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 1044.00 m 1636.00 1377.00 819.00 310.00 23.50 3.00 52.00 209.44 c 552.50 1047.50 1659.03 b 7688.98
1894 1875.00 1405.70 a 961.50 538.97 a 251.50 26.00 3.00 25.00 120.54 b 501.17 a 1082.78 c 1216.50 8007.65
1895 1948.00 1579.00 1138.00 356.50 251.10 a 45.00 d 22.00 18.00 160.56 c 593.50 1098.50 1454.50 8664.66
1896 1659.00 1305.00 1369.50 553.97 a 168.00 72.00 23.00 35.50 237.00 700.00 1440.00 1342.00 8904.96
1897 1847.00 1433.00 1463.00 619.50 274.00 154.00 3.50 51.50 78.50 436.50 1112.50 1546.00 9019.00
1898 1349.00 1310.00 1063.50 546.50 268.50 0.00 z 11.50 24.00 145.00 663.00 1147.00 1574.50 8102.50
1899 1609.00 1636.50 1541.50 562.00 276.00 23.00 7.00 22.50 306.50 499.00 767.50 1488.00 8738.50
1900 1438.40 a 1669.00 1234.00 445.50 214.00 56.00 15.00 i 0.00 z 61.00 q 0.00 z 0.00 z 1382.00 6438.90
1901 637.50 r 1467.50 1105.50 488.50 219.00 64.50 0.00 6.50 238.50 472.00 1103.50 1562.00 6727.50
1902 1491.00 1362.50 982.18 a 664.50 258.33 a 122.50 15.00 39.55 b 265.00 541.50 973.33 c 1691.10 b 8406.51
1903 1674.50 1172.00 g 1144.00 647.00 241.80 a 108.50 23.52 b 85.25 a 253.50 483.50 1042.20 e 1615.88 c 7319.64
1904 911.50 m 465.00 t 1113.02 e 738.62 a 223.09 c 89.48 a 17.50 44.36 b 186.50 494.93 b 796.50 1014.50 h 3704.00
1905 1405.00 g 157.50 v 914.50 630.00 360.50 87.50 13.90 b 13.00 75.50 615.00 882.50 1333.00 4925.40
1906 1426.50 1314.00 1345.50 442.24 a 284.00 62.50 18.50 26.50 98.50 547.00 997.00 1070.50 h 6562.24
1907 1809.33 e 1311.50 1040.05 a 874.00 549.50 78.50 2.00 24.50 202.50 538.50 904.50 1302.00 8636.88
1908 1380.50 1312.50 1112.50 534.00 300.00 95.00 19.93 c 21.50 132.41 a 521.50 856.00 1394.00 7679.84
1909 1618.00 1350.00 1124.50 779.00 303.50 53.50 13.00 8.50 156.50 533.41 b 919.00 1680.50 8539.41
1910 1600.12 a 1574.50 633.50 431.50 314.00 110.00 4.00 38.00 165.00 b 337.50 1101.00 1456.00 7765.12
1911 1732.26 b 1308.00 836.50 633.10 a 181.00 16.00 20.00 61.43 d 184.00 594.00 1319.50 1383.50 8269.29
1912 2067.50 1408.57 a 1317.50 521.00 221.50 109.00 23.50 37.72 a 282.00 452.71 b 807.00 1283.50 8531.50
1913 1505.10 b 1486.00 1283.50 524.00 362.50 61.00 11.00 3.62 a 206.00 650.48 a 725.00 1141.83 a 7960.04
1914 1319.50 1566.00 1088.00 592.50 213.00 16.00 3.00 57.00 136.00 319.82 a 839.50 1692.08 a 7842.40
1915 1619.00 1148.00 1191.00 315.50 363.50 111.00 32.50 71.00 174.50 395.50 871.50 1390.50 7683.50
1916 1803.17 a 1563.50 1176.50 662.50 294.00 94.50 0.00 43.50 231.50 569.50 940.50 1676.07 a 9055.23
