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
1958 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 359.00 h 940.34 a 1601.50 2541.84
1959 1746.00 1383.93 a 1043.15 a 601.50 241.00 69.31 a 18.50 8.50 199.50 687.68 a 1262.00 1177.50 8438.57
1960 1573.00 1426.00 1408.50 611.00 266.50 99.00 17.50 11.00 136.00 o 455.50 872.50 1431.00 8171.50
1961 1562.00 1103.00 953.00 751.50 317.00 45.00 6.72 a 7.50 213.50 412.30 a 940.34 a 1502.00 7813.86
1962 1736.50 1428.50 1189.62 c 663.50 119.83 e 25.00 q 20.50 g 11.00 289.82 b 330.00 i 857.40 e 1329.68 c 7625.85
1963 1833.50 1389.50 940.00 503.50 293.00 31.00 1.00 33.58 a 77.50 f 188.50 771.00 1718.00 7702.58
1964 1398.50 1259.50 1232.00 564.50 185.50 85.00 3.00 75.00 219.50 507.50 901.50 1627.00 8058.50
1965 1757.50 1504.50 1441.00 714.50 192.00 36.50 12.50 53.00 389.50 475.50 973.00 1199.00 8748.50
1966 1954.50 1424.00 963.50 719.50 371.00 56.50 4.00 70.00 212.00 549.50 761.50 h 1482.00 7806.50
1967 1559.00 1609.00 1121.50 618.00 412.50 51.00 33.00 74.00 184.00 566.00 1046.50 1348.50 8623.00
1968 1619.50 1492.50 862.00 514.50 376.50 84.00 33.00 56.00 0.00 z 459.00 945.50 1518.50 7961.00
1969 1764.00 1294.00 1297.00 534.50 258.00 181.50 18.00 5.00 181.00 636.50 967.50 1433.75 a 8570.75
1970 1876.00 1409.00 1292.50 637.00 296.00 44.50 10.00 20.00 226.50 526.50 1028.00 1487.00 8853.00
1971 1856.50 1377.00 1219.00 594.00 358.00 26.00 34.50 57.50 184.50 383.50 970.00 1467.50 8528.00
1972 1831.00 1606.50 1240.50 731.00 200.00 88.00 33.50 62.50 244.50 663.00 969.00 1663.00 9332.50
1973 1528.50 1275.50 818.00 631.50 352.50 33.50 10.00 16.00 240.00 345.00 930.00 1516.50 7697.00
1974 1654.50 1375.50 1137.70 a 580.50 371.00 94.00 0.00 63.50 294.50 479.50 917.00 1281.50 8249.20
1975 1597.50 1368.00 1321.50 811.00 201.00 70.50 21.50 18.00 260.00 422.00 873.00 1459.00 8423.00
1976 1772.88 b 1162.50 1098.00 476.00 252.00 16.00 2.00 27.50 208.00 692.00 1156.00 1725.15 a 8588.03
1977 2031.50 1254.40 c 881.50 404.50 76.50 34.50 2.00 54.50 167.50 534.50 1016.00 1577.00 8034.40
1978 1822.80 a 1524.00 1140.50 666.50 197.50 57.50 14.50 14.50 134.50 503.00 1028.50 1684.52 c 8788.32
1979 1985.50 1571.50 1200.00 707.50 390.00 66.50 9.50 39.50 136.00 581.00 1015.50 1257.00 8959.50
1980 1611.50 1441.50 1185.48 b 525.00 199.50 56.00 4.00 15.50 217.50 633.50 903.50 1474.00 8266.98
1981 1572.39 d 1197.50 912.50 520.50 287.00 46.50 13.00 15.00 229.50 608.50 849.00 1490.00 7741.39
1982 1987.10 a 1414.00 1186.50 685.50 148.50 127.00 1.00 44.50 230.17 a 469.00 1045.00 1260.50 8598.77
1983 1429.50 1085.00 1006.50 714.00 365.50 70.00 6.00 0.00 172.00 504.50 925.50 1910.50 8189.00
1984 1658.00 1072.00 1246.50 554.00 300.50 14.00 10.00 12.00 281.00 422.50 950.50 1459.50 7980.50
1985 1679.00 1390.50 940.50 452.50 137.50 118.00 4.00 61.50 268.00 551.00 1215.00 1778.50 8596.00
1986 1506.00 1388.50 977.00 478.00 210.00 42.00 1.50 0.00 z 0.00 z 0.00 z 1076.50 1299.00 6978.50
1987 1370.50 939.00 821.50 322.00 114.00 4.00 2.00 33.00 92.50 608.50 809.00 1262.00 6378.00
