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
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 92.00 19.50 27.50 145.50 613.28 a 841.50 1381.00 3120.28
1949 1447.00 1351.00 1280.50 330.00 i 302.00 53.79 a 7.00 44.20 d 303.00 476.00 992.00 1407.50 7664.00
1950 1623.50 1367.50 1308.00 975.00 399.00 112.50 73.50 128.50 237.41 a 449.00 1084.00 1536.00 9293.91
1951 1623.76 b 1334.31 b 1182.50 710.50 183.50 162.50 41.50 97.50 307.00 543.00 1198.50 1460.50 8845.07
1952 1536.64 b 1285.00 1264.00 541.07 b 318.50 76.00 34.00 54.00 255.50 713.50 922.00 1221.00 8221.21
1953 1385.50 1338.00 1110.00 774.31 a 355.97 b 73.00 53.50 20.50 218.00 415.00 813.50 1309.50 7866.78
1954 1571.50 1082.67 a 1227.00 653.50 530.00 84.50 29.00 81.00 284.00 579.50 888.50 1335.58 a 8346.75
1955 1578.93 a 1385.50 1269.00 514.00 263.00 68.28 a 4.02 d 17.00 226.50 535.50 1067.00 1531.00 8459.73
1956 1461.50 1422.50 1319.00 823.85 d 397.00 112.78 c 48.00 60.50 317.00 386.00 966.00 1354.18 a 8668.31
1957 1833.43 c 1262.50 1141.50 661.50 367.87 a 101.00 6.20 a 61.47 b 278.28 a 557.00 938.50 1352.00 8561.24
1958 1423.93 a 1371.50 1076.50 659.00 381.50 205.50 40.00 57.50 180.00 469.81 b 907.00 1656.95 a 8429.19
1959 1797.50 1502.00 1241.00 659.50 218.11 c 55.50 36.50 3.10 a 201.50 659.50 1190.17 a 1130.93 d 8695.31
1960 1425.50 1320.00 1452.50 666.50 376.50 166.00 57.50 48.50 237.50 585.79 b 869.50 1477.50 8683.29
1961 1560.00 1161.00 1072.00 792.50 448.00 105.50 28.00 35.50 232.00 512.00 964.50 1456.00 8367.00
1962 1689.00 1468.00 1152.50 724.00 260.50 114.50 54.50 64.50 327.00 443.50 893.00 1371.00 8562.00
1963 1791.00 1523.00 1090.00 581.50 353.50 75.00 19.50 66.50 212.50 232.00 751.00 1515.00 8210.50
1964 1333.00 1251.00 1133.50 645.50 186.50 113.50 24.00 107.00 276.50 557.00 829.00 1442.00 7898.50
1965 1554.00 1405.70 a 1285.00 764.50 232.50 123.00 52.00 58.50 295.50 502.00 911.50 1124.00 8308.20
1966 1666.50 1201.00 995.50 707.00 443.50 77.50 4.00 58.00 229.50 594.00 936.72 a 1408.00 8321.22
1967 1458.00 1560.00 1194.50 692.00 502.50 82.50 65.50 126.00 234.83 a 605.50 1043.50 1354.00 8918.83
1968 1615.50 1447.00 916.50 634.00 426.50 124.00 50.50 88.50 170.00 481.00 919.50 1392.00 8265.00
1969 1592.50 1291.50 1247.50 647.50 322.00 209.50 39.50 13.50 247.50 598.00 1020.00 1367.50 8596.50
1970 1744.00 1432.50 1213.00 644.50 322.00 60.00 36.00 42.50 188.79 a 481.00 970.50 1381.00 8515.79
1971 1790.50 1412.50 1258.00 714.50 419.50 72.00 73.50 73.50 184.00 353.50 914.00 1340.75 a 8606.25
1972 1771.00 1566.00 c 1297.87 a 847.00 213.00 119.00 49.00 61.00 220.50 695.50 960.50 1511.50 9311.87
1973 1440.50 1285.00 882.50 680.50 494.50 33.50 9.00 24.00 216.00 364.50 954.00 1366.50 7750.50
1974 1579.00 1436.50 1165.00 654.50 412.00 140.50 16.00 52.00 377.50 545.94 d 871.50 1262.50 8512.94
1975 1475.50 1359.00 0.00 z 869.50 224.00 93.50 27.00 28.50 318.50 490.00 844.00 1409.00 7138.50
1976 1743.50 1216.00 1165.00 599.00 400.50 42.00 0.00 z 74.50 293.00 721.00 1159.50 1705.00 a 9119.00
1977 1887.00 1273.00 976.00 589.29 b 142.50 130.00 13.00 101.50 203.00 545.50 936.50 1427.50 8224.79
1978 1593.50 1453.00 1223.00 755.69 a 280.00 134.00 79.05 a 40.50 205.00 621.00 1037.14 b 1505.57 a 8927.45
1979 1860.50 1596.50 1153.89 d 788.79 a 452.00 116.38 a 33.58 a 72.50 0.00 z 692.00 1023.00 1240.00 9029.14
1980 1538.50 1480.50 1260.50 655.50 258.00 122.00 11.88 a 8.00 255.50 685.00 935.50 1484.26 b 8695.14
1981 1599.50 1212.30 a 0.00 z 645.00 c 0.00 z 0.00 z 0.00 z 21.18 a 275.69 a 698.00 832.50 1321.50 6605.67
1982 1841.00 1441.00 1161.50 806.50 178.50 220.00 14.00 112.50 307.50 533.50 1004.00 1220.50 8840.50
