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
1904 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 34.50 n 83.00 128.00 300.00 596.00 873.50 1489.00 3469.50
1905 1854.00 1551.00 998.00 704.00 451.00 135.00 43.50 31.00 156.50 704.50 971.50 1500.00 9100.00
1906 1517.00 1500.00 1417.50 525.00 411.00 111.50 31.00 60.50 137.00 641.00 1040.50 1534.50 8926.50
1907 1914.50 1448.50 1216.00 904.50 654.00 129.00 25.50 66.50 298.50 651.00 1015.00 1404.00 9727.00
1908 1542.00 1338.00 1203.50 602.50 367.87 a 134.50 28.50 77.00 134.00 560.00 934.00 1463.50 8385.37
1909 1647.50 1443.00 1159.50 872.00 420.00 94.00 28.00 23.00 247.00 650.00 891.43 b 1684.50 9159.93
1910 1672.50 1602.00 751.50 502.50 425.50 119.00 26.50 80.50 230.00 485.50 1157.00 1573.00 8625.50
1911 1799.00 1304.00 978.00 679.00 247.50 19.50 47.00 89.00 235.50 681.00 1342.50 1417.00 8839.00
1912 2274.50 1582.50 1408.50 584.50 293.00 155.50 27.50 93.50 303.33 c 592.10 a 988.50 1380.00 9683.43
1913 1735.50 1585.50 1313.37 a 570.50 410.00 92.50 30.00 25.50 282.00 687.17 a 840.50 1172.00 8744.53
1914 1481.50 1724.00 1161.50 717.00 272.50 93.50 9.50 84.00 196.00 401.00 1024.00 1759.77 a 8924.27
1915 1710.50 1199.50 1147.00 371.50 458.50 182.50 75.43 a 102.00 276.00 539.50 997.00 1452.50 8511.93
1916 1959.00 1738.00 1384.00 678.00 356.50 167.00 0.00 69.00 296.00 651.50 1017.93 a 1747.00 10063.93
1917 1921.00 1710.50 1142.50 608.00 f 418.50 175.50 23.00 80.50 254.50 891.50 851.00 1827.00 9295.50
1918 1947.00 1412.00 905.00 699.50 279.50 35.50 19.50 23.00 406.50 555.50 851.50 1245.00 8379.50
1919 1426.50 1453.50 1189.00 648.00 321.00 63.50 2.00 47.00 164.50 704.50 1203.50 1756.00 8979.00
1920 1879.00 1504.50 1154.00 849.00 265.50 97.00 21.00 49.50 140.00 399.00 1051.50 1348.00 8758.00
1921 1468.00 1230.00 1066.00 522.50 283.00 50.00 3.00 31.00 167.50 519.00 1214.00 1469.50 8023.50
1922 1714.00 1636.00 948.50 f 673.50 140.00 53.50 31.00 29.50 181.50 481.50 859.00 1571.50 7371.00
1923 1580.00 1650.50 1437.00 718.00 280.50 43.00 1.50 75.00 167.50 589.50 818.50 1205.50 8566.50
1924 1858.00 1317.50 1116.50 686.50 505.50 128.79 a 39.00 82.00 292.00 400.00 1053.50 1812.50 9291.79
1925 1686.00 1311.50 999.50 462.50 429.50 109.50 48.00 14.50 186.50 903.50 1060.00 1558.00 8769.00
1926 1603.22 a 1281.50 1289.50 705.00 210.50 148.00 25.00 35.50 325.00 615.50 1199.50 1563.84 c 9002.06
1927 1711.50 1273.00 979.50 632.50 409.00 135.50 34.00 83.50 229.00 558.50 1190.00 1877.00 9113.00
1928 1694.50 1428.50 1117.00 822.50 226.50 169.00 16.50 56.00 307.00 546.50 906.00 1354.50 8644.50
1929 2078.00 1613.50 1051.00 609.00 442.00 140.00 20.00 36.00 315.50 566.50 1125.00 1546.00 9542.50
1930 1917.00 1177.04 a 1105.50 565.50 301.00 48.50 16.00 14.50 221.00 621.00 942.00 1418.25 a 8347.29
1931 1382.50 1105.00 1100.50 554.00 384.50 54.00 9.50 47.00 115.00 420.50 860.00 1164.50 7197.00
