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
1895 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
1896 777.50 m 1292.00 429.50 u 100.00 s 105.00 18.00 15.00 33.50 271.50 660.50 1109.00 1295.00 4799.50
1897 1464.50 1225.50 1217.00 616.50 304.50 135.00 3.50 66.13 a 102.00 406.50 1037.50 1502.50 8081.13
1898 1379.00 1252.00 969.50 632.00 239.50 34.00 12.50 0.00 z 53.50 h 499.50 i 981.50 1527.50 7027.50
1899 1648.00 1602.50 1416.00 548.00 254.50 36.00 2.00 14.00 275.50 431.50 741.00 1370.00 8339.00
1900 1313.00 1478.00 1258.50 534.50 0.00 z 0.00 z 0.00 z 0.00 n 160.86 a 294.00 1044.00 1285.50 7368.36
1901 1474.05 a 1507.00 1189.50 552.78 c 256.27 a 79.50 4.65 a 15.50 206.25 b 456.00 1000.50 1489.55 a 8231.54
1902 1491.50 1356.00 904.00 607.50 253.50 110.50 11.00 55.00 128.50 o 513.00 782.50 1434.00 7518.50
1903 1571.00 1354.00 873.50 588.00 254.00 110.00 21.00 75.71 e 229.66 a 229.50 q 849.00 j 1691.16 c 6768.03
1904 1783.50 1726.54 a 1190.40 a 788.79 a 281.07 a 72.41 a 28.00 0.00 z 0.00 z 0.00 z 862.76 a 1468.00 8201.47
1905 1764.42 a 1533.00 1042.00 637.00 362.00 84.81 d 13.00 6.50 153.50 566.00 946.50 1296.50 8405.22
1906 1354.50 1388.50 1344.00 522.50 297.00 62.00 14.00 14.00 96.00 541.00 892.50 1286.50 7812.50
1907 1571.00 1273.00 920.50 835.50 386.00 f 86.50 11.50 44.00 217.00 539.00 941.00 1263.50 7702.50
1908 1400.00 1328.50 1015.50 557.50 251.00 92.07 a 19.00 55.50 107.50 437.50 g 730.00 f 1388.36 c 6214.93
1909 1468.00 1230.00 1166.00 798.50 356.00 68.50 14.50 13.50 200.50 638.50 759.50 1545.50 8259.00
1910 1584.50 1429.04 a 704.45 b 511.00 406.00 93.50 0.00 15.00 208.50 392.50 1093.50 1480.00 7917.99
1911 1534.00 1156.00 981.00 660.00 196.50 15.50 31.00 50.12 a 203.00 589.00 b 1145.50 1215.50 7777.12
1912 2115.50 1512.50 1347.50 589.82 b 300.91 b 95.17 a 33.00 76.50 202.50 485.15 a 887.50 793.00 k 7646.06
1913 1507.00 1471.50 1217.55 b 552.86 b 192.50 l 82.50 20.31 b 15.50 224.00 378.00 h 800.77 d 1086.00 6977.99
1914 1283.29 b 1574.50 1123.00 700.34 a 223.50 104.50 7.00 41.00 166.50 327.00 882.50 1537.60 a 7970.74
1915 1597.00 1093.50 1116.50 353.50 420.10 b 153.00 47.50 112.50 149.00 467.50 870.00 1321.00 7701.10
1916 1493.00 1481.00 1238.00 604.50 286.50 121.00 0.00 30.00 225.50 529.58 a 965.00 1547.00 8521.08
1917 1688.00 1618.50 1131.50 678.50 414.50 121.00 1.50 55.50 216.50 814.50 853.50 1557.50 9151.00
1918 1860.00 1381.50 907.50 707.50 197.50 45.00 20.50 16.00 318.50 451.00 805.50 1130.00 7840.50
1919 1292.50 1204.00 1012.50 595.50 346.00 18.00 0.00 25.00 109.50 540.50 1024.50 1668.00 7836.00
1920 1756.50 1411.50 1068.00 769.00 305.50 42.50 24.00 34.50 115.00 290.00 950.50 1258.00 8025.00
1921 1309.00 1139.00 913.00 435.50 237.00 43.00 0.00 15.00 61.00 477.00 1077.00 1358.00 7064.50
1922 1622.33 a 1396.50 1075.00 613.00 89.00 24.50 7.50 23.50 159.50 472.50 748.00 1416.00 7647.33
1923 1449.50 1526.50 1315.43 a 722.22 c 347.09 c 39.50 3.50 55.00 g 205.00 578.50 835.86 a 1066.50 8089.61
1924 1847.50 1308.00 1147.50 698.00 509.00 190.80 e 46.00 51.50 264.50 354.00 899.00 1580.50 8896.30
