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 201205
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
1919 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 175.50 j 719.50 1160.00 0.00 z 1879.50
1920 0.00 z 0.00 z 1180.77 c 942.00 e 323.20 d 130.00 c 13.50 q 57.50 f 150.00 b 170.50 n 0.00 z 0.00 z 2725.97
1921 0.00 z 0.00 z 0.00 z 0.00 z 296.50 79.04 d 4.81 b 57.87 a 163.45 a 541.00 0.00 z 1436.13 e 2578.80
1922 1713.30 c 1633.50 1177.45 c 721.50 130.50 79.82 b 64.38 e 30.00 190.86 a 0.00 z 822.12 d 1557.75 c 8121.18
1923 1622.69 b 0.00 z 1473.61 c 754.82 b 320.00 58.33 c 9.62 b 138.95 c 181.80 e 606.88 e 882.69 d 882.50 i 6049.40
1924 2023.35 e 1350.00 1234.00 752.50 568.33 a 166.03 a 67.50 107.00 340.34 a 394.50 1078.50 1884.80 a 9966.86
1925 1757.59 c 1364.50 1085.00 b 514.82 b 420.64 b 112.76 a 48.05 a 23.50 189.50 880.50 1032.78 c 1620.00 9049.63
1926 1660.64 b 1325.52 c 1366.58 a 733.50 236.50 178.97 a 37.50 49.71 b 290.89 b 607.60 a 1150.00 1636.00 9273.41
1927 1775.00 1299.85 b 978.10 b 630.54 b 403.00 b 158.50 62.50 144.00 213.00 559.00 1112.00 1867.48 b 9202.97
1928 1590.50 1417.50 1200.22 a 832.76 a 260.00 176.50 24.50 52.00 307.50 552.00 931.03 a 1413.00 8757.51
1929 2105.00 1720.00 1104.50 615.50 445.00 133.50 32.50 52.50 356.00 589.00 1168.97 a 1558.50 9880.97
1930 1929.75 a 1189.50 1124.50 576.43 b 286.23 a 47.78 c 26.00 13.43 a 246.92 d 609.00 942.50 1422.50 8414.55
1931 1351.50 1067.00 1103.00 623.89 c 388.57 b 59.48 a 14.97 b 69.50 145.00 424.50 819.23 d 1149.00 7215.64
1932 1456.47 b 1438.50 1449.25 a 699.00 321.50 17.50 19.50 20.00 258.00 668.50 1136.00 1605.80 a 9090.02
1933 1431.00 1647.00 1213.00 741.50 274.00 26.50 2.00 37.20 a 106.00 687.00 1138.39 b 1690.00 8993.59
1934 1461.50 1491.50 1312.00 742.50 180.00 62.00 15.00 133.50 334.00 538.50 924.00 1815.05 a 9009.55
1935 1881.50 1231.50 1215.50 824.00 474.30 a 0.00 z 0.00 b 86.50 287.00 638.00 968.50 f 1552.58 a 8190.88
1936 1950.00 1987.50 1219.50 892.00 246.50 123.00 5.50 f 61.50 180.50 742.50 1184.48 a 1505.50 10092.98
1937 1996.00 1489.50 1329.50 766.50 324.50 123.50 54.77 a 15.00 300.00 744.00 a 1079.48 a 1641.00 9863.75
1938 1769.50 1333.77 b 986.00 701.50 452.50 123.00 26.50 56.00 259.14 a 450.50 1058.00 1530.00 8746.41
1939 1567.00 1697.00 1271.50 808.50 230.50 93.00 19.12 a 42.50 242.00 607.00 953.79 a 1221.00 8752.91
1940 1469.00 f 1417.38 a 1385.50 809.46 b 420.00 141.50 44.50 87.00 159.50 465.00 a 1181.25 b 1422.00 7533.09
1941 1612.50 1444.50 1285.98 a 495.00 a 205.50 117.00 32.00 65.62 a 181.03 a 515.63 a 0.00 z 0.00 z 5954.77
