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
1893 1623.50 1404.50 0.00 z 0.00 z 329.93 c 6.00 k 2.50 o 60.50 f 0.00 z 0.00 z 0.00 z 0.00 z 3357.93
1894 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
1895 0.00 z 0.00 z 244.00 s 289.82 b 198.18 c 39.64 b 3.88 c 7.23 a 130.00 608.38 c 1076.38 a 1314.92 a 3668.42
1896 1372.50 1151.50 1205.38 a 446.00 144.31 b 9.00 l 0.00 z 29.45 a 283.27 d 618.00 1095.00 f 1218.00 6468.41
1897 1660.50 1256.50 1280.30 a 0.00 z 216.50 j 124.50 1.00 p 0.00 z 77.50 379.75 a 1043.28 a 1542.52 b 7364.84
1898 1342.50 1261.04 a 962.50 604.00 264.50 25.34 a 9.41 c 18.17 b 165.52 a 660.41 c 1077.41 a 1713.78 a 8104.59
1899 1336.00 f 1747.00 1610.97 a 0.00 z 270.98 b 0.00 z 0.00 z 9.82 a 233.79 a 449.50 c 901.00 0.00 z 5223.06
1900 718.00 o 1518.00 1191.50 448.00 175.50 53.00 7.50 0.00 165.50 308.97 a 1115.50 1315.50 6298.97
1901 1450.80 a 1384.50 1073.00 555.00 259.50 64.00 0.00 10.00 244.62 d 471.50 1019.50 1564.47 a 8096.88
1902 1416.00 1436.17 d 927.00 613.00 152.00 0.00 z 5.00 0.00 z 298.97 a 0.00 z 748.50 g 1551.50 6399.63
1903 1439.43 a 1424.00 958.50 551.00 304.00 111.00 10.00 59.00 257.50 496.50 1050.50 1568.50 8229.93
1904 1782.50 1680.00 1088.50 723.50 253.50 70.00 27.50 45.50 164.50 489.00 774.50 1432.50 8531.50
1905 1799.03 a 1569.50 866.00 639.00 323.50 43.50 18.50 0.00 93.62 a 0.00 z 896.79 b 1248.50 7497.94
1906 1325.00 1244.17 e 1301.00 473.89 c 257.00 75.50 24.50 17.50 109.50 564.00 988.50 1367.50 7748.06
1907 1684.00 1266.00 964.50 838.00 518.00 91.50 16.00 63.50 227.00 551.00 925.50 1241.00 8386.00
1908 1395.50 1306.00 992.50 538.50 279.00 80.00 27.00 46.50 113.00 558.00 848.50 1305.50 7490.00
1909 1527.00 1288.50 1129.50 784.50 314.00 50.00 27.50 10.50 175.50 581.50 865.00 1617.00 8370.50
1910 1585.50 1481.50 628.50 439.50 371.50 118.93 b 0.50 41.50 204.00 395.00 1107.50 1406.50 7780.43
1911 1667.00 1237.00 905.50 652.50 176.50 7.50 17.50 51.15 a 180.50 637.50 1216.00 1252.92 a 8001.57
1912 2023.00 1449.00 1346.50 557.00 246.00 136.00 36.50 37.50 271.50 486.50 842.50 1254.00 8686.00
1913 1582.50 1423.50 1145.00 558.00 345.50 69.50 2.50 g 1.50 245.00 c 603.50 694.00 1097.00 7765.00
1914 1367.50 1569.00 1071.50 0.00 z 247.00 36.50 3.50 51.00 160.50 349.00 887.00 1711.50 7454.00
1915 0.00 z 1158.50 1219.50 337.00 413.50 157.50 61.00 101.50 194.50 426.00 904.00 1406.00 6379.00
1916 1734.97 a 1549.00 1152.00 681.50 306.00 129.50 0.00 35.00 240.00 607.50 934.50 1620.50 8990.47
