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
1893 1921.00 1509.50 1196.60 a 751.50 379.50 44.50 1.00 52.00 206.00 493.50 1013.00 1512.50 9080.60
1894 1499.00 1359.00 887.50 518.00 266.50 41.00 3.50 12.50 154.00 506.00 1105.00 1155.50 7507.50
1895 1736.00 1518.00 1103.50 451.00 259.00 24.50 11.50 11.00 137.00 674.00 994.00 1276.50 8196.00
1896 1406.50 1238.50 1191.50 450.00 119.50 41.00 19.50 46.50 278.00 602.50 1098.00 1206.50 7698.00
1897 1557.00 1182.00 1156.50 600.50 299.00 110.00 5.50 51.50 89.50 356.50 1011.00 1504.50 7923.50
1898 1321.00 1222.00 913.00 614.00 229.00 21.50 6.50 22.50 130.00 591.50 1006.00 1526.50 7603.50
1899 1539.00 1569.50 1368.50 522.50 234.50 43.50 4.00 7.50 231.00 353.50 698.00 1401.00 7972.50
1900 1332.50 1499.00 1219.50 450.00 190.00 44.50 12.50 0.00 174.50 272.50 1037.00 1279.50 7511.50
1901 1428.50 1474.50 1110.50 507.00 236.50 76.00 6.50 6.00 207.00 439.00 996.50 1495.50 7983.50
1902 1430.00 1374.50 912.50 609.50 223.72 a 149.50 18.50 58.50 220.00 463.45 a 752.50 1493.50 7706.17
1903 1505.00 1323.50 877.50 583.50 201.00 124.50 26.00 85.50 233.28 a 487.00 1032.50 1639.50 8118.78
1904 1738.50 1590.50 1092.00 719.50 269.00 53.50 19.00 81.50 137.00 476.50 801.50 1426.50 8405.00
1905 1769.50 1494.50 925.00 582.00 314.00 53.50 15.00 8.00 95.50 562.00 884.50 1247.00 7950.50
1906 1341.00 1297.00 1284.00 419.50 256.50 58.00 5.00 13.50 87.00 499.50 920.50 1316.50 7498.00
1907 1555.68 a 1260.50 892.00 783.00 470.00 91.50 7.50 42.50 222.50 532.50 909.50 1222.50 7989.68
1908 1346.00 1260.50 966.50 562.00 233.50 88.00 9.50 41.00 100.00 478.00 834.50 1340.50 7260.00
1909 1436.00 1211.00 1115.50 738.00 297.50 62.00 12.50 9.00 183.50 584.50 725.00 1571.00 7945.50
1910 1515.90 a 1396.50 601.00 413.50 333.50 79.00 0.00 7.50 162.00 378.00 1072.50 1432.00 7391.40
1911 1495.00 1121.00 881.50 598.50 136.00 11.00 19.00 42.50 137.00 529.00 1122.00 1182.00 7274.50
1912 2043.00 1487.00 1277.00 506.50 201.50 92.50 25.50 38.50 197.50 426.50 804.00 1181.50 8281.00
1913 1457.50 1375.00 1117.00 503.00 291.00 68.50 6.50 13.00 223.50 556.50 784.00 1081.50 7477.00
1914 1320.71 b 1535.00 1063.54 e 592.00 222.00 77.50 5.00 42.37 a 161.00 329.00 853.00 1583.50 7784.61
1915 1591.00 1111.00 1165.50 342.50 424.50 143.50 43.50 146.50 152.50 439.00 843.50 1340.00 7743.00
1916 1486.00 1418.50 1089.00 617.00 286.50 148.97 a 0.00 a 31.50 221.54 d 506.00 991.03 a 1547.50 8343.54
1917 1640.00 1552.00 1097.00 658.50 398.50 137.00 20.00 55.00 224.00 835.97 a 834.50 1661.50 9113.97
1918 1861.03 a 1298.00 858.50 738.50 208.00 82.50 29.50 21.00 322.00 408.50 812.07 a 1122.50 7762.10
1919 1298.50 1201.93 a 994.50 573.10 a 323.43 a 28.00 2.50 13.00 u 102.50 529.00 1019.50 1715.00 7787.96
