date! ,

Monthly Total Heating Degree Days

(a vali)

Base Temperature = 65 F

File last updated on Apr 6, 2013
*** Note *** Provisional Data *** After Year/Month 201304
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 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 w 0.00 50.00 186.43 b 481.05 c 1053.33 c 1612.00 3382.82
1894 1679.74 d 1460.15 a 963.58 a 532.00 313.00 48.62 a 0.00 14.50 177.00 556.00 1158.10 a 1259.63 a 8162.33
1895 1906.50 1601.19 a 0.00 z 462.41 a 293.50 43.00 28.50 23.50 157.00 759.00 1087.50 1419.59 b 7781.68
1896 1535.00 1310.50 1256.50 526.00 160.00 50.89 b 22.22 a 31.00 307.76 a 641.50 1297.00 1241.60 b 8379.97
1897 1688.00 1003.50 g 0.00 z 616.50 341.00 137.50 6.50 68.50 92.00 447.00 1139.00 1721.50 6257.50
1898 1450.00 1356.00 1015.00 0.00 z 248.00 32.00 19.50 10.50 145.50 653.50 1156.50 1708.50 7795.00
1899 1714.00 1704.50 1545.50 603.50 267.00 31.50 15.00 1.50 258.00 445.50 759.00 1521.50 8866.50
1900 1415.00 1568.00 1298.00 432.00 172.00 18.50 5.00 0.00 195.50 293.50 1155.50 1416.50 7969.50
1901 1580.50 1567.00 1158.00 534.00 203.57 a 68.50 2.50 4.00 229.00 498.50 1054.00 1625.50 8525.07
1902 1558.00 1416.00 922.00 603.00 203.50 111.50 5.50 43.50 266.50 502.50 879.00 1598.50 8109.50
1903 1562.50 1418.00 941.00 586.00 194.50 94.50 12.50 72.00 261.43 b 505.82 a 1069.66 a 1665.22 a 8383.12
1904 1822.80 a 1727.50 1096.50 711.00 271.00 34.50 16.00 53.00 171.00 483.50 785.50 1461.50 8633.80
1905 1898.00 1559.00 919.00 629.50 308.00 61.00 f 33.00 5.00 108.50 612.50 915.50 1293.73 a 8281.73
1906 1424.50 1373.50 1294.00 522.00 307.00 88.50 22.50 14.50 77.00 513.00 975.52 a 1348.00 7960.02
1907 1686.00 1298.50 971.00 847.50 538.00 123.00 5.00 47.00 243.50 568.50 927.50 1255.00 8510.50
1908 1411.00 1285.00 1040.00 609.00 296.50 108.50 15.00 30.00 120.50 485.00 872.00 1364.50 7637.00
1909 1527.00 1252.00 1181.00 812.50 306.50 55.00 24.50 10.50 183.50 561.00 834.50 1640.00 8388.00
1910 1600.00 1485.50 635.00 447.50 395.00 106.50 0.00 20.00 155.00 406.50 1100.00 1437.50 7788.50
1911 1648.50 1178.50 922.00 673.00 199.00 18.00 22.00 59.50 176.50 612.00 1208.50 1271.50 7989.00
1912 2134.00 1533.50 1399.50 564.50 253.50 134.00 24.50 50.50 237.50 498.00 856.00 1272.50 8958.00
1913 1539.50 1407.50 1179.50 532.00 353.00 62.50 6.50 1.50 208.00 579.00 728.50 1084.50 7682.00
1914 1295.00 1532.00 1054.00 630.50 265.50 57.50 4.00 37.50 151.00 327.50 878.00 1679.00 7911.50
1915 1640.50 1141.00 1186.50 340.50 385.50 118.45 a 47.00 105.00 152.00 427.50 904.50 1379.50 7827.95
