961 1530.00 1099.00 983.00 715.00 359.00 76.50 12.00 14.50 200.00 424.50 930.00 1446.00 7789.50
1962 1680.00 1398.50 1147.50 649.50 203.50 76.50 32.50 33.00 266.00 438.00 867.00 1383.50 8175.50
1963 1860.00 1506.50 1042.00 521.50 342.00 62.50 11.50 59.00 186.00 206.50 746.00 1616.00 8159.50
1964 1330.00 1205.50 1126.50 554.50 166.00 91.00 9.00 87.50 233.00 547.50 797.00 1500.00 7647.50
1965 1585.00 1381.50 1294.50 735.00 202.50 71.50 29.00 65.50 267.50 497.50 896.50 1142.50 8168.50
1966 1788.00 1290.00 954.50 700.50 419.00 75.50 7.50 64.00 222.00 521.00 918.50 1380.00 8340.50
1967 1442.50 1467.00 1107.50 602.00 460.00 45.00 50.50 95.00 223.00 545.00 992.50 1313.00 8343.00
1968 1527.50 1418.50 818.50 551.50 360.50 93.00 32.00 60.50 160.50 464.50 898.50 1395.00 7780.50
1969 1642.00 1261.00 1240.00 540.00 277.00 218.00 18.50 7.50 220.00 577.00 964.00 1318.00 8283.00
1970 1761.50 1354.00 1190.50 584.00 278.00 67.00 18.50 23.50 191.00 433.00 944.00 1387.00 8232.00
1971 1776.00 1351.50 1223.50 626.00 360.50 48.50 37.00 63.00 162.50 317.00 885.00 1316.00 8166.50
1972 1731.00 1500.00 1266.00 755.50 204.00 99.50 41.00 51.50 203.50 623.50 945.50 1515.50 8936.50
1973 1423.50 1217.50 808.00 665.50 414.00 26.00 2.00 16.50 201.50 336.50 925.00 1403.50 7439.50
1974 1520.50 1341.00 1090.00 571.00 386.50 124.00 7.00 30.50 296.50 519.00 864.50 1234.50 7985.00
1975 1462.50 1313.00 1279.00 829.50 220.00 84.00 34.00 31.50 303.00 433.00 762.50 904.00 k 6752.00
1976 1674.50 1164.00 1037.50 528.50 320.00 27.50 7.50 55.00 260.50 654.50 1159.00 1681.00 8569.50
1977 1938.00 1254.00 884.53 a 442.00 100.00 98.00 6.50 74.00 151.00 531.00 934.50 1457.50 7871.03
1978 1713.50 1509.00 1198.50 690.50 345.17 e 12.00 t 25.50 28.50 145.50 537.50 1015.38 d 1484.90 a 8693.96
1979 1806.04 d 1533.00 1097.00 699.50 360.63 a 81.50 12.00 50.50 151.50 603.00 968.50 1211.00 8574.17
1980 1539.50 1426.00 1218.50 560.50 221.50 85.34 a 4.00 11.00 194.00 657.50 889.50 1396.00 8203.34
1981 1495.00 1187.50 947.00 526.03 a 298.50 50.50 20.50 22.50 237.50 615.50 809.48 a 1396.00 7606.02
1982 1832.50 1366.50 1140.00 719.00 139.50 161.00 4.50 67.50 251.00 523.50 985.00 1198.50 8388.50
1983 1370.50 1082.50 999.00 714.50 440.00 92.50 8.00 0.00 211.00 527.50 863.50 1733.00 8042.00
1984 1600.50 1056.00 1253.50 570.00 366.00 12.50 18.50 19.00 246.50 453.00 948.00 1367.00 7910.50
1985 1626.50 1357.50 936.50 489.00 163.50 143.00 6.50 48.50 236.50 543.50 1108.00 1737.50 8396.50
1986 1544.32 a 1364.00 989.00 473.50 209.50 57.50 14.00 82.50 202.50 522.50 1047.00 1296.00 7802.32
1987 1379.00 1059.50 908.00 470.50 221.50 39.00 13.00 44.00 159.50 701.00 825.50 1167.50 6988.00
1988 1638.35 a 1457.00 1034.50 560.00 157.00 54.00 7.00 32.00 157.50 681.00 878.50 1378.50 8035.35
1989 1301.50 1473.50 1203.50 665.50 304.50 103.00 7.00 20.50 208.50 479.00 1065.50 1678.50 8510.50