1920 1737.00 1435.50 1058.50 805.50 0.00 z 0.00 z 11.50 f 38.50 0.00 z 0.00 z 0.00 z 0.00 z 5075.00
1921 0.00 z 568.50 o 895.56 d 435.00 242.00 40.50 0.00 z 33.67 b 100.00 495.50 1083.50 1270.43 d 4596.15
1922 1565.00 1290.69 b 984.77 a 587.00 125.50 44.00 29.50 23.00 j 166.00 425.00 766.50 1409.50 7393.46
1923 1417.00 1492.50 1303.50 657.50 259.00 49.29 b 2.00 q 48.29 e 194.46 b 591.00 838.50 1064.69 b 7915.73
1924 1809.00 1310.50 1196.50 600.00 499.00 138.60 e 52.00 60.50 325.96 d 325.00 988.80 e 1667.50 8973.36
1925 1516.50 1187.50 938.00 422.59 a 176.50 k 47.50 h 37.20 a 17.64 b 110.00 862.50 918.00 e 1539.00 7548.92
1926 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
1927 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
1928 0.00 z 1205.50 997.50 732.50 158.00 69.00 0.00 16.02 a 208.50 413.50 854.00 1245.00 5899.52
1929 1827.45 a 1475.50 908.50 526.55 a 375.50 76.00 12.29 b 24.00 205.00 494.45 a 1016.79 b 1360.50 8302.53
1930 1720.00 985.19 a 1002.00 529.14 a 250.00 44.44 c 5.00 h 3.00 119.00 558.52 a 809.50 1302.00 a 7322.78
1931 1200.50 933.33 a 1025.07 a 481.55 a 324.47 a 33.33 c 0.00 33.21 c 53.57 b 372.00 a 730.50 1039.50 6227.04
1932 1338.68 a 1188.48 a 1282.00 588.50 197.37 a 0.52 a 3.50 0.50 176.00 568.50 1019.50 1376.40 a 7739.95
1933 1142.50 1352.96 c 1034.50 603.00 240.52 b 16.00 0.00 6.72 a 75.00 a 540.00 978.50 1352.63 a 7342.33
1934 1274.21 b 1325.52 c 1106.18 a 615.00 92.48 a 5.50 0.00 54.00 188.00 356.00 774.83 a 1472.00 7263.72
1935 1593.40 a 1145.50 873.17 a 636.50 348.23 a 103.00 0.00 35.50 133.00 485.84 b 999.00 1441.50 a 7794.64
1936 1730.50 1753.50 959.50 734.48 a 127.62 a 73.50 0.00 8.00 135.00 602.95 a 1038.00 1239.00 8402.05
1937 1621.50 1359.50 1120.28 b 609.00 211.00 64.50 3.50 1.00 185.00 597.00 996.00 1419.00 8187.28
1938 1450.00 1089.00 824.50 568.50 299.15 a 41.79 b 0.00 10.50 151.20 e 292.50 901.00 1320.50 6948.64
1939 1329.00 1447.50 1078.00 644.48 a 149.50 36.11 c 4.50 0.00 z 150.00 514.00 776.50 0.00 z 6129.59
1940 1768.55 a 1222.00 1203.00 637.50 315.34 b 30.00 12.40 a 35.81 b 145.00 360.00 1012.50 1298.90 a 8041.00
1941 1430.59 d 1321.00 1183.00 387.93 a 127.00 75.00 4.00 15.00 109.50 428.00 814.50 1158.88 a 7054.41
1942 1476.50 1319.00 955.12 b 447.50 326.50 51.21 a 9.00 24.00 259.00 440.72 a 959.00 1546.50 7814.04
1943 1337.00 g 1297.69 b 1278.00 640.86 a 355.00 45.00 7.00 28.00 284.50 492.00 1052.50 1304.00 6784.55
1944 1203.00 1253.50 1216.00 709.50 202.50 61.00 10.50 25.50 134.00 464.00 790.00 1502.00 7571.50
1945 1618.00 1283.00 751.00 584.00 418.00 171.00 28.50 30.00 204.00 539.50 946.00 1539.50 8112.50