1925 1523.65 a 1204.50 988.00 463.50 421.82 c 45.50 9.50 22.00 135.50 835.00 971.67 c 1448.70 c 8069.33
1926 1550.57 d 1210.00 1375.92 e 790.20 e 241.05 b 186.11 c 29.45 a 13.00 250.18 b 631.50 1132.76 a 1486.45 a 8897.20
1927 1613.55 a 1182.00 976.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 1529.50 5301.05
1928 1419.00 1214.98 e 538.00 m 776.50 226.82 a 136.50 12.00 33.50 236.50 432.45 a 826.50 1218.50 6533.25
1929 1865.50 1533.00 970.50 551.50 410.50 105.00 20.00 38.75 a 187.00 475.69 b 988.00 1348.50 8493.94
1930 1673.48 a 1125.50 1029.00 532.00 244.38 a 31.50 14.50 11.00 130.00 527.00 785.69 a 1307.50 7411.56
1931 1251.50 962.50 1017.00 522.50 304.00 12.50 j 5.68 a 36.50 75.00 351.00 671.50 1040.50 6237.68
1932 1259.50 1261.50 a 1260.00 659.50 264.50 3.50 19.78 b 9.00 176.50 562.13 a 993.50 1378.00 7847.41
1933 1173.50 1335.00 1100.00 657.00 254.72 a 19.50 4.50 22.00 57.86 b 545.50 994.50 1400.17 a 7564.24
1934 1248.50 1356.00 1131.00 645.50 113.15 a 12.50 7.50 96.50 176.50 390.50 756.50 1441.50 7375.65
1935 1599.08 a 1208.15 a 1019.50 621.50 351.00 119.50 0.00 a 44.50 157.00 470.50 964.00 1356.00 7910.73
1936 1676.00 1768.00 1036.50 744.00 122.40 b 61.50 0.00 3.00 109.50 570.50 985.34 a 1238.00 8314.74
1937 1599.00 1333.50 1145.00 642.50 219.50 56.50 4.00 4.50 199.00 583.50 974.00 1455.45 a 8216.45
1938 1527.50 1139.00 867.00 540.00 267.12 a 45.50 4.00 5.00 122.50 309.50 852.50 1324.50 7004.12
1939 1301.50 1375.00 1086.50 676.50 175.00 49.50 4.50 14.50 146.00 505.50 853.50 1072.50 7260.50
1940 1671.93 a 1225.50 1224.50 686.00 334.00 45.50 21.00 57.00 139.00 421.50 971.50 1282.37 a 8079.80
1941 1406.50 1326.50 1238.00 425.50 151.00 69.00 15.00 17.50 121.00 443.00 780.00 1087.00 7080.00
1942 1424.40 b 1287.00 947.00 417.50 269.00 71.50 21.00 35.13 a 237.50 435.07 b 905.00 1457.00 a 7507.10
1943 1606.12 b 1266.50 1288.57 a 658.00 293.50 68.50 3.50 16.00 262.76 a 473.50 985.00 1252.00 8173.95
1944 1171.50 1215.00 1189.00 703.50 182.50 42.00 3.50 25.50 133.50 447.50 735.50 1419.50 7268.50
1945 1586.50 1294.74 a 768.00 560.50 377.50 171.00 28.50 24.50 229.50 589.00 986.50 1530.00 8146.24
1946 1438.92 a 1298.50 776.50 496.00 336.35 a 125.00 11.00 52.50 186.43 b 391.50 874.00 1285.50 7272.20
1947 1376.92 a 1374.50 1122.50 738.50 446.50 134.00 19.12 a 7.50 194.50 231.00 1057.50 1353.67 a 8056.20
1948 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 58.00 9.50 12.50 113.50 520.50 799.00 1352.12 a 2865.12
1949 1430.00 1322.00 1077.00 581.50 240.00 27.50 1.50 26.00 240.52 a 379.50 874.00 1285.50 7485.02
1950 1521.50 1314.50 1243.50 834.50 314.50 65.50 37.50 94.50 47.50 r 360.00 1034.50 1574.00 8394.50
1951 1608.50 1306.50 1194.53 a 666.50 163.50 99.50 11.37 a 60.45 a 263.50 519.00 1205.00 1454.50 8552.85
1952 1517.50 1245.50 1213.65 a 538.50 320.00 50.00 2.50 f 20.50 191.25 b 657.50 855.50 1227.50 7837.40
1953 1348.50 1291.36 c 1041.08 a 687.50 272.50 27.00 5.00 4.50 168.00 361.00 761.00 1256.02 a 7223.46
1954 1556.50 1015.50 1091.20 a 533.50 393.50 49.00 10.50 25.00 165.00 500.00 779.00 1268.00 7386.70
1955 1491.50 1289.50 1142.50 371.50 159.50 36.50 0.00 a 9.00 126.00 430.00 1031.00 1477.00 7564.00