1917 1798.00 1659.00 1177.00 711.50 342.00 104.00 12.50 45.00 187.50 792.00 794.00 1766.50 9389.00
1918 1923.00 1349.00 850.50 651.00 208.00 47.00 16.00 14.50 303.50 426.50 844.50 1212.00 7845.50
1919 1286.00 1364.00 1071.50 575.50 262.50 70.00 0.00 15.50 117.50 704.00 1175.50 1625.95 a 8267.95
1920 1722.00 1374.00 813.23 a 802.00 214.00 63.50 9.50 22.00 118.00 323.50 1011.50 1395.50 7868.73
1921 1402.50 1182.50 963.00 459.50 243.00 23.50 0.00 18.00 128.50 433.00 1247.00 1341.50 7442.00
1922 1546.00 1534.00 1050.50 576.11 c 145.00 11.00 10.50 12.50 150.00 466.00 817.00 1419.69 d 7738.30
1923 1563.00 1517.50 1331.50 679.00 223.20 a 36.50 0.00 33.00 113.00 547.50 789.50 1039.03 b 7872.73
1924 1770.00 1213.00 1061.50 597.00 456.50 93.50 15.00 33.50 185.00 262.50 899.00 1776.50 8363.00
1925 1665.00 1239.50 933.50 412.00 363.50 52.50 14.00 12.00 103.50 810.00 973.00 1474.50 8053.00
1926 1526.50 1158.50 1217.00 626.50 130.50 93.50 10.00 11.00 242.00 496.00 1133.50 1599.00 8244.00
1927 1588.50 1180.00 938.00 570.00 352.50 110.50 15.50 39.00 212.00 354.00 1105.00 1856.50 8321.50
1928 1484.38 a 1192.62 a 0.00 z 691.00 159.65 a 93.50 1.00 0.00 z 0.00 z 494.50 861.00 1209.50 6187.16
1929 1966.00 1627.00 935.00 566.00 379.00 47.50 3.00 4.28 b 318.50 520.00 1085.00 1496.50 8947.78
1930 1862.50 1022.50 1037.00 513.00 275.00 57.00 16.50 11.00 226.00 588.00 913.00 1279.50 7801.00
1931 1203.50 949.50 1056.50 512.07 a 335.83 a 27.00 6.72 a 33.00 94.50 395.00 820.00 1214.17 a 6647.79
1932 1529.00 1314.00 1314.00 611.50 228.00 3.00 18.50 10.85 a 176.00 600.00 1090.50 1516.00 8411.35
1933 1365.00 1455.00 1045.50 615.50 264.50 16.50 3.00 19.50 69.00 560.50 1015.50 1534.50 7964.00
1934 1387.00 1250.50 1086.50 571.00 92.00 16.00 3.50 52.50 267.50 368.50 814.00 1545.00 7454.00
1935 1732.50 1020.50 958.50 673.00 360.00 103.50 0.00 55.50 145.86 a 584.00 1227.00 1535.00 8395.36
1936 2066.50 2027.50 1124.50 788.00 131.00 77.50 2.07 a 12.50 121.50 593.00 1094.00 1371.00 9409.07
1937 1978.00 1478.50 1179.50 663.00 189.50 85.00 0.00 1.50 182.50 591.50 1030.00 1528.00 8907.00
1938 1672.00 1338.50 900.00 565.50 344.00 42.00 0.50 4.00 115.00 295.00 1075.00 1345.50 7697.00
1939 1450.50 1583.00 1050.00 625.50 106.95 a 29.50 0.50 14.50 150.50 533.50 792.00 1088.50 7424.95
1940 1807.50 1322.00 1257.00 699.50 276.42 a 50.50 10.50 77.00 132.00 348.00 1159.00 1381.00 8520.42
1941 1542.50 1412.00 1159.50 469.50 154.00 96.50 26.50 32.50 186.50 483.00 914.00 1227.50 7704.00
1942 1417.50 1303.00 941.50 469.50 338.50 86.00 15.00 27.50 302.00 497.00 962.50 1584.50 7944.50
