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
1959 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
1960 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
1961 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
1962 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
1963 0.00 z 0.00 z 0.00 z 0.00 z 202.50 o 86.50 2.50 62.00 187.00 293.50 890.00 1769.00 3290.50
1964 1497.50 1386.00 1355.00 669.00 254.00 145.00 13.95 a 136.50 279.00 602.50 1024.50 1755.50 9118.45
1965 1882.00 1627.50 1562.00 755.50 321.50 146.50 53.73 a 111.50 482.50 548.50 1065.50 1342.50 9899.23
1966 2068.50 1475.50 1085.50 821.00 486.00 110.50 12.00 102.50 276.50 640.00 1165.00 1610.50 9853.50
1967 1671.00 1081.00 j 1214.00 755.00 524.50 119.00 65.50 106.50 255.00 661.00 1122.50 1508.00 8002.00
1968 1733.50 1596.00 962.00 653.50 427.00 117.00 54.50 76.50 235.50 525.50 1044.00 1633.50 9058.50
1969 1861.50 1374.50 1379.00 650.50 343.50 249.50 61.50 18.50 238.50 715.50 1044.50 1507.50 9444.50
1970 1958.00 1515.50 1409.50 760.00 414.50 80.50 25.50 45.00 268.50 591.50 1102.00 1645.50 9816.00
1971 1992.00 1460.50 1299.50 691.00 434.50 54.00 68.00 95.00 247.50 482.00 1070.00 1579.00 9473.00
1972 1983.00 1724.50 1361.00 815.00 258.50 108.00 18.50 72.50 320.00 724.00 1094.00 1787.50 10266.50
1973 1692.00 1439.50 928.50 735.50 431.00 83.50 32.50 40.50 289.00 428.00 1039.00 1627.50 8766.50
1974 1840.00 1538.50 1328.00 709.00 485.00 139.50 13.00 106.50 407.50 616.00 1010.00 1414.00 9607.00
1975 1735.50 1488.50 1480.50 943.00 262.50 145.00 20.50 77.50 c 331.00 561.00 987.50 1632.50 9665.00
1976 1891.00 1298.27 a 1288.50 572.07 a 395.50 61.00 39.50 74.00 300.50 830.00 1306.50 1923.50 9980.34
1977 2213.92 a 1400.00 1014.50 534.00 e 144.84 b 0.00 z 0.00 z 0.00 z 153.00 o 625.54 c 1133.50 1710.68 a 8776.98
1978 1947.00 0.00 z 1289.27 c 789.31 a 292.50 134.00 86.05 b 82.00 227.50 497.50 g 1072.50 b 1781.50 7701.63
1979 2167.00 1717.00 1292.50 828.62 a 546.63 a 145.00 35.50 109.00 213.10 a 606.50 f 1094.00 1431.00 9579.36
1980 1858.93 b 1107.00 i 743.50 l 641.00 277.00 132.50 28.00 65.50 348.50 597.50 g 1025.00 1636.50 6012.93
1981 1652.00 1287.50 1005.50 458.00 j 390.00 115.50 53.00 59.42 a 0.00 z 0.00 z 0.00 z 0.00 z 4562.92
1982 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
1983 0.00 z 0.00 z 0.00 z 801.00 449.50 e 128.50 13.00 4.50 258.00 630.50 1073.00 2060.50 5418.50
1984 1833.13 a 1183.00 1330.93 a 637.00 418.00 91.00 33.00 34.00 411.50 390.00 f 1114.50 1647.81 b 8733.88
1985 1856.50 1525.48 a 1098.50 624.00 246.00 202.50 44.00 124.50 356.54 d 673.50 1355.50 1980.26 b 10087.28
1986 1650.50 1548.50 1155.50 626.50 330.50 121.00 24.00 103.50 297.00 641.50 1219.50 1451.50 9169.50
1987 1505.00 1099.00 991.00 515.50 240.50 49.14 a 14.50 65.62 a 240.00 753.50 963.50 1410.50 7847.75
1988 1905.43 b 1718.25 a 1207.00 704.46 b 180.50 61.00 16.02 a 52.18 a 273.50 808.50 1114.50 1627.50 9668.85
1989 1679.00 1828.50 1363.00 791.00 353.50 118.00 9.50 69.00 267.50 643.00 1206.50 1898.48 b 10226.98