1956 1447.50 1340.00 1199.50 687.50 301.50 44.00 1.50 t 20.50 226.50 321.50 912.50 1240.53 b 7741.53
1957 1661.50 1186.50 1019.50 550.00 288.00 37.50 b 0.53 b 18.50 196.00 538.50 919.50 1252.00 7668.03
1958 1360.00 1355.50 987.00 562.50 258.69 b 106.00 4.00 23.50 129.50 394.50 851.00 1555.50 7587.69
1959 1701.50 1394.00 1153.00 588.50 179.91 c 38.79 a 5.74 d 0.50 152.00 609.50 1155.50 1106.00 8084.94
1960 1351.00 1233.50 1304.50 530.00 295.00 53.00 21.50 10.00 161.00 496.00 817.50 1393.00 7666.00
1961 1484.00 1058.81 a 958.50 683.79 a 312.50 49.50 4.50 7.00 197.50 419.50 915.50 1443.05 a 7534.16
1962 1625.50 1368.00 1102.00 633.50 187.00 59.50 11.00 25.12 b 239.50 435.50 885.00 1363.50 7935.12
1963 1823.00 1449.50 1033.00 521.50 327.50 54.00 5.00 38.00 154.00 235.00 772.50 1580.50 7993.50
1964 1322.00 1180.50 1077.77 a 541.50 135.00 81.00 6.50 68.50 212.00 554.00 806.50 1459.00 7444.27
1965 1573.00 1349.00 1244.50 706.00 148.50 52.00 20.00 66.65 a 246.50 484.50 889.00 1140.28 a 7919.93
1966 1757.50 1265.00 957.00 683.00 386.00 61.50 3.50 47.00 192.00 484.00 897.50 1337.50 8071.50
1967 1409.50 1443.00 1070.50 582.50 416.50 32.00 45.00 82.50 214.50 523.50 973.00 1289.50 8082.00
1968 1460.00 1363.00 798.50 522.00 321.00 74.00 22.00 66.00 135.50 444.50 887.50 1366.50 7460.50
1969 1589.00 1211.00 1193.00 544.00 256.00 202.00 22.00 11.50 200.00 567.00 935.00 1301.50 8032.00
1970 1694.50 1301.50 1122.50 552.50 247.50 52.00 9.00 11.50 154.00 402.50 922.50 1363.50 7833.50
1971 1700.50 1302.00 a 1169.00 589.50 329.12 a 44.00 14.50 35.00 120.50 273.50 854.50 1249.50 7681.62
1972 1642.00 1429.50 1195.50 708.50 179.00 70.86 a 29.97 a 39.50 160.00 370.00 f 0.00 z 1447.00 6901.83
1973 1339.50 1152.00 757.00 622.00 341.00 6.00 0.00 z 9.50 0.00 z 283.50 858.50 1341.00 6710.00
1974 1418.00 1258.00 1028.00 502.50 317.00 78.00 1.50 21.50 252.50 464.00 820.50 1186.00 7347.50
1975 1391.00 1265.00 1181.50 758.00 166.00 57.50 28.50 19.00 262.50 380.00 720.50 1291.50 7521.00
1976 1591.00 1081.00 963.00 481.50 286.00 12.00 0.00 44.50 193.50 613.00 1071.50 1606.50 7943.50
1977 1840.00 1177.50 809.50 455.00 85.00 100.50 1.50 54.00 144.00 538.00 938.50 1450.00 7593.50
1978 1659.50 1421.50 1142.00 685.00 266.50 86.00 34.00 0.00 z 141.72 a 543.50 920.50 1443.50 8343.72
1979 1814.00 1511.50 1098.00 686.50 366.50 79.50 10.50 45.50 144.00 595.50 930.00 1199.00 8480.50
1980 1482.00 1382.00 1173.00 557.50 215.00 89.50 7.50 16.50 191.50 657.00 887.50 1398.00 8057.00
1981 1479.00 1174.50 928.50 521.50 314.00 45.50 19.50 22.00 225.00 627.00 813.00 1342.50 7512.00
1982 1833.50 1354.50 1117.00 709.50 147.00 155.50 5.00 67.00 245.00 489.50 938.50 1149.50 8211.50
1983 1324.00 1065.56 a 981.50 690.50 426.00 80.00 8.50 2.00 195.00 491.50 836.00 1680.20 a 7780.76
1984 1561.50 1037.00 1212.00 536.50 345.50 12.00 15.00 20.50 214.50 436.50 888.50 1296.00 7575.50
1985 1585.50 1354.50 881.00 473.50 144.50 105.00 a 9.00 28.00 212.50 513.00 1051.50 1677.50 8035.50
1986 1475.50 1277.00 962.00 469.50 214.00 57.50 17.00 57.00 177.00 509.50 1023.50 1227.00 7466.50