1917 1792.50 1650.50 1172.50 720.50 407.00 108.00 26.00 45.00 211.00 805.00 860.00 1758.00 9556.00
1918 1945.50 1432.67 d 841.50 702.50 218.50 49.50 14.00 8.00 255.00 380.00 836.00 1099.00 7782.17
1919 1181.50 270.50 v 671.00 f 616.00 292.50 49.50 0.00 11.50 105.50 592.50 1087.50 1650.50 5587.00
1920 1668.00 1313.00 983.50 839.50 244.50 130.96 d 5.00 33.50 93.00 303.00 955.00 0.00 z 6568.96
1921 1285.47 a 1044.00 882.00 483.50 242.00 17.50 1.50 31.00 120.00 408.50 1031.00 1227.00 6773.47
1922 1574.00 1338.50 970.00 569.00 162.00 23.50 19.00 7.50 128.00 427.50 778.00 1503.50 7500.50
1923 1358.00 0.00 z 1286.50 607.00 292.50 59.50 3.00 34.00 134.00 574.00 961.00 855.00 f 5309.50
1924 1791.00 1184.50 1138.00 557.00 469.65 a 109.50 21.50 32.50 266.00 355.00 919.00 1775.00 8618.65
1925 1573.00 1209.00 950.00 375.50 378.72 a 42.00 19.50 4.50 104.50 891.50 959.50 1440.00 7947.72
1926 1477.50 1105.50 1145.50 545.50 f 135.00 61.50 4.50 0.50 197.50 531.50 1071.00 1489.00 7219.00
1927 1506.00 1116.00 893.50 538.50 302.00 119.50 3.50 49.00 211.50 341.50 989.50 1653.50 7724.00
1928 1360.00 1173.00 914.50 729.00 126.00 74.00 1.00 32.50 165.00 424.50 853.50 1176.50 7029.50
1929 1886.35 a 1559.70 a 951.50 486.00 320.00 64.50 0.00 6.50 212.00 457.50 1080.50 1360.50 8385.05
1930 1800.00 936.00 975.00 464.50 238.50 45.00 6.50 2.00 127.00 519.00 788.50 1192.50 7094.50
1931 1167.00 884.50 935.00 434.50 299.00 35.00 1.50 14.00 75.50 327.50 782.50 1049.00 6005.00
1932 1501.95 a 1209.71 a 1256.50 509.00 149.00 0.00 5.00 12.50 136.50 528.50 1030.00 1431.50 7770.16
1933 1197.12 a 1354.00 1011.50 518.00 239.50 9.00 2.50 15.50 70.00 538.50 950.00 1383.00 7288.62
1934 1326.50 1188.00 1033.00 522.00 73.76 b 3.50 1.50 58.00 247.50 331.00 811.00 1462.50 7058.26
1935 1595.50 1068.50 872.00 644.50 352.00 96.50 0.00 44.50 137.00 611.00 1098.50 1459.50 7979.50
1936 1920.50 1912.50 1031.50 707.00 113.50 51.00 0.00 1.00 104.50 605.50 1011.50 1282.50 8741.00
1937 1902.50 1429.50 1120.50 614.00 175.50 82.50 3.00 0.00 154.00 546.00 1023.50 1470.50 8521.50
1938 1561.00 1224.74 a 806.00 492.00 279.00 25.50 0.00 6.00 91.00 263.50 997.50 1333.50 7079.74
1939 1305.50 1499.00 1017.00 599.00 105.50 23.00 0.00 14.00 125.17 a 493.00 804.50 1052.50 7038.17
1940 1760.50 1255.00 1159.50 612.00 257.00 20.00 7.50 40.00 124.00 284.00 1072.50 1246.00 7838.00
1941 1413.50 1300.50 1062.00 423.00 124.50 62.00 15.00 15.50 136.00 403.00 829.00 1120.50 6904.50
1942 1347.50 1237.00 903.50 384.00 294.50 58.00 11.00 17.50 266.00 471.50 896.50 1508.50 7395.50