1943 1899.50 1414.00 1311.00 564.50 357.00 72.00 4.00 8.50 225.50 424.00 0.00 z 1281.00 7561.00
1944 1193.00 1350.00 1284.00 710.50 225.00 54.00 7.00 37.00 155.50 436.00 847.50 1419.50 7719.00
1945 1559.82 a 1357.00 862.50 660.00 412.50 150.00 31.00 20.00 248.00 498.00 1047.00 1670.00 8515.82
1946 1582.50 1448.00 797.00 424.00 326.00 97.50 5.00 47.00 216.50 515.00 1034.00 1400.00 7892.50
1947 1366.00 1499.50 1161.50 715.00 369.00 103.50 21.50 8.50 213.00 307.00 1153.50 1520.60 b 8438.60
1948 1795.00 1543.00 1266.00 511.50 251.00 57.50 4.00 15.50 a 102.93 a 481.50 954.50 1501.50 8483.93
1949 1754.50 1561.50 1155.00 565.50 178.00 29.00 13.00 9.50 246.00 473.50 838.00 1484.00 8307.50
1950 1947.00 1417.50 1277.00 885.00 a 362.50 66.50 15.00 62.00 129.50 433.00 1157.50 1674.00 9426.50
1951 1782.00 1373.00 1511.00 738.00 153.45 a 124.50 21.00 34.50 295.00 568.50 1209.31 a 1615.50 9425.76
1952 1751.50 1291.04 b 1377.00 531.50 249.00 33.00 12.00 18.50 171.50 629.00 916.00 1353.50 8333.54
1953 1574.00 1330.00 1086.50 731.50 297.00 66.00 11.00 5.00 177.50 317.50 834.50 1479.50 7910.00
1954 1885.00 989.50 1202.50 624.50 393.18 a 63.00 9.00 11.50 185.50 578.00 834.50 1337.00 8113.18
1955 1606.00 1525.00 1262.00 362.00 129.00 61.00 0.00 5.50 192.50 471.00 1277.00 1760.50 8651.50
1956 1773.00 1576.00 1286.00 771.50 266.50 27.00 19.00 31.00 257.00 324.50 998.00 1302.00 8631.50
1957 1794.00 1304.00 1125.00 620.50 332.50 58.00 0.00 35.50 245.00 526.00 974.00 1250.00 8264.50
1958 1395.50 1480.00 1093.00 564.50 211.50 165.00 33.00 36.50 151.00 428.00 918.50 1576.50 8053.00
1959 1766.50 1482.00 974.00 621.50 256.00 42.00 16.00 5.00 193.50 721.00 1273.00 1133.50 8484.00
1960 1668.00 1462.50 1467.00 601.00 245.50 63.00 13.50 10.50 f 201.50 471.00 909.00 1445.50 8547.50
1961 1539.15 a 1147.50 926.50 772.00 357.50 36.00 5.50 4.50 236.38 a 456.00 981.00 1587.72 a 8049.75
1962 1721.53 a 1446.50 1267.50 676.00 179.50 60.50 26.50 4.50 245.00 203.50 k 834.00 1394.50 7856.03
1963 1862.00 1387.00 936.00 493.50 276.00 33.10 a 3.50 14.00 107.00 230.00 877.00 1720.50 7939.60
1964 1417.00 1247.00 1328.00 580.50 197.50 59.50 5.50 87.00 256.50 522.50 941.00 1679.50 8321.50
1965 1811.00 1494.50 1493.50 641.50 172.50 13.50 5.00 0.00 z 415.00 410.23 a 1014.00 1200.00 8670.73
1966 1959.00 1466.00 911.92 a 744.00 348.00 64.00 0.00 58.50 201.00 517.00 1108.50 1477.50 8855.42
1967 1548.50 1551.50 1010.50 568.50 382.50 41.50 34.10 a 54.00 164.50 539.00 963.00 1356.00 8213.60