1990 1178.50 1188.00 967.00 565.50 385.00 72.00 16.00 28.00 146.50 580.50 790.00 1434.00 7351.00
1991 1640.00 1176.00 992.50 520.00 236.50 24.50 18.00 21.50 286.00 527.00 1101.00 1321.00 7864.00
1992 1349.50 1124.00 1059.00 716.50 259.00 120.00 59.00 85.00 250.50 554.50 993.00 1344.50 7914.50
1993 1504.00 1318.50 1083.50 722.50 284.50 117.00 8.50 27.00 351.00 611.00 1021.50 1299.00 8348.00
1994 1840.50 1443.00 1001.00 625.50 244.00 45.50 22.00 66.00 141.50 465.00 817.50 1182.50 7894.00
1995 1479.50 1320.00 1001.50 788.00 302.00 51.50 23.50 3.00 265.00 546.00 1211.00 1526.50 8517.50
1996 1658.50 1436.50 1316.50 761.50 420.50 73.50 29.50 22.00 221.00 553.50 1178.50 1443.50 9115.00
1997 1667.00 1234.50 1132.00 685.50 468.00 38.00 38.50 81.50 157.00 546.50 1028.50 1181.50 8258.50
1998 1391.00 958.50 1008.00 516.00 140.00 136.50 2.00 2.00 97.00 475.00 825.50 1212.50 6764.00
1999 1664.50 1084.50 1007.50 523.00 213.00 85.50 0.00 32.50 249.00 605.00 743.50 1320.50 7528.50
2000 1551.50 1166.50 825.00 651.50 255.00 101.00 27.00 17.50 234.50 439.00 969.50 1732.00 7970.00
2001 1398.50 1417.00 1155.00 537.00 243.00 108.50 25.00 15.50 252.50 586.50 645.00 1164.50 7548.00
2002 1281.00 1120.00 1250.00 685.00 445.50 72.50 7.00 22.00 131.50 697.00 993.00 1256.50 7961.00
2003 1592.00 1446.00 1090.50 667.50 299.50 93.50 10.00 9.00 214.50 565.50 967.00 1228.50 8183.50
2004 1706.50 1296.00 987.50 606.50 377.00 129.00 32.50 116.50 100.50 520.00 828.50 1372.00 8072.50
2005 1563.50 1129.50 1158.50 499.50 424.00 10.00 11.50 17.50 124.00 487.50 914.50 1466.00 7806.00
2006 1159.50 1324.50 1023.00 464.00 296.00 45.50 3.00 27.00 247.00 692.00 839.50 1179.00 7300.00
2007 1343.50 1490.50 944.50 644.50 204.00 40.50 12.00 29.50 183.50 404.00 974.00 1494.00 7764.50
2008 1569.00 1556.50 1288.50 720.50 443.50 60.50 5.00 22.50 162.00 568.00 952.00 1638.50 8986.50
2009 1842.50 1253.50 1128.50 659.50 294.50 119.50 63.00 66.00 110.50 712.50 739.00 1407.50 8396.50
2010 1500.50 1204.00 834.00 438.50 261.00 55.00 3.00 15.00 255.50 482.00 902.00 1464.50 7415.00
2011 1643.50 1318.50 1161.47 a 726.00 346.50 85.50 2.00 6.00 282.00 488.00 868.45 a 1224.00 8151.92
2012 1381.50 1141.50 602.00 601.50 199.50 60.50 3.50 39.00 243.50 424.50 h 0.00 z 0.00 z 4272.50
Period of Record Statistics
MEAN 1553.39 1332.21 1091.58 611.99 284.57 71.66 16.22 36.17 193.08 511.33 939.14 1390.65 7991.18
S.D. 172.70 154.39 151.43 105.33 93.05 38.59 13.36 27.38 60.50 109.20 116.52 159.00 483.76
SKEW -0.05 0.12 -0.39 -0.07 0.17 0.79 0.99 0.98 0.15 0.00 0.20 0.16 -0.35
MAX 1938.00 1786.61 1464.20 867.00 519.50 218.00 63.00 117.00 351.00 827.00 1251.50 1737.50 9115.00
MIN 1159.50 958.50 602.00 318.00 91.50 5.50 0.00 0.00 61.00 206.50 645.00 1060.00 6343.49
NO YRS 115 118 113 118 117 113 116 117 117 113 113 114 97