1943 1730.50 1191.50 1174.50 559.00 348.50 79.00 0.00 21.00 250.50 481.50 1019.50 1243.00 8098.50
1944 1108.50 1219.50 1184.50 683.00 161.00 53.00 2.50 41.00 138.00 395.00 813.00 1375.00 7174.00
1945 1433.50 1177.50 756.50 595.50 392.00 154.00 15.00 15.00 206.50 436.00 953.50 1564.00 7699.00
1946 1491.50 1168.50 656.50 387.00 323.50 85.00 4.00 37.00 178.50 406.50 933.50 1259.00 6930.50
1947 1305.00 1400.50 1104.00 662.00 334.50 106.50 8.50 0.00 170.00 229.00 1089.00 1406.50 7815.50
1948 0.00 z 0.00 z 0.00 z 415.50 258.50 30.00 0.50 18.50 82.50 454.00 895.00 1364.00 3518.50
1949 1593.00 1393.00 1054.00 522.50 144.00 11.50 1.00 11.00 185.50 374.00 736.50 1323.00 7349.00
1950 1759.50 1258.50 1169.73 a 793.50 293.50 42.50 10.50 36.50 121.00 300.50 1027.50 1185.00 g 6813.23
1951 1609.00 1204.50 1373.50 695.50 128.50 100.50 20.50 23.00 244.00 476.00 1126.50 1535.61 c 8537.11
1952 1552.07 a 1090.50 1171.50 499.50 239.00 8.00 4.81 b 17.50 130.34 a 582.00 866.50 1295.50 7457.22
1953 1471.00 1156.40 c 1022.43 d 716.00 226.50 29.00 9.50 1.00 105.00 281.00 785.00 1275.50 7078.33
1954 1590.30 a 838.50 1127.50 503.79 a 363.50 50.00 0.00 3.50 108.00 528.00 749.00 1243.00 7105.09
1955 1449.50 1394.50 1089.50 293.50 117.00 50.50 0.00 4.65 a 119.00 411.00 1112.00 1583.50 7624.65
1956 1584.50 1388.38 a 1131.50 a 652.00 219.00 14.00 6.00 25.00 136.00 244.00 936.50 1205.00 7541.88
1957 1633.70 a 1121.04 a 1030.50 537.50 270.45 b 30.00 0.00 19.00 172.00 531.65 a 955.86 a 1142.00 7443.70
1958 1292.50 1393.78 a 1031.00 548.00 142.50 92.00 13.00 22.00 85.50 349.50 857.50 1474.50 7301.78
1959 1636.80 a 1403.00 1027.00 509.50 198.00 23.00 5.50 6.50 168.50 620.00 1172.50 1072.00 7842.30
1960 1470.50 1340.50 1448.45 b 529.00 229.50 42.50 5.17 a 2.50 164.00 447.00 824.50 1374.50 7878.11
1961 1521.00 1174.00 980.78 b 720.00 308.00 24.00 1.00 6.72 a 204.50 0.00 z 571.00 1490.50 7001.49
1962 1642.00 1303.56 a 1253.50 663.33 c 136.00 50.50 19.50 4.50 212.50 406.00 785.50 1307.17 a 7784.06
1963 1779.50 1333.50 857.50 458.00 242.00 14.00 0.00 24.00 85.00 190.50 765.00 1615.00 7364.00
1964 1294.50 1118.00 1161.00 542.00 122.00 35.50 1.00 52.18 a 194.00 463.00 861.50 1530.00 7374.68
1965 1602.50 1369.00 1410.50 624.50 132.00 7.00 1.50 39.50 335.50 386.50 898.97 a 1077.50 7884.97
1966 1784.00 974.50 g 833.50 707.59 a 320.00 39.00 0.00 52.00 190.86 a 507.50 1046.50 1437.00 6917.95
1967 1509.00 1450.30 a 969.00 572.50 403.00 32.50 38.00 47.50 197.00 577.12 a 986.00 1362.50 8144.41