1942 0.00 z 164.00 x 990.21 e 475.80 e 333.50 g 70.34 a 65.00 62.50 324.00 592.50 1076.50 1671.93 a 5328.79
1943 1850.91 b 1412.32 c 1461.28 b 756.50 383.88 a 107.50 16.50 39.50 335.50 562.00 1122.93 a 1407.29 b 9456.12
1944 1290.63 a 1428.81 c 1221.29 b 753.50 250.14 b 111.96 b 36.68 a 56.50 229.00 597.50 877.76 a 1561.76 b 8415.54
1945 1749.50 1448.00 942.50 760.18 b 556.34 c 213.00 58.79 b 45.50 308.00 689.48 b 1103.28 a 1678.00 9552.57
1946 1612.52 a 1528.69 b 795.84 b 574.00 415.00 128.00 24.28 a 50.50 g 263.79 a 529.07 a 1056.00 1527.86 c 8455.05
1947 1188.50 f 1457.00 1209.50 789.81 d 449.50 a 142.00 30.50 16.02 a 246.21 a 272.00 1157.68 b 1503.50 a 7273.71
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 85.18 b 30.00 38.50 169.66 a 532.00 924.64 b 1548.50 3328.48
1949 1641.28 d 1495.00 1228.50 618.62 a 256.50 50.89 b 6.72 a 30.50 267.32 b 458.80 a 919.00 1497.30 a 8470.43
1950 1933.00 1443.08 b 1400.00 913.00 430.26 b 116.50 0.00 z 152.50 222.93 a 485.50 973.50 f 1455.00 f 7096.77
1951 1804.00 973.00 g 1380.00 735.00 244.00 187.50 52.50 112.00 344.50 605.00 1276.03 a 1588.50 8329.03
1952 1750.00 1310.70 a 1310.50 582.22 c 381.00 73.00 31.50 88.87 a 268.93 b 800.50 997.24 a 1352.12 a 8946.57
1953 1659.61 c 1496.00 1158.37 a 807.50 383.00 78.00 59.50 35.00 273.00 427.00 938.28 a 1488.50 8803.75
1954 1882.00 1124.00 1278.50 708.00 543.00 90.00 a 28.50 101.00 283.00 683.50 951.21 a 1421.50 9094.21
1955 1766.50 1567.00 1378.00 491.00 240.50 116.50 2.50 30.50 268.00 572.50 1250.50 1774.50 9458.00
1956 1669.00 1600.00 1341.00 810.00 402.00 79.50 89.00 80.50 317.59 a 423.50 1047.00 1484.50 9343.59
1957 1925.00 1442.00 1277.00 707.00 401.00 142.76 a 12.00 66.50 334.00 373.00 p 1025.00 1396.50 8728.76
1958 1496.50 1528.50 1136.00 656.00 375.50 260.50 78.50 115.00 222.93 a 554.90 a 964.00 1690.50 9078.83
1959 1837.50 1456.50 1079.00 656.50 272.00 83.00 33.00 13.00 229.00 695.00 1293.50 1214.00 8862.00
1960 1604.00 1439.50 1424.50 648.00 323.50 134.00 35.00 26.00 247.00 551.50 940.00 1558.00 8931.00
1961 1693.50 1190.00 968.50 790.50 396.00 84.50 27.00 18.00 272.50 524.50 1018.00 1539.00 8522.00
1962 1802.00 1468.00 1114.50 739.00 230.00 118.50 43.00 43.00 289.50 502.00 912.00 1474.00 8735.50
1963 1938.53 a 1535.50 1033.50 579.00 354.00 91.00 13.00 72.50 175.50 293.50 860.50 1736.00 8682.53
1964 1431.50 1352.00 1260.00 611.50 218.50 122.00 11.00 121.00 275.50 572.50 981.50 1703.50 8660.50
1965 1812.50 1563.00 1445.50 713.00 247.00 119.50 54.25 a 83.50 431.50 541.00 1042.00 1299.00 9351.75