1990 1388.00 1456.00 1120.50 731.50 454.00 84.00 0.00 z 0.00 z 213.50 696.00 954.00 1640.00 8737.50
1991 1836.50 1354.50 1171.00 652.00 296.50 42.50 39.00 26.50 306.50 693.50 1294.50 1587.00 9300.00
1992 1538.50 1250.50 1180.00 845.00 316.50 185.00 151.00 134.00 275.00 658.50 1120.50 1570.00 9224.50
1993 1787.00 1522.50 1288.50 797.50 405.00 215.50 79.00 75.50 399.50 739.00 1183.00 1574.00 10066.00
1994 2102.00 1695.00 1212.00 795.00 308.50 70.00 39.00 89.50 189.00 522.50 928.00 1399.50 9350.00
1995 1701.00 1563.50 1162.00 907.50 404.50 85.00 33.50 14.00 288.50 644.00 1326.50 1653.50 9783.50
1996 2036.00 1626.50 1491.50 908.50 460.50 118.50 50.00 21.50 239.00 614.50 1312.00 1731.50 10610.00
1997 1921.00 1450.50 1281.00 831.50 536.50 58.00 73.00 103.50 166.50 584.50 1171.50 1271.00 9448.50
1998 1612.00 1030.00 1195.00 588.00 172.00 146.50 12.00 6.50 124.50 532.50 948.50 1390.00 7757.50
1999 1780.00 1222.50 516.00 o 391.50 l 277.50 111.50 16.00 52.00 274.00 590.00 824.50 1373.50 6521.50
2000 1711.00 0.00 z 324.00 s 706.00 g 304.12 b 173.50 34.00 18.00 341.50 498.58 a 1020.00 1893.58 a 5994.29
2001 1554.50 0.00 z 0.00 z 0.00 z 63.50 z 163.97 a 0.00 z 0.00 z 0.00 z 0.00 z 408.50 p 1290.50 3008.97
2002 1465.00 1189.50 1471.00 786.50 523.00 72.50 17.50 38.00 213.00 839.00 1103.00 1357.50 9075.50
2003 1723.50 1542.00 1252.50 713.00 374.50 136.50 32.00 20.50 250.50 573.50 1134.00 1378.00 9130.50
2004 1881.00 1432.50 1112.50 690.50 450.00 181.00 68.50 186.00 145.00 554.50 911.50 1536.00 9149.00
2005 1838.00 1283.00 1241.50 567.00 410.50 30.50 38.00 57.00 161.50 551.00 984.00 1461.50 8623.50
2006 1281.50 1501.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 726.00 1007.50 1290.50 5806.50
2007 1584.50 1616.00 1074.00 751.00 261.00 63.50 26.00 71.50 255.00 497.00 1025.50 1663.00 8888.00
2008 1773.00 1633.50 1349.50 824.00 471.50 126.50 22.50 51.00 231.50 617.00 1020.00 1812.47 a 9932.47
2009 2023.50 1418.00 1237.00 709.50 372.00 168.00 100.50 93.50 103.00 798.00 833.00 1625.50 9481.50
2010 1755.00 1411.08 d 910.00 491.00 335.50 116.00 4.50 25.00 324.00 499.00 1035.00 1655.73 c 8561.82
2011 1855.87 a 1459.23 b 982.00 h 724.50 383.00 141.50 16.57 b 17.00 267.50 473.27 a 968.28 a 1322.00 7628.71
2012 1231.00 f 1236.64 a 746.00 625.00 263.00 68.57 b 0.55 c 45.00 288.62 a 670.24 b 1038.10 a 1097.00 i 4981.73
2013 1322.00 h 1477.00 1364.57 d 41.50 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 2841.57
Period of Record Statistics
MEAN 1787.44 1455.88 1220.49 720.02 362.76 117.07 37.57 67.55 268.18 617.84 1074.04 1592.52 9403.97
S.D. 200.75 176.13 173.57 106.75 100.43 47.71 29.30 39.86 75.67 111.47 122.17 192.35 637.88
SKEW -0.22 -0.28 -0.46 -0.12 -0.12 0.45 1.59 0.53 0.35 -0.22 0.39 0.30 -0.68
MAX 2213.92 1828.50 1562.00 943.00 546.63 249.50 151.00 186.00 482.50 839.00 1355.50 2060.50 10610.00
MIN 1281.50 1030.00 746.00 491.00 144.84 30.50 0.55 4.50 103.00 293.50 824.50 1271.00 7757.50
NO YRS 46 43 42 43 46 47 45 45 45 43 47 47 33