1968 1597.00 1429.50 842.68 a 531.00 374.00 80.00 13.50 35.50 180.50 475.00 930.00 1467.50 7956.18
1969 1791.00 1323.50 1399.50 571.03 a 228.50 136.50 8.00 2.50 158.50 637.50 944.00 1379.50 8580.04
1970 1898.50 1353.50 1218.50 601.00 233.00 41.50 20.00 9.00 189.00 559.50 988.00 1526.50 8638.00
1971 1776.00 1384.00 1184.50 528.00 311.00 23.00 36.50 39.00 197.00 398.00 917.50 1436.00 8230.50
1972 1719.50 1528.50 1101.00 691.00 217.50 66.50 31.50 62.00 223.50 646.00 967.50 1639.50 8894.00
1973 1468.00 1228.00 822.00 597.50 323.00 27.00 5.50 5.00 196.50 353.00 903.00 1500.50 7429.00
1974 1623.50 1245.00 1035.00 572.00 327.50 70.50 1.50 48.50 278.50 509.00 0.00 z 1324.50 7035.50
1975 1535.50 1394.50 1323.18 a 747.00 169.00 62.00 17.50 1.50 258.00 445.00 831.50 1318.50 8103.18
1976 1500.50 1000.00 0.00 z 439.62 d 233.50 32.00 7.00 28.50 211.00 684.00 1157.00 1628.50 6921.62
1977 1973.00 1143.00 860.50 404.00 65.50 20.00 8.50 59.50 132.00 570.00 1019.00 1554.00 7809.00
1978 1924.50 1562.00 1101.50 592.00 227.00 48.50 14.00 20.50 96.50 516.00 997.50 1571.00 8671.00
1979 2013.50 1676.00 1223.00 746.00 352.00 78.00 3.50 0.00 z 148.50 550.50 1010.50 1225.00 9026.50
1980 1542.50 1500.00 1216.00 592.50 241.80 a 58.50 5.00 29.00 194.50 653.00 881.50 1424.00 8338.30
1981 1414.00 1115.33 a 873.50 454.50 270.00 27.00 18.00 28.50 160.50 609.50 802.00 1493.00 7265.83
1982 1949.50 1387.50 1074.00 692.00 188.50 107.00 1.00 48.00 197.50 498.00 1056.50 1261.50 8461.00
1983 1426.00 1139.00 1076.00 759.00 353.00 65.50 0.00 2.00 185.00 506.50 948.00 1993.30 a 8453.30
1984 1550.50 1130.00 1318.50 638.00 310.00 10.50 6.00 18.00 251.00 434.50 930.00 1400.00 7997.00
1985 1684.50 1355.50 868.50 462.00 128.50 104.50 9.50 53.00 258.50 547.50 1269.00 1762.50 8503.50
1986 1417.50 1397.00 927.00 493.50 209.50 21.00 4.50 67.50 157.00 487.50 1096.50 1269.00 7547.50
1987 1343.50 913.50 868.50 417.00 103.00 0.00 z 3.50 64.50 156.50 665.00 802.50 1263.00 6600.50
1988 1735.00 1537.50 933.50 606.00 72.50 8.50 5.00 20.00 103.00 604.50 901.00 1347.00 7873.50
1989 1228.00 1541.50 1175.00 612.50 255.50 72.00 2.00 12.00 210.50 479.00 1111.00 1684.00 8383.00
1990 1188.00 1179.50 947.00 619.50 333.50 54.50 19.50 28.50 143.50 563.50 857.50 1536.00 7470.50
1991 1701.50 1097.00 1012.00 521.50 234.50 15.50 13.00 18.50 230.00 599.00 1241.50 1309.50 7993.50
1992 1292.00 1091.00 960.00 719.00 220.00 67.50 72.00 99.50 225.50 546.50 1046.00 1444.08 a 7783.08
1993 1655.50 1414.50 1234.00 696.00 295.00 102.00 4.00 24.00 305.00 581.50 1047.50 1397.50 8756.50