1932 1522.50 1412.50 1378.50 666.50 275.50 14.00 18.50 7.00 249.00 674.50 1113.00 1606.00 8937.50
1933 1445.00 1548.50 1131.00 703.00 293.00 22.00 1.00 23.00 104.50 654.50 1123.00 1621.00 8669.50
1934 1463.50 1427.00 1215.50 666.00 123.50 47.50 10.00 82.15 a 282.00 450.50 870.50 1638.50 8276.65
1935 1829.50 1183.00 1098.00 721.50 418.00 160.50 0.00 78.50 258.00 623.00 1201.00 1536.00 9107.00
1936 1951.50 1978.00 1190.40 a 858.00 210.50 103.00 2.00 42.00 169.50 721.00 1166.50 1443.50 9835.90
1937 1979.50 1537.50 1305.00 724.00 298.50 115.00 16.00 11.00 252.50 704.50 1086.50 1612.00 9642.00
1938 1726.00 1306.50 986.50 669.50 389.00 68.50 8.00 18.50 190.00 451.50 1103.50 1489.00 8406.50
1939 1559.00 1669.50 1296.50 808.00 246.00 88.50 19.00 33.50 231.50 643.50 932.00 1229.50 8756.50
1940 1874.98 a 1384.00 1396.50 804.00 404.50 123.50 29.00 108.00 192.50 485.00 1203.00 1466.50 9471.48
1941 1621.00 1465.00 1278.50 506.00 223.00 123.00 30.50 62.50 222.50 563.00 971.50 1321.50 8388.00
1942 1481.00 1355.50 998.00 505.00 426.50 128.50 51.00 46.50 345.00 611.22 a 1079.50 1634.50 8662.22
1943 1863.00 1404.50 1431.50 714.50 399.00 99.50 7.00 29.00 303.00 566.00 1173.50 1411.00 9401.50
1944 1320.00 1379.00 1271.50 751.00 254.00 77.00 14.50 47.50 216.50 534.00 869.50 1492.50 8227.00
1945 1707.00 1387.00 899.00 708.50 473.50 219.00 49.00 40.50 316.50 646.00 1110.50 1689.00 9245.50
1946 1646.00 1491.50 877.50 559.50 433.50 127.00 17.50 77.00 280.00 550.50 1074.00 1551.00 8685.00
1947 1521.50 1503.00 1234.50 787.00 446.50 154.50 7.50 9.50 254.50 273.50 1231.00 1512.50 8935.50
1948 1809.00 1542.50 1252.00 518.00 287.50 70.34 a 15.00 16.00 119.50 507.50 981.00 1554.00 8672.34
1949 1621.00 1503.00 1227.50 572.00 204.50 29.00 2.58 a 33.00 270.50 478.00 910.50 1481.50 8333.08
1950 1919.00 1431.50 1363.00 921.00 390.50 77.00 20.50 88.50 167.50 441.50 1134.00 1712.50 9666.50
1951 1793.50 1385.50 1358.00 712.00 183.00 127.50 12.40 a 45.50 295.00 574.00 1244.50 1557.00 9287.90
1952 1707.50 1267.50 1278.50 518.00 254.00 36.50 6.00 34.50 188.50 689.50 943.00 1302.00 8225.50
1953 1581.50 1405.00 1135.50 760.00 294.00 57.00 18.00 10.00 201.50 342.00 866.50 1450.80 a 8121.80
1954 1806.00 1030.30 a 1195.00 630.50 455.00 50.00 12.00 25.50 229.00 614.50 867.50 1345.50 8260.80
1955 1656.50 1501.00 1324.00 415.00 166.50 48.50 0.00 6.50 200.50 498.00 1223.00 1700.50 8740.00
1956 1657.00 1523.50 1279.00 765.50 293.00 45.50 26.00 31.00 283.00 351.00 988.00 1367.50 8610.00
1957 1825.50 1354.50 1196.00 621.00 307.00 71.00 0.00 25.50 245.00 570.50 999.00 1315.00 8530.00
1958 1425.50 1437.50 1064.00 588.00 255.00 182.00 34.00 56.50 160.50 486.50 968.50 1630.50 8288.50
1959 1786.63 a 1415.00 1050.00 618.50 228.50 52.50 11.50 10.00 205.00 681.50 1271.50 1199.00 8529.63
1960 1638.00 1440.50 1409.98 a 641.50 274.50 84.50 11.50 10.00 211.00 513.00 963.50 1519.50 8717.48