1968 1564.00 1491.50 778.00 496.00 352.50 55.50 0.00 z 39.00 150.50 504.50 935.50 1568.00 7935.00
1969 1895.50 1370.96 a 1433.50 542.00 222.50 176.50 8.00 3.00 162.00 613.50 952.50 1434.50 8814.46
1970 1885.00 1390.50 1238.00 640.50 207.00 25.50 11.50 20.50 199.00 536.50 1034.00 1521.50 8709.50
1971 1816.50 1340.00 1081.50 533.50 286.00 22.00 56.00 58.50 206.50 428.50 1005.00 1533.50 8367.50
1972 1780.50 1629.50 1130.50 667.24 a 217.00 54.00 26.50 51.50 230.50 672.00 1067.00 0.00 z 7526.24
1973 1495.50 1223.50 807.50 619.50 256.00 29.00 10.00 6.00 196.00 319.00 917.00 1501.00 7380.00
1974 1708.00 1310.50 1079.50 541.00 320.50 53.00 1.00 61.50 234.50 392.50 927.50 1270.00 7899.50
1975 1560.50 1434.50 1287.00 793.00 161.00 51.00 15.00 9.00 228.50 396.50 953.00 1449.50 8338.50
1976 1667.50 1098.50 998.50 397.00 227.00 18.50 1.00 6.00 177.50 659.00 1155.00 1609.00 8014.50
1977 1997.00 1173.50 879.76 b 363.50 63.00 14.50 6.00 43.50 123.50 502.50 965.56 c 1597.05 c 7729.37
1978 1938.50 1508.08 c 1109.00 617.50 154.50 48.50 11.50 8.00 118.00 412.50 1018.50 1536.00 8480.58
1979 2034.00 1653.00 843.50 i 723.00 258.50 f 32.00 0.00 32.15 d 74.00 g 553.98 d 993.50 1144.33 b 7165.96
1980 1569.00 1421.00 1197.52 d 427.00 161.50 8.00 0.00 7.50 137.00 568.50 861.00 1417.50 7775.52
1981 1456.00 1164.00 791.50 393.00 228.50 13.50 9.50 9.00 134.00 528.50 831.50 1596.00 7155.00
1982 2158.00 1424.50 1120.50 635.50 132.00 78.00 0.00 29.00 176.00 490.50 1116.50 1266.35 a 8626.85
1983 1495.00 1141.50 1034.00 720.00 356.50 81.00 2.00 0.00 211.50 570.50 945.52 a 2004.50 8562.02
1984 1609.50 1157.00 1346.00 583.00 333.50 22.50 9.50 19.50 317.50 484.00 959.50 1503.50 8345.00
1985 1737.50 1460.85 b 878.00 375.00 90.00 78.00 0.00 33.00 242.07 a 534.50 1265.50 1747.50 8441.92
1986 1439.50 1408.50 920.50 489.00 178.00 8.50 0.00 35.00 148.00 464.00 1087.50 1193.00 7371.50
1987 1295.50 878.50 857.50 326.50 106.50 9.00 3.00 28.50 106.00 616.50 836.50 1305.00 6369.00
1988 1725.00 1495.00 972.00 535.00 73.00 11.00 0.00 17.57 a 102.50 604.00 1000.86 a 1367.50 7903.43
1989 1327.00 1573.50 1197.00 571.00 201.00 65.00 0.00 5.50 176.00 481.00 1099.50 1691.00 8387.50
1990 1182.00 1166.00 931.00 563.00 265.00 37.50 13.50 20.00 0.00 z 526.50 875.00 1544.00 7123.50
1991 1597.00 1060.00 990.50 476.50 216.50 10.50 6.00 6.00 189.50 540.00 1212.00 1338.50 7643.00
1992 1288.00 1079.00 891.50 667.50 183.00 77.50 53.00 85.50 174.00 534.00 1076.50 1535.50 7645.00
1993 1690.50 1475.50 1169.50 648.50 241.00 84.50 5.00 29.00 271.00 560.00 1137.00 1482.00 8793.50
