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
1915 1751.00 1203.50 1286.50 464.00 498.00 250.00 129.00 177.50 260.50 613.50 999.83 a 1476.50 9109.83
1916 1785.50 1670.00 1450.00 752.50 444.00 235.50 5.50 101.50 339.50 619.50 1101.50 1706.00 10211.00
1917 1909.50 1768.50 1331.50 863.50 555.00 225.00 80.00 165.00 358.50 943.00 918.50 1830.00 10948.00
1918 0.00 z 1560.00 1074.84 b 790.00 309.00 139.00 84.50 72.50 461.00 593.50 913.50 1259.00 7256.84
1919 1464.50 1444.50 1205.00 704.50 395.00 55.50 18.00 98.50 230.50 721.50 1181.00 1859.48 a 9377.98
1920 1987.10 a 1612.00 1171.50 922.00 383.00 139.00 97.50 125.00 206.00 433.00 1106.50 1397.50 9580.10
1921 1477.00 1292.50 1122.00 578.00 311.55 a 67.50 10.00 78.50 203.57 b 580.00 1205.00 1566.50 8492.12
1922 1858.85 d 777.00 m 1208.50 739.00 203.50 111.50 68.00 78.00 238.00 569.00 850.50 1582.00 7506.85
1923 1610.89 c 1637.00 1501.00 803.50 298.38 c 79.50 21.00 167.92 a 232.00 669.00 0.00 z 0.00 z 7020.18
1924 0.00 z 760.00 k 1305.00 797.07 a 607.50 181.55 a 80.50 134.33 d 370.00 414.76 b 1077.00 e 1823.50 6791.21
1925 0.00 z 1385.50 1142.00 585.50 539.50 149.00 87.50 58.90 a 230.89 b 928.50 1046.50 1580.00 7733.79
1926 1698.00 1469.48 a 1522.00 891.50 366.00 277.00 87.00 104.33 e 400.34 a 712.00 1256.50 1691.50 10475.65
1927 1860.52 a 1392.22 a 1139.00 749.50 495.50 266.00 116.50 209.50 255.50 605.00 1138.00 1830.50 10057.74
1928 1713.94 e 1544.00 1345.50 994.50 375.50 257.07 a 67.00 118.00 394.50 628.00 971.00 1406.50 9815.51
1929 2148.50 1765.00 1181.50 717.50 546.00 236.50 75.50 124.00 370.00 698.00 1203.50 1563.90 b 10629.90
1930 1984.00 a 1295.00 1300.50 720.00 a 382.50 116.50 62.00 27.00 233.28 a 623.10 a 984.50 1457.00 9185.38
1931 1424.50 1180.00 1202.00 678.00 470.00 104.50 55.00 139.00 211.50 518.50 871.00 1248.00 8102.00
1932 1497.00 1601.50 1586.50 814.00 452.50 90.00 92.50 103.00 400.50 777.00 1220.00 1565.50 b 10200.00
1933 1480.00 1693.50 1314.00 822.00 359.50 43.39 b 33.07 a 118.50 213.00 842.00 1191.00 1787.50 9897.46
1934 1512.50 1657.50 1430.65 a 810.50 262.50 111.50 102.96 c 195.50 373.50 587.50 948.50 1721.50 9714.61
1935 1905.95 c 1400.52 a 1229.50 822.50 537.50 275.50 12.50 104.00 357.50 706.28 a 1209.00 1602.70 a 10163.45
1936 1884.50 2042.50 1284.00 976.00 285.95 b 217.00 35.65 a 86.00 230.50 835.00 1211.50 1485.00 10573.60
1937 1952.50 1591.00 1481.50 853.00 403.50 185.17 a 59.00 46.00 335.00 778.00 1137.00 0.00 z 8821.67
1938 1775.27 a 1420.50 1086.00 762.00 388.50 166.50 40.50 60.00 302.50 546.00 1090.00 1587.00 9224.77
1939 1628.00 1791.00 1393.85 d 912.00 295.53 a 120.50 68.00 91.50 328.50 704.50 1077.00 1277.20 a 9687.58