1966 2007.50 1453.00 1026.50 769.00 454.67 a 94.50 13.00 100.50 275.00 618.00 1115.50 1535.00 9462.17
1967 1609.00 1608.00 1162.50 686.00 495.00 107.50 61.50 126.00 252.50 650.00 1104.50 1474.00 9336.50
1968 1692.50 1571.00 915.00 594.50 415.50 123.75 b 56.50 86.50 237.00 511.00 1026.21 a 1579.00 8808.46
1969 1760.00 1355.50 1310.50 611.50 313.00 270.00 a 48.50 15.00 230.50 690.50 1058.79 a 1420.00 9083.79
1970 1874.00 1460.50 1320.00 709.00 368.50 76.61 b 27.00 44.50 286.00 576.50 1076.00 1549.50 9368.11
1971 1898.50 1427.00 1263.50 657.41 a 408.50 56.50 83.70 a 110.00 252.00 443.00 1032.50 1518.50 9151.11
1972 1929.50 1665.50 1305.50 806.50 250.50 121.03 a 63.00 92.00 323.00 723.50 1037.50 1706.50 10024.04
1973 1606.50 1345.50 869.50 672.93 a 412.50 66.50 32.00 33.50 308.50 430.50 994.50 1559.50 8331.93
1974 1730.00 1405.50 1179.00 635.00 422.00 154.50 8.50 102.00 396.00 581.00 964.50 1342.50 8920.50
1975 1640.50 1371.50 1361.00 856.00 254.20 a 134.00 40.00 52.00 350.50 515.00 978.62 a 1576.50 9129.82
1976 1791.00 1208.00 1194.00 571.55 a 348.00 38.00 17.50 74.50 289.00 781.00 1261.50 1830.50 9404.55
1977 2043.50 1323.00 930.00 500.00 122.50 88.50 13.50 140.00 233.00 607.50 1048.00 1592.50 8642.00
1978 1856.00 1552.50 1156.00 683.50 260.50 129.31 a 43.00 53.50 191.00 577.50 1117.00 1700.00 9319.81
1979 2030.50 1595.50 1188.50 771.50 462.00 121.50 23.00 82.50 204.64 b 669.50 1054.00 1338.50 9541.64
1980 1678.00 0.00 z 1295.50 584.50 224.00 111.00 14.00 37.00 288.50 711.00 980.00 1534.00 7457.50
1981 1557.50 1237.50 993.00 595.00 369.50 88.50 35.50 32.00 276.72 a 652.00 860.00 1504.50 8201.72
1982 2024.50 1457.00 1229.50 733.50 207.50 193.50 9.00 93.50 271.50 531.50 1113.50 1328.50 9193.00
1983 1509.00 1127.00 1052.00 767.00 437.50 123.50 12.00 3.00 223.00 577.50 984.50 1927.00 8743.00
1984 1681.00 1107.50 1277.50 595.50 360.00 47.50 29.50 25.50 331.50 479.00 1009.50 1486.00 8430.00
1985 1711.50 1434.50 957.50 535.00 215.00 178.50 29.00 106.00 292.50 601.00 1251.50 1845.50 9157.50
1986 1541.50 1422.00 1023.50 498.00 246.50 89.50 12.50 96.50 252.50 583.00 1164.50 1414.50 8344.50
1987 1505.50 1088.50 946.50 506.00 289.00 70.50 20.50 83.50 229.50 787.00 909.00 1339.50 7775.00
1988 1836.50 1648.50 1129.50 661.50 193.50 70.00 21.00 58.00 232.50 745.50 1011.50 1548.50 9156.50
1989 1535.00 1704.00 1337.50 740.00 335.50 132.00 8.50 47.00 253.50 569.00 1171.00 1832.50 9665.50
1990 1358.50 1369.50 1049.50 652.50 414.00 72.50 44.00 50.00 215.00 663.50 914.00 1555.50 8358.50
1991 1762.50 1261.00 1069.50 565.00 252.00 44.50 40.00 40.00 299.00 660.00 1251.00 1471.98 a 8716.48