1983 1439.50 1101.00 1052.50 771.00 524.00 125.50 17.00 10.00 248.00 580.00 909.50 1716.00 8494.00
1984 1700.00 1084.00 1331.00 646.00 465.50 62.00 43.00 32.00 317.00 524.00 957.00 1353.00 8514.50
1985 1628.00 1384.00 985.00 601.50 250.50 170.00 56.00 109.50 151.00 m 0.00 z 0.00 z 0.00 z 5184.50
1986 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 156.00 80.50 165.50 285.50 639.00 1150.71 b 1346.00 3823.21
1987 1428.50 1146.50 1016.00 548.00 348.00 0.00 z 45.47 a 0.00 z 0.00 z 797.00 0.00 z 1246.00 6575.47
1988 1758.73 a 1532.50 1195.50 0.00 z 272.50 109.00 28.00 82.50 264.00 781.50 0.00 z 0.00 z 6024.23
1989 1444.00 1524.50 1352.00 789.00 402.50 169.50 33.50 35.50 h 0.00 z 0.00 z 1161.50 1783.00 8659.50
1990 1319.00 1347.00 1089.50 633.00 465.50 140.00 78.50 39.50 n 272.50 713.00 896.50 1461.00 8415.50
1991 0.00 z 1230.96 a 1106.00 0.00 z 285.56 e 66.50 69.50 38.00 n 367.50 682.50 1159.00 1397.50 6365.02
1992 1435.00 0.00 z 1188.50 812.50 384.00 205.50 154.00 53.00 s 345.00 697.00 1108.50 1405.50 7735.50
1993 1607.50 1403.50 1134.00 836.50 379.50 176.00 45.00 51.50 r 424.50 734.50 1104.00 1373.30 a 9218.30
1994 1914.50 1552.00 1121.00 738.00 370.50 101.50 56.50 120.00 218.50 300.00 q 910.00 1277.50 8380.00
1995 1482.50 1375.50 1107.00 898.50 409.00 80.00 51.00 17.00 122.00 q 211.50 t 1276.00 1584.50 8281.00
1996 1735.50 1526.00 1382.00 872.00 482.00 150.00 88.00 59.00 27.00 t 485.00 i 1186.00 1436.00 8916.50
1997 1639.50 1297.50 1230.50 785.00 434.50 i 91.00 75.50 164.50 92.00 q 290.50 r 1072.00 1207.50 7563.00
1998 1426.00 1012.50 1108.50 618.50 232.50 179.50 39.50 30.00 72.00 r 238.50 s 902.50 1293.00 6842.50
1999 1665.50 1222.50 1108.00 639.00 234.00 g 140.50 23.00 69.20 c 200.50 h 155.50 w 845.40 e 1413.50 7126.60
2000 1636.50 1281.50 911.50 749.00 262.50 g 92.00 f 18.00 f 52.50 245.50 i 146.00 w 827.00 g 1696.50 6327.50
2001 1412.00 1399.50 1184.50 578.08 d 283.28 b 38.00 j 49.60 a 19.08 e 209.00 f 376.50 n 540.00 i 1206.00 6132.03
2002 1319.50 1140.00 1299.50 750.00 520.50 52.00 l 19.50 35.50 150.50 l 742.50 1063.00 1325.00 8215.00
2003 1636.00 1534.00 1206.50 785.00 272.00 i 144.00 g 42.00 25.50 g 230.00 f 392.50 n 816.00 f 1271.50 6475.00
2004 1743.00 1335.00 760.50 i 516.00 h 286.50 j 160.50 71.50 98.50 i 103.00 f 432.00 h 728.00 g 1221.50 f 3310.00
2005 1726.00 1170.50 942.00 g 471.50 f 251.50 h 32.00 33.00 10.50 f 175.50 292.00 k 1059.00 e 1433.00 5629.00
2006 1279.00 1376.50 1090.88 b 610.00 c 349.50 111.00 17.50 51.50 281.00 537.00 i 876.00 1229.00 7271.88
2007 1419.00 1478.50 1070.57 b 734.00 289.50 46.03 a 40.54 e 43.50 175.50 f 300.50 g 1019.00 1462.96 e 7603.60
2008 1516.42 a 1517.00 0.00 z 484.50 h 286.00 h 50.00 i 22.50 45.00 163.00 g 461.50 h 987.50 1751.00 5839.42
2009 1313.00 i 372.50 t 1171.05 b 741.00 397.00 165.00 72.50 100.50 168.50 747.50 804.00 1490.67 b 5857.72
2010 1462.54 c 1224.00 681.50 g 530.50 282.50 116.50 12.50 28.50 338.50 566.50 960.50 1452.35 a 6974.89
2011 1621.50 1383.76 c 883.50 h 385.00 p 56.00 z 5.50 z 4.00 p 22.73 a 317.07 a 541.98 a 910.20 e 966.00 h 4797.25
2012 0.00 z 0.00 z 391.00 n 143.50 x 236.63 a 85.50 9.82 a 51.00 291.92 d 459.00 h 0.00 z 0.00 z 674.87
Period of Record Statistics
MEAN 1587.12 1351.24 1166.48 704.43 346.21 114.22 41.39 59.65 260.74 576.69 977.32 1406.17 8513.30
S.D. 156.70 138.78 119.42 100.55 99.86 46.47 26.76 37.87 60.13 122.41 116.05 144.77 354.87
SKEW 0.13 -0.34 -0.21 0.32 -0.02 0.34 1.28 0.89 0.34 -0.37 0.53 0.61 0.12
MAX 1914.50 1596.50 1452.50 975.00 530.00 220.00 154.00 165.50 424.50 797.00 1276.00 1783.00 9311.87
MIN 1279.00 1012.50 882.50 514.00 142.50 32.00 4.00 3.10 145.50 232.00 751.00 1124.00 7750.50
NO YRS 60 60 55 55 54 57 61 56 49 48 57 60 31