1940 1909.50 1475.50 1540.50 842.00 519.77 a 155.17 a 80.50 123.00 250.00 600.00 1176.50 1520.00 10192.44
1941 1627.00 1498.00 1445.00 580.50 287.00 146.50 95.50 129.50 243.62 a 619.50 1025.17 a 1294.00 8991.29
1942 1552.50 1493.00 1178.52 a 657.00 355.50 f 166.00 129.00 110.50 405.50 653.50 1131.00 1705.00 9181.52
1943 1835.00 1468.50 1569.50 884.00 485.50 125.00 31.52 a 82.00 418.50 660.30 a 1215.00 1494.50 10269.32
1944 1400.68 a 1461.50 1377.50 858.10 a 324.50 104.50 61.00 94.50 300.50 686.13 a 895.00 1579.00 9142.92
1945 1792.50 1524.00 994.00 804.00 582.00 298.00 125.00 110.05 a 358.00 726.00 1119.50 1703.97 a 10137.02
1946 1686.92 a 1529.00 901.00 665.00 484.00 167.00 49.50 126.00 374.00 615.50 1085.50 1558.50 9241.92
1947 1586.00 1536.37 a 1360.50 868.50 562.00 236.50 79.00 47.00 308.50 423.00 1247.00 1569.00 9823.37
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 152.50 69.00 87.50 255.50 647.00 971.50 1547.50 3730.50
1949 1564.50 1505.00 1327.00 731.00 301.50 96.50 39.50 81.50 418.50 569.00 1021.00 1573.50 9228.50
1950 1881.00 1533.26 a 1539.00 1034.00 484.00 170.50 109.50 244.00 345.50 475.00 f 1250.69 a 1767.00 10358.45
1951 1779.00 1479.50 1456.00 826.00 290.50 207.00 78.00 145.70 a 385.34 a 592.10 a 1284.31 a 1576.02 c 10099.47
1952 1675.55 a 1314.84 a 1312.85 a 658.00 369.50 58.50 j 23.50 k 137.36 b 259.82 b 825.12 a 983.79 a 1320.60 a 8857.43
1953 1496.86 c 1458.59 a 1183.50 852.12 d 415.50 129.00 77.50 a 71.00 321.50 478.00 965.00 1493.17 a 8941.73
1954 1808.00 1198.50 1406.50 803.79 a 598.50 112.00 40.50 110.00 349.50 708.00 981.50 1435.50 9552.29
1955 1776.00 1566.00 1479.00 562.00 314.00 149.50 23.50 40.00 335.00 611.22 a 589.50 q 1802.00 8658.22
1956 1696.00 1668.00 1417.00 874.00 459.83 a 106.50 122.00 112.00 405.50 510.98 a 1083.00 1520.03 a 9974.85
1957 1967.50 1526.00 1366.00 778.50 487.22 a 181.55 a 36.50 126.50 410.00 684.00 1079.50 1489.50 10132.77
1958 1540.18 a 1615.50 1246.50 752.00 499.50 334.00 125.00 139.50 309.00 615.50 1047.50 1835.00 10059.18
1959 1991.00 1674.30 a 1310.00 794.00 360.50 158.50 115.50 56.00 290.00 745.00 1390.00 1298.50 10183.30
1960 1701.50 1544.50 1604.50 739.50 455.00 234.50 120.50 76.50 300.50 644.50 1007.50 1647.00 10076.00
1961 1741.50 1271.50 1141.00 871.00 531.50 177.50 60.00 62.50 350.50 625.50 1100.50 1584.50 9517.50
1962 1865.00 1587.50 1230.00 827.00 327.00 206.50 114.50 132.50 396.00 580.00 1018.50 1617.00 9901.50
1963 2036.00 1715.00 1256.50 653.50 524.50 156.00 57.50 148.00 316.50 357.50 0.00 z 1765.50 8986.50
1964 1557.50 1535.00 1409.50 764.50 304.32 a 196.50 49.50 229.50 393.50 689.50 980.50 1765.50 9875.32
1965 1874.50 1708.50 1559.00 853.50 341.00 217.50 152.00 191.50 505.50 661.00 1109.00 1348.50 a 10521.50