1987 1317.50 1029.00 885.50 457.50 217.00 29.00 9.00 25.00 120.00 672.50 804.00 1141.50 6707.50
1988 1623.50 1415.00 1017.00 564.00 173.50 59.50 11.50 24.50 141.50 664.00 855.50 1323.00 7872.50
1989 1283.50 1406.00 1198.00 651.50 310.50 94.00 14.00 18.50 196.00 482.50 994.50 1637.00 8286.00
1990 1149.00 1162.00 916.50 535.00 370.50 71.50 16.50 36.00 150.00 600.50 777.50 1391.50 7176.50
1991 1607.50 1150.50 971.50 515.00 228.50 27.50 13.50 28.50 265.50 520.50 1062.50 1299.50 7690.50
1992 1298.00 1102.50 1036.50 705.50 269.50 120.50 53.50 89.00 228.50 544.50 984.00 1330.50 7762.50
1993 1489.00 1293.00 1063.00 738.50 279.50 113.00 2.50 22.00 324.50 578.50 966.00 1271.00 8140.50
1994 1809.50 1429.00 985.00 617.00 270.00 57.00 24.50 57.00 97.00 430.50 780.00 1139.00 7695.50
1995 1399.00 1257.00 961.50 747.50 288.00 44.48 a 15.50 2.07 a 247.00 487.50 1151.50 1452.50 8053.55
1996 1578.50 1360.00 1235.00 714.50 396.00 65.50 23.50 18.50 190.00 514.50 1068.00 1372.50 8536.50
1997 1568.00 1156.00 1052.00 640.50 438.00 36.00 33.00 67.00 116.50 495.50 968.00 1124.50 7695.00
1998 1340.50 940.50 957.00 514.50 125.50 117.50 0.00 0.50 66.50 445.00 759.50 1133.50 6400.50
1999 1573.50 1017.00 946.00 485.50 190.50 72.00 0.00 24.00 213.50 542.50 686.50 1283.00 7034.00
2000 1494.00 1116.00 779.50 621.50 239.50 84.00 21.00 18.50 236.79 b 458.80 a 0.00 z 1745.96 c 6815.55
2001 1364.50 1343.50 1107.00 499.00 223.50 111.00 17.50 10.00 232.24 a 564.00 641.00 1156.00 7269.24
2002 1240.00 1084.50 1220.00 623.50 399.50 67.00 5.00 12.50 130.50 682.50 972.50 1244.00 7681.50
2003 1575.00 1427.50 1082.00 650.00 322.50 93.50 11.50 12.00 207.00 567.00 938.00 1232.50 8118.50
2004 1696.00 1290.00 958.50 588.50 354.50 114.00 30.50 133.50 94.50 533.50 850.50 1367.50 8011.50
2005 1582.00 1141.00 1187.50 517.50 368.50 19.00 21.00 21.00 110.50 481.50 895.00 1441.50 7786.00
2006 1124.00 1272.50 985.50 431.00 274.00 56.00 2.00 8.50 231.00 669.50 829.00 1154.00 7037.00
2007 1332.00 1445.50 927.50 641.00 200.50 43.50 9.00 33.00 174.00 399.00 956.50 1480.50 7642.00
2008 1539.00 1498.00 1224.00 610.00 372.00 52.50 7.50 26.00 146.00 540.00 929.00 1608.50 8552.50
2009 1800.00 1246.50 1112.50 648.00 268.50 111.00 45.50 50.50 120.50 678.00 737.50 1407.00 8225.50
2010 1482.50 1199.00 843.50 417.00 249.00 28.50 2.00 8.00 235.50 481.00 909.00 1445.50 7300.50
2011 1597.53 a 1284.89 a 1152.68 a 689.50 347.00 76.50 1.00 0.50 252.50 472.00 827.50 1190.00 7891.61
2012 1333.50 1101.00 590.50 569.50 151.50 47.00 3.50 26.00 215.69 a 390.50 i 0.00 z 0.00 z 4038.19
Period of Record Statistics
MEAN 1518.73 1296.91 1066.48 604.04 275.83 70.86 13.58 31.96 182.10 495.37 907.72 1358.44 7816.23
S.D. 179.41 152.33 151.48 101.37 88.11 40.66 11.94 25.49 55.77 109.72 113.52 153.54 474.46
SKEW 0.27 0.27 -0.33 -0.01 0.02 0.90 1.14 1.37 -0.02 0.13 0.19 0.18 -0.02
MAX 2115.50 1768.00 1416.00 835.50 509.00 202.00 53.50 133.50 324.50 835.00 1205.00 1745.96 9151.00
MIN 1124.00 940.50 590.50 353.50 85.00 3.50 0.00 0.50 57.86 231.00 641.00 1040.50 6400.50
NO YRS 115 116 114 114 112 114 112 111 111 109 111 115 94