1988 1705.50 1508.00 986.00 507.50 75.00 8.50 1.50 14.00 105.50 628.00 968.50 1419.50 7927.50
1989 1381.50 1543.50 1211.00 590.50 234.00 50.50 0.00 3.00 137.00 434.50 1080.50 1685.50 8351.50
1990 1198.00 1184.50 909.00 539.50 246.00 26.50 5.00 7.50 131.00 498.00 812.50 1468.00 7025.50
1991 1623.00 1118.00 951.00 451.50 187.00 5.00 7.00 6.00 196.50 533.00 1205.50 1356.00 7639.50
1992 1364.50 1064.50 976.50 642.50 153.50 63.50 21.50 50.00 152.00 517.50 1009.50 1350.50 7366.00
1993 1555.00 1316.00 1086.50 603.50 214.50 78.50 2.00 16.50 279.00 536.00 1020.00 1360.50 8068.00
1994 1871.50 1458.00 926.50 541.50 158.50 18.00 3.50 32.50 93.50 371.50 807.50 1247.00 7529.50
1995 1469.00 1281.50 967.50 682.50 236.00 36.50 9.00 0.00 193.00 475.50 1142.50 1470.00 7963.00
1996 1743.50 1369.00 1232.00 680.50 280.00 51.50 6.50 2.50 167.50 454.00 1170.00 1546.00 8703.00
1997 1672.00 1198.00 1051.00 608.00 305.00 5.00 24.00 28.00 84.50 432.00 1050.50 1146.00 7604.00
1998 1392.50 899.50 979.50 375.00 52.50 84.50 0.00 0.00 52.00 373.00 790.50 1193.00 6192.00
1999 1597.00 1034.00 923.50 444.00 124.00 63.00 0.00 1.00 138.00 436.00 666.50 1197.00 6624.00
2000 1496.00 1078.50 734.50 527.50 150.00 64.50 6.00 0.00 134.00 332.00 953.50 1777.00 7253.50
2001 1341.00 1424.00 1102.00 494.00 166.50 47.00 2.50 0.00 150.00 468.00 546.00 1136.50 6877.50
2002 1237.50 1009.00 1263.50 574.50 343.00 27.00 1.00 6.50 113.00 680.00 948.00 1193.00 7396.00
2003 1513.00 1375.00 1036.00 504.00 206.00 37.50 1.00 2.00 164.50 431.50 941.00 1215.00 7426.50
2004 1660.00 1216.50 909.50 461.50 264.00 70.50 9.00 52.50 74.00 474.50 820.50 1381.50 7394.00
2005 1598.00 1131.00 1094.00 476.00 336.50 1.00 10.00 10.00 77.50 423.50 881.00 1418.50 7457.00
2006 1165.50 1326.50 1005.50 401.00 231.00 32.00 0.00 4.50 223.50 611.50 873.00 1169.50 7043.50
2007 1438.50 1510.00 917.00 597.00 154.50 20.00 3.00 23.50 153.00 375.50 927.00 1545.50 7664.50
2008 1631.00 1482.50 1214.50 700.50 339.50 28.00 4.00 8.50 123.00 500.50 914.50 1638.50 8585.00
2009 1856.50 1278.50 1095.00 593.00 254.00 106.00 32.00 39.50 52.50 701.00 701.00 1502.00 8211.00
2010 1646.00 1325.50 808.00 379.00 244.50 47.00 0.00 1.00 217.00 393.50 935.00 1563.00 7559.50
2011 1707.50 1349.00 1178.00 620.50 295.00 60.00 0.50 1.50 197.50 365.00 813.00 1210.00 7797.50
2012 1359.50 1104.00 605.50 510.50 166.00 33.00 0.00 18.50 165.00 579.00 885.50 1333.00 6759.50
2013 1539.00 1350.00 1252.00 37.00 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 4141.00
Period of Record Statistics
MEAN 1618.85 1310.92 1063.49 570.24 239.01 53.05 8.97 24.31 180.99 497.88 944.77 1435.32 7914.07
S.D. 200.99 172.98 172.94 107.05 88.55 34.61 10.07 23.08 69.35 106.72 134.88 185.83 709.89
SKEW -0.09 -0.43 -0.10 -0.07 -0.01 1.12 1.33 0.78 0.34 -0.09 -0.11 0.32 -0.41
MAX 2031.50 1609.00 1441.00 811.00 412.50 181.50 34.50 75.00 389.50 701.00 1262.00 1910.50 9332.50
MIN 1165.50 899.50 605.50 322.00 52.50 1.00 0.00 0.00 52.00 188.50 546.00 1136.50 6192.00
NO YRS 55 55 55 54 54 53 53 53 50 52 54 55 48