1966 2093.50 1531.00 1145.00 865.50 596.00 166.00 41.50 154.50 319.00 676.00 1111.00 1601.50 10300.50
1967 1650.50 1727.50 1269.00 741.00 580.50 156.50 111.00 189.50 368.50 728.50 1153.93 b 1482.00 10158.43
1968 1769.00 1607.50 1027.50 710.00 491.00 209.50 96.50 144.00 314.00 589.00 1035.00 1589.00 9582.00
1969 1793.00 1456.50 1361.50 708.62 a 393.50 340.50 94.00 44.00 329.00 756.00 1075.00 1466.50 9818.12
1970 1967.00 1564.00 1406.00 735.00 440.50 106.50 64.50 83.50 327.00 584.50 1111.00 1588.50 9978.00
1971 1987.50 1514.00 1373.50 754.50 536.00 102.00 104.88 a 156.50 310.00 468.50 1053.00 1551.00 9911.38
1972 2013.00 1741.00 1423.00 892.00 308.00 201.00 95.00 127.50 370.00 782.50 1081.00 1754.00 10788.00
1973 1667.50 1396.00 930.50 769.50 528.00 90.00 52.50 0.00 z 335.00 485.50 1045.50 1606.00 8906.00
1974 1801.50 1583.00 1275.00 766.50 516.50 243.00 29.00 131.00 496.50 697.50 994.50 1412.50 9946.50
1975 1674.00 1462.00 1438.50 930.52 a 323.00 168.50 54.00 105.50 406.50 571.00 950.00 1609.00 9692.52
1976 1879.50 1316.00 1310.50 648.00 469.00 88.50 50.00 128.00 377.40 e 850.00 1321.00 1935.50 10373.40
1977 2148.50 1414.50 1003.00 586.00 167.50 155.50 41.33 a 210.50 304.50 682.53 b 1087.50 1602.50 9403.87
1978 1911.50 1645.50 1324.00 795.50 367.00 195.52 a 88.50 86.00 232.00 656.88 b 0.00 z 1739.50 9041.90
1979 2118.50 1690.00 1285.50 838.00 547.00 193.00 56.50 120.00 301.50 772.79 c 0.00 z 1431.17 a 9353.95
1980 1786.12 a 1609.00 1403.50 690.50 309.50 175.00 52.00 72.50 369.50 789.50 1060.50 1599.00 9916.62
1981 1679.50 1327.00 1173.72 b 698.00 455.00 135.50 62.50 69.50 344.00 758.47 a 901.00 1557.50 9161.69
1982 2077.00 1570.00 1317.50 859.00 252.00 0.00 z 0.00 z 138.00 339.00 603.00 1140.00 1350.00 9645.50
1983 1579.50 1181.00 1084.00 847.00 539.50 173.50 24.50 17.00 287.50 654.00 1009.50 1936.97 b 9333.97
1984 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 47.00 397.50 0.00 z 0.00 z 0.00 z 444.50
1985 0.00 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 0.00 z 0.00 z 0.00 z 0.00
1986 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 42.00 135.50 311.00 704.50 1174.50 1420.00 3787.50
1987 1543.50 1180.50 1013.00 587.50 317.00 93.50 36.00 98.00 268.00 831.50 946.00 1319.50 8234.00
1988 1870.00 1720.00 1208.50 719.00 258.00 98.00 35.00 67.50 295.50 829.50 1019.50 1579.50 9700.00
1989 1554.00 1736.00 1384.50 822.00 405.50 177.00 33.00 77.00 0.00 z 0.00 z 1062.50 1883.50 9135.00
1990 1418.00 1426.50 1126.50 717.50 470.00 112.00 77.00 83.00 263.00 743.00 970.00 1569.50 8976.00
1991 1824.50 1345.50 1162.00 636.00 284.50 51.50 75.00 62.50 366.50 722.00 1289.50 1525.50 9345.00