1961 1672.50 1153.50 947.00 791.00 350.50 61.00 13.00 11.37 a 273.00 536.50 1056.00 1559.00 8424.37
1962 1797.50 1489.50 1175.50 720.50 218.50 92.00 25.00 24.50 262.50 477.00 922.00 1439.50 8644.00
1963 1934.00 1503.00 1005.50 573.50 328.00 56.50 4.50 42.50 163.50 318.50 880.50 1752.00 8562.00
1964 1487.00 1297.50 1285.50 607.50 208.50 111.50 1.50 72.50 238.50 547.50 970.50 1707.00 8535.00
1965 1835.00 1565.50 1484.50 705.00 229.50 65.50 20.50 57.00 424.50 497.50 1027.50 1291.00 9203.00
1966 2008.00 1433.00 1013.00 751.00 407.00 68.00 2.50 77.50 218.50 583.50 1113.00 1554.00 9229.00
1967 1615.00 1624.00 1169.50 662.00 449.00 79.00 45.00 64.50 182.00 584.00 1062.50 1434.50 8971.00
1968 1680.00 1560.00 886.00 566.50 375.00 85.00 43.00 56.00 189.00 484.50 981.50 1586.50 8493.00
1969 1794.50 1360.00 1293.00 587.00 261.50 186.50 23.00 6.00 206.00 680.50 1033.00 1465.50 8896.50
1970 1905.00 1490.50 1347.50 680.00 342.00 64.50 13.00 31.50 254.50 577.50 1077.50 1577.50 9361.00
1971 1924.00 1433.00 1245.50 626.50 390.50 44.50 66.50 85.50 237.00 436.50 1018.50 1546.00 9054.00
1972 1960.00 1683.00 1309.50 776.50 248.00 98.00 47.00 70.00 275.50 673.50 1010.00 1735.50 9886.50
1973 1606.50 1311.00 861.00 663.50 378.50 60.50 19.00 14.00 254.50 426.00 984.00 1572.00 8150.50
1974 1746.50 1438.50 1214.00 621.00 397.00 107.50 8.00 92.50 339.00 546.00 968.50 1350.00 8828.50
1975 1679.50 1433.00 1360.00 847.50 215.00 99.50 23.50 35.00 291.50 493.00 959.00 1540.50 8977.00
1976 1807.50 1196.50 1188.50 506.50 308.50 26.50 11.00 45.50 238.00 738.50 1241.25 b 1770.50 9078.75
1977 2037.00 1271.00 914.50 433.00 109.00 59.50 8.50 108.50 207.50 568.00 1063.50 1616.50 8396.50
1978 1850.00 1530.50 1161.00 671.00 244.50 116.00 49.50 54.77 a 204.00 551.28 a 1109.00 1705.00 9246.55
1979 2050.00 1628.00 1223.50 753.00 455.00 107.00 28.50 87.00 226.00 674.00 1089.50 1358.00 9679.50
1980 1703.00 1516.00 0.00 z 559.00 222.00 101.00 18.00 25.00 0.00 z 706.36 c 984.50 1522.00 7356.86
1981 1563.50 1253.50 957.00 570.00 349.00 94.00 35.00 39.00 278.50 731.50 668.00 i 1645.50 7516.50
1982 2207.50 1570.50 1320.00 779.00 193.50 207.50 7.75 a 102.00 354.00 639.50 1172.59 a 1374.50 9928.34
1983 0.00 z 1173.00 1061.50 750.00 448.50 106.50 17.10 b 9.50 295.50 693.50 1105.00 2127.00 7787.10
1984 1845.00 1226.50 1363.00 696.50 441.50 121.00 69.00 69.50 525.50 706.05 b 1264.50 1785.50 10113.55
1985 1986.50 1678.92 b 1147.00 539.50 233.00 206.50 46.50 a 147.00 370.00 c 738.50 1339.62 d 1985.19 e 10418.23
1986 1675.00 1560.50 1102.00 618.00 346.00 148.50 38.00 160.50 360.54 b 703.38 b 1290.50 1547.00 9549.92
1987 1604.77 a 1149.50 1023.00 529.00 294.50 68.79 a 26.50 147.77 a 0.00 z 0.00 z 0.00 z 1549.00 6392.83
1988 1593.00 g 0.00 z 1256.50 0.00 z 270.00 111.50 60.97 a 39.78 a 224.50 790.50 1076.50 1572.00 5402.25
1989 1601.50 1747.00 1296.50 728.50 339.00 101.00 5.00 55.00 266.50 642.00 1224.83 a 1858.00 9864.83