1994 1848.50 1529.00 950.00 593.00 209.00 11.00 11.00 54.50 137.50 421.50 866.50 1337.50 7969.00
1995 1521.00 1226.00 1023.00 732.41 a 318.50 59.50 16.50 8.50 238.00 534.00 1166.50 1358.50 8202.41
1996 1711.50 1333.50 1233.50 0.00 z 370.50 58.00 10.00 11.50 218.50 504.50 1215.00 1636.50 8303.00
1997 1732.38 a 1260.50 1061.00 705.50 419.02 a 4.00 24.50 35.00 143.00 495.50 1119.00 1205.00 8204.40
1998 1449.50 982.50 1141.00 523.50 103.50 100.50 2.00 0.00 z 78.00 442.50 812.50 1180.00 6815.50
1999 1665.73 a 1033.00 974.50 564.50 225.50 68.00 0.50 9.00 191.00 535.00 689.50 1252.00 7208.23
2000 1521.00 1048.00 759.00 574.50 179.00 77.50 25.50 13.00 177.00 428.50 1082.50 1827.45 a 7712.95
2001 1420.50 1485.00 0.00 z 531.00 205.00 54.50 3.50 23.50 198.50 540.00 577.00 1150.00 6188.50
2002 1273.50 1129.50 1278.50 592.50 345.50 27.50 5.50 22.00 151.50 719.00 992.50 1198.00 7735.50
2003 1526.00 1377.00 1064.50 561.00 294.50 58.00 6.00 9.00 202.50 460.50 986.00 1281.00 7826.00
2004 1582.50 1334.00 860.50 519.50 280.50 71.00 25.00 99.00 99.00 480.50 824.00 1297.00 7472.50
2005 1579.00 1047.00 1081.50 450.00 302.50 9.00 10.50 26.50 65.50 341.00 778.50 1234.50 f 5691.00
2006 1165.00 1297.00 1055.50 431.50 249.00 26.90 a 2.00 7.00 237.00 596.50 876.50 1114.00 7057.90
2007 1418.50 1500.50 874.00 649.00 136.50 31.50 2.50 8.50 158.00 339.50 908.00 1519.00 a 7545.50
2008 1662.00 1538.55 a 1161.00 686.50 313.00 16.00 1.00 24.50 153.00 537.00 938.50 1603.50 8634.55
2009 1747.50 1237.00 1029.50 647.00 264.50 92.00 36.50 52.00 109.00 719.50 737.00 1635.52 b 8307.02
2010 1812.00 1482.00 967.50 405.00 311.19 e 17.00 0.00 5.00 185.00 418.00 964.00 1598.50 8165.19
2011 1696.14 c 1338.30 a 1155.00 646.50 306.00 47.00 0.00 7.23 a 222.22 c 441.00 917.50 1242.50 8019.40
2012 1306.77 e 1150.87 b 538.92 e 470.77 d 89.00 g 28.33 c 0.00 u 24.00 f 208.80 e 603.50 880.71 b 1383.67 e 6572.35
2013 1540.04 c 1282.40 c 1267.26 b 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 4089.69
Period of Record Statistics
MEAN 1564.77 1304.32 1056.32 573.93 253.03 55.83 10.16 26.05 174.90 490.52 942.61 1401.81 7857.96
S.D. 206.44 187.87 175.75 113.95 89.81 36.58 12.31 22.08 58.82 120.25 133.39 186.01 589.92
SKEW 0.06 0.18 0.07 -0.05 0.07 0.69 2.21 1.15 0.21 0.14 -0.05 0.37 -0.06
MAX 2023.00 1912.50 1610.97 839.50 518.00 157.50 72.00 101.50 335.50 891.50 1269.00 1993.30 9556.00
MIN 1108.50 838.50 538.92 289.82 65.50 0.00 0.00 0.00 65.50 190.50 571.00 1049.00 6005.00
NO YRS 115 115 114 113 117 114 113 113 118 115 115 113 91