1992 1535.00 1295.50 1190.00 826.00 352.00 199.50 164.00 189.50 355.50 715.50 1089.50 1509.00 9421.00
1993 1718.50 1440.00 1208.00 836.50 415.50 222.50 54.50 89.00 491.50 771.00 1177.50 1475.00 9899.50
1994 2058.50 1622.50 1172.00 807.00 386.00 97.00 67.50 140.50 226.50 567.00 952.50 1386.50 9483.50
1995 1631.50 1477.50 1126.50 898.50 419.50 91.00 45.00 28.50 377.00 637.00 1352.00 1640.50 9724.50
1996 1892.00 1574.00 1468.00 911.00 465.00 132.50 101.50 63.50 281.00 636.00 1260.00 1609.00 10393.50
1997 1785.50 1370.50 1244.00 796.50 548.50 68.50 84.50 148.50 224.50 608.00 1164.00 1267.50 9310.50
1998 1488.50 962.00 1133.50 576.50 209.50 152.50 29.50 21.50 181.50 558.00 934.50 1377.50 7625.00
1999 1752.50 1146.00 1098.50 578.50 289.00 150.52 a 17.00 75.50 307.00 653.00 858.50 1396.50 8322.52
2000 1669.98 d 1229.00 950.48 c 747.50 246.50 h 199.50 45.50 44.50 282.50 524.50 1056.50 1852.00 8601.96
2001 1512.80 a 1551.50 1231.00 620.50 313.00 136.55 a 44.00 60.00 300.00 674.00 718.50 1265.32 a 8427.17
2002 1408.00 1187.00 1382.00 769.50 505.00 99.50 13.50 50.00 235.50 0.00 z 1104.50 1358.00 8112.50
2003 1727.00 1562.30 a 1208.50 740.50 375.50 141.50 69.50 25.00 292.50 650.50 1113.00 1388.00 9293.80
2004 1835.72 a 1350.17 c 1134.50 709.00 0.00 z 0.00 z 4.50 z 222.50 147.00 567.50 924.00 1542.50 8432.89
2005 1726.50 1245.00 1289.00 562.00 453.50 41.00 63.00 84.50 188.50 553.00 1000.00 1500.00 8706.00
2006 1280.00 1439.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 32.50 359.00 0.00 z 955.50 1281.50 5348.00
2007 1529.50 1601.50 1010.50 744.50 269.00 76.50 42.50 65.00 241.50 498.50 1048.00 1599.00 8726.00
2008 1687.50 1590.50 1343.50 781.00 474.00 130.50 29.00 77.50 224.50 640.50 1045.50 1736.00 9760.00
2009 1970.50 1372.00 1166.50 719.00 389.00 193.00 0.00 z 126.00 158.50 790.50 812.50 1597.50 9295.00
2010 1649.50 1360.50 902.00 484.00 337.00 128.00 7.00 30.00 322.20 e 554.00 995.00 1559.00 8328.20
2011 1773.00 1402.59 a 1256.50 754.00 411.78 a 121.50 10.85 a 43.50 305.00 515.50 920.50 1369.00 8883.73
2012 1497.00 1213.00 705.00 652.00 267.50 98.50 5.00 98.00 321.00 493.00 h 0.00 z 0.00 z 4857.00
Period of Record Statistics
MEAN 1742.71 1489.58 1264.20 762.23 410.10 158.21 65.27 104.81 316.64 650.82 1068.34 1558.42 9614.36
S.D. 194.46 178.07 172.17 110.64 105.22 63.49 35.52 50.48 73.94 111.75 124.47 167.77 676.63
SKEW 0.03 -0.17 -0.39 -0.32 -0.04 0.56 0.42 0.55 0.10 0.07 0.10 0.18 -0.63
MAX 2148.50 2042.50 1604.50 1034.00 607.50 340.50 164.00 244.00 505.50 943.00 1390.00 1936.97 10948.00
MIN 1280.00 962.00 705.00 464.00 167.50 41.00 5.00 17.00 147.00 357.50 718.50 1248.00 7625.00
NO YRS 91 92 93 93 90 91 91 96 96 91 90 93 72