1916 1619.50 1508.00 1119.00 634.50 288.50 134.00 0.00 28.50 219.00 557.50 990.00 1626.00 8724.50
1917 1751.00 1621.00 1136.50 674.00 388.50 123.50 27.00 46.00 188.50 826.00 808.00 1704.00 9294.00
1918 1899.00 1299.00 848.50 684.00 173.00 54.00 28.00 14.50 316.00 458.50 830.50 1134.50 7739.50
1919 1334.50 1268.50 1019.00 623.50 326.50 47.50 0.00 27.00 118.50 580.50 1103.50 1713.00 8162.00
1920 1796.00 1404.00 1027.50 793.50 283.00 83.00 22.00 51.00 116.50 311.00 1010.50 1332.50 8230.50
1921 1329.50 1142.00 904.00 452.00 245.00 36.50 2.50 27.50 109.00 472.75 a 1122.50 1318.00 7161.25
1922 1620.50 1385.00 1001.50 614.50 150.00 28.00 30.50 23.00 157.00 422.50 802.50 1480.00 7715.00
1923 1452.00 1501.11 a 1358.00 658.00 275.50 57.50 3.00 43.00 167.00 593.00 842.00 1085.00 8035.11
1924 1807.50 1270.50 1131.50 595.00 504.50 119.50 48.00 60.50 292.00 333.50 958.00 1721.50 8842.00
1925 1610.00 1223.00 945.00 424.50 397.50 73.50 38.50 11.00 118.50 898.50 1002.00 1557.00 8299.00
1926 1539.00 1158.00 1213.00 709.00 183.00 141.00 15.00 8.50 237.50 593.50 1140.00 1569.50 8507.00
1927 1614.50 1133.00 914.00 592.00 359.50 149.00 36.00 74.00 232.00 440.00 1008.50 1694.50 8247.00
1928 1462.00 1241.00 1011.00 794.00 218.00 144.00 9.50 46.00 276.50 495.00 944.50 1279.27 a 7920.77
1929 1991.50 1616.00 1030.50 570.50 406.00 109.50 17.50 33.00 235.50 563.50 1147.50 1444.50 9165.50
1930 1855.00 1059.00 1005.50 548.50 283.50 50.50 23.00 18.50 188.50 608.00 875.00 1375.50 7890.50
1931 1309.50 970.50 1071.00 516.50 370.00 35.50 11.00 39.00 103.50 416.50 787.50 1109.50 6740.00
1932 1503.00 1339.00 1364.00 605.17 a 234.00 11.00 21.00 16.00 247.00 626.50 1083.50 1495.50 8545.67
1933 1236.00 1433.50 1097.00 658.50 282.00 28.00 1.50 42.00 97.00 610.00 1009.00 1437.50 7932.00
1934 1376.50 1307.50 1155.00 643.00 108.00 16.00 8.78 a 84.50 261.50 420.00 849.50 1619.00 7849.28
1935 1687.00 1203.50 1004.50 687.50 406.50 139.50 0.00 65.50 180.50 587.00 1082.00 1519.50 8563.00
1936 1901.00 1916.00 1073.50 787.00 132.50 101.00 0.00 6.50 129.00 612.50 1041.00 1323.50 9023.50
1937 1873.50 1498.00 1208.50 668.00 283.00 110.00 11.50 0.00 237.41 a 670.63 a 1066.00 1499.00 9125.55
1938 1562.00 1225.00 907.50 613.50 305.00 70.50 0.00 6.00 148.00 354.00 1013.50 1397.50 7602.50
1939 1395.50 1456.00 1127.50 704.00 143.50 47.00 5.50 29.00 135.50 558.50 871.50 1142.50 7616.00
1940 1851.50 1341.00 1267.00 698.50 338.50 45.50 14.50 51.15 a 159.00 398.50 1078.50 1391.50 8635.15
1941 1473.50 1427.00 1224.50 444.00 143.50 82.00 16.00 15.50 146.50 498.50 912.00 1191.00 7574.00