1994 2036.00 1614.50 1016.00 625.00 193.50 16.50 17.50 67.50 152.00 451.50 901.00 1359.00 8450.00
1995 1516.00 1298.50 1033.50 754.50 323.00 55.00 10.50 1.50 234.00 613.50 1181.50 1511.50 8533.00
1996 1887.50 1428.50 1300.00 745.50 366.00 50.50 10.50 5.50 222.00 550.50 1324.00 1767.00 9657.50
1997 1848.50 1353.00 1224.50 742.50 376.50 1.00 35.50 35.00 113.00 489.00 1171.00 1170.50 8560.00
1998 1561.50 1011.00 1165.00 524.00 106.50 123.50 4.00 0.00 87.00 450.50 918.50 1272.00 7223.50
1999 1700.00 1053.50 1012.50 552.41 a 201.50 66.50 3.00 12.00 214.00 537.00 780.00 1274.00 7406.41
2000 1597.53 a 1174.00 798.25 a 619.50 229.50 90.50 27.00 12.00 171.50 481.50 1107.00 1939.00 8247.28
2001 1507.50 1598.00 1262.00 631.50 236.00 65.00 10.50 19.50 217.50 542.50 640.00 1299.00 8029.00
2002 1336.00 1044.30 a 1437.00 716.00 407.00 30.50 2.58 a 26.00 203.50 781.00 1077.00 1285.50 8346.38
2003 1642.00 1481.00 1198.50 616.50 325.00 71.50 0.50 12.50 221.50 520.50 1150.50 1327.50 8567.50
2004 1697.52 b 1371.50 981.00 581.50 385.50 119.00 24.00 112.50 105.00 531.50 887.00 1390.50 8186.52
2005 1650.00 1219.50 1169.50 489.00 387.00 25.50 17.50 29.00 130.00 514.50 930.00 0.00 z 6561.50
2006 0.00 z 1441.50 1140.00 0.00 z 255.00 27.50 0.00 z 15.00 286.50 652.00 989.00 1243.50 6050.00
2007 1452.00 1498.50 900.07 b 674.50 144.00 30.50 9.50 40.00 186.00 438.00 981.00 1644.00 7998.07
2008 1721.50 1581.54 a 1256.50 733.50 344.50 53.00 5.50 8.00 183.50 563.50 984.50 1738.50 9174.04
2009 1898.75 a 1412.44 a 1185.50 662.00 297.50 115.50 42.00 45.50 84.00 747.00 773.50 1622.00 8885.69
2010 1800.50 1533.00 958.50 395.00 299.50 40.50 0.50 6.50 211.50 451.50 975.00 1649.00 8321.00
2011 1831.00 1470.50 1323.00 654.00 315.50 56.00 0.00 4.50 215.50 430.00 929.50 1231.00 8460.50
2012 1372.50 1189.50 701.50 504.00 161.00 33.50 0.00 38.00 226.00 665.00 960.50 1499.50 7351.00
2013 1605.00 1459.50 1380.50 43.50 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 4445.00
Period of Record Statistics
MEAN 1651.30 1373.90 1108.77 595.44 258.76 59.60 10.98 27.50 187.08 510.68 993.22 1462.30 8222.97
S.D. 213.28 184.63 187.74 118.10 89.60 36.73 11.12 22.09 62.20 108.84 144.21 186.34 576.15
SKEW -0.02 -0.15 0.03 -0.11 0.14 0.73 1.51 1.16 0.47 0.12 0.39 0.22 -0.20
MAX 2158.00 2027.50 1541.50 885.00 549.50 176.50 56.00 112.50 415.00 810.00 1440.00 2004.50 9657.50
MIN 1182.00 878.50 633.50 315.50 63.00 1.00 0.00 0.00 69.00 230.00 640.00 1039.03 6369.00
NO YRS 116 118 119 119 119 119 117 116 116 118 118 116 101