1990 1413.00 1410.00 1069.50 702.00 442.00 97.00 58.00 61.50 215.50 698.00 978.50 1622.00 8767.00
1991 1798.00 1275.50 1100.00 591.50 256.50 36.00 40.00 28.00 304.00 699.00 1313.00 1535.50 8977.00
1992 1512.50 1183.00 186.50 y 0.00 z 255.50 132.50 106.50 0.00 z 272.50 634.50 1067.50 1471.00 6635.50
1993 1700.50 1410.50 1167.50 708.00 327.50 134.50 25.00 36.50 392.50 667.00 1150.50 1482.50 9202.50
1994 2028.50 1602.50 1046.50 655.00 268.50 61.50 19.50 77.00 157.50 502.00 903.50 1412.00 8734.00
1995 1628.50 1470.00 1073.50 800.00 320.50 61.50 27.50 13.00 274.00 611.00 1285.50 1593.00 9158.00
1996 1929.50 1544.50 1394.50 820.00 383.00 105.50 43.00 0.00 z 0.00 z 616.00 1266.00 1703.00 9805.00
1997 1816.00 1352.50 1197.00 746.00 465.00 34.00 59.50 90.50 177.50 578.50 1172.50 1233.50 8922.50
1998 1554.00 988.50 1092.00 0.00 z 159.00 143.00 0.00 z 8.00 0.00 z 0.00 z 913.50 0.00 z 4858.00
1999 1785.50 1174.50 1033.00 616.00 245.50 116.50 7.00 24.50 281.50 645.50 818.00 1338.50 8086.00
2000 1678.50 1239.50 882.98 a 683.50 304.00 145.71 b 25.32 a 27.50 269.50 531.50 1059.50 1908.00 8755.51
2001 1522.00 1643.50 1259.00 659.00 0.00 z 99.00 23.00 14.50 251.00 621.50 690.00 1259.00 8041.50
2002 0.00 z 1168.50 1457.00 742.00 492.00 71.00 11.50 28.50 209.00 821.00 1072.50 1336.00 7409.00
2003 1672.00 1535.00 1221.50 691.00 354.50 118.50 21.00 15.00 254.00 577.50 1096.00 1338.50 8894.50
2004 1827.00 1408.00 1059.50 647.50 444.00 164.00 66.65 a 155.50 138.50 554.50 912.50 1496.50 8874.15
2005 1779.50 1238.50 1224.50 546.00 403.00 16.50 29.50 46.50 0.00 z 536.50 957.00 1462.00 8239.50
2006 1263.00 1460.00 1056.50 480.50 305.50 57.00 2.50 13.50 287.00 705.00 982.50 1242.50 7855.50
2007 1544.50 1587.00 1029.00 682.00 220.50 45.00 18.00 56.00 230.50 460.50 995.50 1634.00 8502.50
2008 1746.00 1615.00 1298.50 754.00 408.50 85.50 2.50 38.00 211.50 574.50 979.00 1759.00 9472.00
2009 2015.50 1374.50 1191.00 669.50 337.50 144.00 63.00 75.50 99.50 773.00 800.00 1583.50 9126.50
2010 1734.50 1386.50 895.50 445.50 305.50 83.50 0.50 24.00 305.50 504.50 1000.00 1637.50 8323.00
2011 1799.00 1415.00 1291.00 699.50 342.50 118.50 4.00 10.00 263.00 473.50 927.50 1276.50 8620.00
2012 1446.00 1176.00 739.87 a 580.00 220.50 49.00 0.00 46.50 257.50 673.00 986.00 1434.00 7608.37
2013 1641.00 1449.00 1346.43 a 39.50 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 4436.43
Period of Record Statistics
MEAN 1727.57 1427.53 1166.50 658.87 326.03 96.86 24.48 51.06 244.43 586.13 1040.18 1527.48 8876.92
S.D. 190.54 170.15 162.10 109.97 97.06 45.93 20.50 34.93 70.83 114.25 134.91 181.00 563.76
SKEW 0.14 0.01 -0.31 -0.10 0.23 0.40 1.25 0.99 0.66 -0.04 0.19 0.37 0.18
MAX 2274.50 1978.00 1484.50 921.00 654.00 219.00 106.50 160.50 525.50 903.50 1342.50 2127.00 10418.23
MIN 1263.00 988.50 739.87 371.50 109.00 14.00 0.00 6.00 99.50 273.50 690.00 1164.50 7197.00
NO YRS 106 108 106 104 107 108 108 107 104 107 107 108 95