1942 1501.50 1312.00 969.00 498.62 a 363.50 91.00 15.50 38.50 281.50 514.00 987.00 1574.00 8146.12
1943 1800.50 1389.00 1373.00 667.00 395.77 a 73.50 8.27 a 35.81 b 299.00 533.50 1104.50 1340.50 9020.34
1944 1228.00 1322.50 1259.12 a 743.00 225.50 65.00 8.50 36.00 168.50 487.00 819.50 1555.50 7918.12
1945 1648.00 1368.00 876.50 660.00 450.00 189.00 34.00 29.50 228.50 555.50 1018.97 a 1586.17 a 8644.13
1946 1518.50 1317.00 767.25 a 466.50 345.50 97.76 a 3.00 60.00 203.50 432.00 959.50 1295.50 7466.01
1947 1414.50 1454.96 a 1179.50 748.00 420.50 124.50 27.38 a 6.00 197.50 260.00 1116.00 1448.00 8396.85
1948 1737.00 1449.00 1179.50 496.50 305.50 47.59 a 14.00 9.50 109.00 513.05 a 856.00 1402.50 8119.14
1949 1610.50 1436.50 1144.50 594.83 a 174.00 20.50 0.50 13.00 246.50 383.50 872.00 1376.00 7872.33
1950 1670.50 1406.50 1455.00 806.50 289.33 a 84.00 22.00 76.00 167.50 375.50 1146.00 1720.50 9219.33
1951 1745.00 1404.15 a 1395.00 a 790.00 158.00 111.00 24.50 55.00 299.48 a 542.50 1231.00 1494.00 9249.63
1952 1621.50 1200.39 a 1236.00 572.00 311.50 37.50 b 20.50 41.50 187.50 678.00 905.00 1345.50 8156.89
1953 1501.95 a 1291.50 1071.05 a 751.00 309.48 a 44.00 17.50 10.50 192.00 320.00 822.50 1343.50 7674.98
1954 1670.50 965.50 1173.00 582.00 422.00 61.50 1.50 22.00 170.00 566.50 853.00 1349.50 7837.00
1955 1602.50 1440.50 1250.00 417.00 172.64 b 81.50 0.00 8.00 168.50 518.73 a 1198.50 1657.00 8514.87
1956 1659.00 1527.00 1283.50 717.00 297.00 36.00 28.50 32.03 a 256.00 343.00 995.00 1317.50 8491.53
1957 1746.00 1224.22 a 1125.00 622.50 335.50 66.50 0.00 45.47 a 301.50 651.00 1082.50 1340.50 8540.69
1958 1463.50 1510.44 a 1078.00 581.50 232.00 149.48 a 37.50 46.50 179.00 462.50 921.00 1602.00 8263.43
1959 1740.50 1494.23 b 1184.00 584.50 187.50 35.00 21.50 9.50 208.50 665.50 1231.50 1110.00 8472.23
1960 1456.50 1327.79 a 1458.07 b 596.00 278.00 107.50 29.50 18.50 201.50 508.00 865.50 1461.00 8307.85
1961 1579.50 1141.00 1055.00 795.50 353.00 58.50 18.17 b 11.00 244.50 473.00 967.50 1515.00 8211.67
1962 1783.53 a 1396.50 1275.50 729.50 198.00 89.48 a 41.00 35.50 283.00 450.50 878.50 1411.50 8572.52
1963 1887.50 1460.00 1015.00 545.50 327.00 44.00 4.00 57.50 158.50 210.00 783.50 1693.50 8186.00
1964 1376.50 1207.00 1223.50 599.50 158.50 65.50 5.50 105.50 233.00 566.00 889.00 1536.00 7965.50
1965 1695.50 1514.50 1445.00 731.50 207.50 45.00 14.00 65.50 291.00 494.00 922.00 1134.00 8559.50
1966 1868.50 1417.00 995.00 706.50 417.00 57.00 3.00 64.50 207.50 564.50 1006.50 1438.50 8745.50
1967 1514.00 1523.50 1103.50 631.00 468.00 35.00 48.50 77.50 213.50 578.00 1059.50 1344.00 8596.00