1992 1481.00 1195.00 1093.00 754.50 269.50 151.50 117.00 136.00 265.50 633.00 1056.50 1391.79 b 8544.29
1993 1673.00 1381.50 1148.50 740.00 350.50 172.00 27.50 56.50 408.00 689.00 1128.50 1444.50 9219.50
1994 2028.50 1568.50 1049.00 687.00 291.50 73.50 37.00 93.50 167.50 486.00 895.00 1361.50 8738.50
1995 1588.00 1458.50 1068.50 832.00 354.50 69.50 32.50 18.50 295.50 601.00 1256.00 1603.50 9178.00
1996 1912.00 1519.00 1368.00 807.00 402.50 106.50 48.00 25.50 238.50 569.00 1244.00 1617.50 9857.50
1997 1768.50 1319.50 1156.50 709.00 469.00 41.50 63.00 95.50 174.00 550.00 1102.50 1224.50 8673.50
1998 1486.00 945.00 1064.00 533.00 171.50 150.50 11.50 12.50 127.00 469.50 876.50 1367.00 7214.00
1999 1737.50 1138.50 1012.00 595.00 225.50 126.50 12.00 25.00 90.00 p 620.00 779.50 1347.50 7619.00
2000 1643.50 1208.50 888.00 694.50 277.00 143.50 34.50 27.90 a 273.50 480.00 997.50 1858.50 8526.90
2001 1480.00 1576.50 1195.00 630.00 258.50 120.00 34.00 23.50 261.50 601.50 683.50 1236.50 8100.50
2002 1384.00 1196.00 1376.50 717.00 476.00 80.00 10.00 34.00 160.50 n 790.50 1053.50 1313.00 8430.50
2003 1664.50 540.00 r 246.00 v 489.50 g 355.50 125.50 32.00 20.00 246.00 588.50 1068.00 1349.00 5449.00
2004 1818.00 1373.00 1056.50 664.00 402.50 179.00 59.00 181.00 125.00 531.00 901.00 1482.50 8772.50
2005 1726.00 1203.00 1197.00 542.50 407.00 23.50 33.00 54.00 145.00 546.50 960.00 1455.00 8292.50
2006 1231.50 1415.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 22.50 289.00 0.00 z 942.00 1237.50 5137.50
2007 1510.00 1578.00 981.00 687.50 218.50 46.50 22.50 50.50 207.50 472.50 1001.50 1613.00 8389.00
2008 1709.50 1565.00 1264.50 756.00 433.50 107.50 24.50 52.00 220.50 596.00 993.50 1734.50 9457.00
2009 1995.00 1346.50 1148.00 660.50 341.50 153.00 79.50 91.50 105.00 756.00 793.00 1585.50 9055.00
2010 1726.50 1348.00 850.00 464.50 312.00 103.00 0.00 z 23.00 278.50 491.00 868.20 e 1517.34 c 7982.04
2011 1642.00 1254.96 c 791.50 j 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 2896.96
2012 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
Period of Record Statistics
MEAN 1711.39 1412.14 1172.28 683.74 335.32 110.00 34.05 63.13 252.84 584.22 1029.64 1527.53 8926.68
S.D. 191.60 173.86 158.21 106.41 97.86 47.97 22.46 39.13 65.65 109.41 125.47 168.79 556.57
SKEW -0.14 0.03 -0.16 -0.06 0.11 0.70 0.99 0.72 0.01 -0.02 -0.02 0.21 -0.61
MAX 2105.00 1987.50 1473.61 942.00 568.33 270.00 117.00 181.00 431.50 880.50 1293.50 1927.00 10024.04
MIN 1231.50 945.00 795.84 464.50 122.50 17.50 0.00 3.00 105.00 272.00 683.50 1149.00 7214.00
NO YRS 86 84 87 87 88 89 86 89 89 88 87 87 70