1968 1585.00 1444.00 898.00 558.50 392.00 84.00 17.00 50.50 198.50 481.50 942.00 1457.00 8108.00
1969 1762.00 1330.00 1335.50 591.00 282.50 187.50 13.00 3.50 183.50 650.00 980.00 1456.00 8774.50
1970 1907.50 1432.00 1249.00 632.50 282.00 66.50 22.50 11.00 231.50 524.50 1020.50 1512.80 a 8892.30
1971 1835.50 1426.50 1263.00 608.00 376.50 31.50 40.00 44.00 191.00 350.50 931.50 1401.00 8499.00
1972 1806.50 1554.00 1176.50 739.00 240.00 95.00 38.00 63.50 208.00 659.00 1009.50 1638.00 9227.00
1973 1547.00 1272.50 824.00 687.00 387.00 25.50 3.10 a 19.50 204.50 356.00 916.50 1527.50 7770.10
1974 1635.00 1395.00 1141.50 596.50 380.00 102.50 3.50 51.00 313.50 514.50 926.90 a 1314.00 8373.90
1975 1557.00 1381.50 1378.50 834.00 232.50 89.50 26.00 17.50 307.50 454.00 821.50 1373.00 8472.50
1976 1632.50 1141.50 1097.00 511.00 319.00 37.00 5.00 36.00 224.00 695.50 1139.50 1677.10 a 8515.10
1977 2046.50 1251.00 870.00 424.00 100.50 45.50 3.00 62.50 142.00 570.00 1007.00 1558.50 8080.50
1978 1879.50 1599.50 1205.50 609.00 262.00 54.00 15.50 15.00 113.50 549.50 1009.00 1585.50 8897.50
1979 2001.50 1626.50 1204.00 744.00 338.42 a 68.00 8.50 59.00 151.00 562.50 991.50 1268.50 9023.42
1980 1571.00 1477.00 1247.00 603.50 219.00 45.50 2.00 15.50 175.50 640.00 889.00 1424.50 8309.50
1981 1451.00 1179.50 918.00 513.50 308.00 42.00 18.50 18.50 220.00 609.00 839.50 1473.02 a 7590.52
1982 1953.00 1421.00 1187.00 759.00 184.50 106.50 0.00 71.00 201.00 493.00 1020.00 1234.00 8630.00
1983 1467.00 1163.00 1024.50 762.00 378.00 77.00 6.00 1.00 206.50 500.00 852.00 1888.79 c 8325.79
1984 1631.00 1145.50 1297.50 597.00 342.00 9.00 16.00 15.00 240.00 450.50 965.50 1405.50 8114.50
1985 1737.50 1448.50 892.00 480.50 131.00 113.50 9.00 67.00 249.31 a 564.50 1211.50 1837.50 8741.81
1986 1542.00 530.00 q 807.50 j 119.00 t 227.00 42.50 18.00 68.00 177.50 508.50 1175.00 1353.50 5112.00
1987 1447.50 996.00 889.00 437.00 144.00 20.50 12.00 48.50 139.50 666.00 828.00 1290.00 6918.00
1988 1776.50 1573.52 b 1039.53 a 607.50 126.50 20.00 3.50 25.50 137.50 682.00 959.48 a 1458.00 8409.54
1989 1349.02 a 1522.50 1217.50 644.50 286.00 88.00 0.00 21.00 194.00 456.50 1098.50 1688.00 8565.52
1990 1246.50 1239.00 916.00 603.50 346.50 49.50 9.50 14.50 150.50 525.50 821.00 1544.00 7466.00
1991 1769.00 1194.00 1026.00 521.50 245.50 12.50 23.50 22.00 273.00 608.50 1202.50 1396.00 8294.00
1992 1414.00 1140.32 a 1069.50 745.00 251.00 82.00 97.50 110.50 248.50 568.50 1042.50 1430.13 a 8199.46
1993 1696.00 1431.50 1259.00 749.00 333.50 99.00 17.50 30.50 347.00 608.50 1064.50 1390.50 9026.50
1994 1912.50 1536.00 990.00 614.00 269.50 44.50 27.50 60.00 133.50 443.50 855.50 1297.50 8184.00
1995 1538.50 1311.00 1009.00 764.00 317.23 a 50.00 20.00 2.00 255.00 555.50 1193.00 1450.00 8465.23
1996 1758.50 1426.00 1256.50 752.00 414.00 80.50 23.50 0.00 z 0.00 z 243.00 u 1264.00 1606.00 8581.00
1997 1742.00 1342.50 1171.00 749.00 494.00 35.00 53.00 71.50 180.00 559.00 1131.00 1278.00 8806.00
1998 1456.00 1020.50 1156.50 541.50 145.18 a 135.50 8.78 a 4.00 102.00 503.00 887.00 1252.50 7212.47
1999 1702.50 1104.50 1048.00 577.50 245.50 95.50 0.00 36.50 257.50 588.50 761.50 1330.00 7747.50
2000 1602.00 1172.00 863.35 a 630.00 244.00 48.50 f 28.50 25.50 220.50 454.00 1058.28 a 1858.00 8156.13
2001 1529.00 1546.50 1327.00 588.00 276.50 116.50 14.00 33.50 266.50 608.00 628.50 1201.00 8135.00
2002 1304.00 1130.50 1312.50 668.00 405.00 54.50 8.00 29.00 162.00 710.00 1052.50 1313.00 8149.00
2003 1638.50 1437.00 1130.50 642.50 333.50 87.00 12.50 9.50 238.00 555.50 1043.50 1301.50 8429.50
2004 1667.50 1400.50 967.00 600.00 331.50 119.50 38.50 131.50 117.00 537.00 883.00 1401.00 8194.00
2005 1616.00 1133.00 1178.00 496.00 382.50 13.00 18.00 42.00 131.50 516.00 929.50 1572.50 8028.00
2006 1226.50 1335.00 1102.50 488.00 314.50 52.50 2.00 9.00 274.00 683.00 909.50 1199.50 7596.00
2007 1504.50 1582.50 998.50 692.50 198.50 42.00 18.00 19.00 176.50 420.50 982.50 1566.00 8201.00
2008 1676.50 1577.50 1231.00 714.00 367.50 34.00 2.50 32.00 153.50 559.00 971.00 1672.00 8990.50
2009 1850.50 1294.50 1065.37 a 652.00 318.50 119.50 69.50 80.00 151.50 758.50 776.50 1542.00 8678.37
2010 1761.50 1505.00 963.50 461.50 318.00 54.00 4.00 19.50 238.20 e 459.04 e 976.50 1634.50 8395.24
2011 1765.50 1357.00 1212.00 703.00 349.50 62.40 e 4.50 13.50 268.00 474.00 886.00 1289.00 8384.40
2012 1414.00 1156.50 603.00 625.20 e 186.00 45.00 0.50 74.50 240.00 652.50 916.50 1346.00 7259.70
2013 1577.00 1378.00 1387.50 38.50 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4342.50
Period of Record Statistics
MEAN 1625.81 1365.70 1113.75 621.87 288.50 72.07 16.31 36.00 199.72 526.85 978.63 1446.02 8268.32
S.D. 189.29 169.21 171.92 105.27 91.51 39.50 15.54 26.54 58.90 112.92 131.52 173.51 510.10
SKEW 0.08 -0.01 -0.14 -0.11 0.10 0.63 1.83 0.91 0.16 0.07 0.15 0.15 -0.31
MAX 2134.00 1916.00 1545.50 847.50 538.00 189.00 97.50 131.50 347.00 898.50 1297.00 1888.79 9294.00
MIN 1226.50 965.50 603.00 340.50 100.50 9.00 0.00 0.00 77.00 210.00 628.50 1084.50 6740.00
NO YRS 120 118 117 117 119 117 120 119 119 119 120 120 112