1946 1416.50 1270.50 715.50 454.50 289.00 92.00 0.50 45.50 165.50 360.00 880.00 1253.50 6943.00
1947 1343.00 1376.50 1140.50 682.50 401.00 109.50 17.50 5.00 167.50 207.50 1057.50 1362.00 7870.00
1948 1640.50 1351.00 1068.50 438.00 281.50 33.00 8.50 7.00 57.00 445.50 805.50 1337.00 7473.00
1949 1508.67 a 1341.50 1075.00 407.00 m 0.00 z 0.00 z 0.00 z 4.50 238.00 328.60 a 846.00 1335.50 6677.77
1950 1546.26 b 1319.00 1245.50 820.00 288.09 b 63.50 28.00 64.00 134.50 341.00 1053.62 a 1593.40 a 8496.87
1951 1629.50 1307.92 b 1236.26 b 708.50 148.80 a 81.50 14.98 a 40.00 188.57 b 479.47 a 1202.50 1452.00 8490.00
1952 1518.50 1148.61 a 1207.50 531.50 272.50 55.50 3.50 34.62 a 168.50 643.00 845.89 b 1319.05 a 7748.67
1953 1411.00 1266.00 1063.41 c 751.55 a 307.86 b 34.29 b 8.02 b 2.50 159.31 a 313.00 810.50 1316.00 7443.44
1954 1627.50 c 961.50 1113.50 539.48 a 443.30 a 58.50 0.00 b 14.50 149.50 508.00 828.62 a 1300.50 7544.90
1955 1499.50 1320.50 1152.17 a 373.39 b 171.02 a 67.50 0.00 6.50 130.00 475.16 b 1124.50 1572.00 7892.23
1956 1489.00 1376.50 1190.00 681.43 b 309.50 36.50 20.15 a 34.50 228.21 b 325.50 959.00 1296.66 b 7946.95
1957 1716.00 1168.50 1040.50 557.50 325.50 54.00 2.50 29.97 a 219.00 543.50 963.00 1236.90 a 7856.87
1958 1417.98 b 1392.16 c 801.00 g 568.20 e 175.00 g 83.50 f 6.00 f 0.00 w 79.00 m 296.50 f 883.20 e 1568.94 d 5830.49
1959 1774.23 a 1436.00 1173.35 a 568.00 154.00 32.50 17.00 6.00 175.00 607.00 1184.00 1086.00 8213.08
1960 1369.00 1264.00 1387.00 524.50 271.50 96.50 27.00 12.00 166.00 493.50 822.00 1369.00 7802.00
1961 1503.50 1053.50 986.00 740.00 336.00 62.00 9.00 15.00 215.50 422.50 917.50 1461.50 7722.00
1962 1640.50 1338.50 1167.00 641.00 164.50 68.50 31.50 31.00 253.00 421.00 877.50 1365.50 7999.50
1963 1852.50 1444.00 940.00 505.00 297.50 44.00 2.00 50.00 154.00 194.50 756.00 1656.00 7895.50
1964 1289.00 1139.50 1100.00 534.00 126.00 60.00 5.50 75.00 203.00 568.00 791.00 1471.50 7362.50
1965 1572.50 1380.50 1286.50 642.50 168.50 55.50 0.00 z 57.50 222.00 474.00 868.50 1120.50 7848.50
1966 1757.50 1295.50 891.50 658.50 387.00 64.50 5.00 45.50 215.00 491.50 891.00 1356.00 8058.50
1967 1401.50 1457.50 1005.50 549.50 399.50 32.00 49.00 71.00 206.50 543.50 989.50 1280.00 7985.00
1968 1456.00 1367.50 784.50 494.00 328.00 80.50 21.00 45.50 181.50 453.50 911.00 1381.50 7504.50
1969 1629.00 1241.00 1284.50 494.00 243.00 179.00 7.00 6.50 190.00 581.00 940.00 1364.00 8159.00
1970 1801.50 1301.50 1120.50 555.00 230.00 63.00 17.50 18.50 181.00 441.50 923.00 1381.00 8034.00
1971 1761.50 1325.50 1170.50 567.50 330.50 31.50 36.50 49.00 153.50 300.50 886.00 1258.60 a 7871.10
1972 1672.50 1439.50 1187.50 690.00 196.00 71.50 37.50 37.50 168.50 603.00 974.50 1526.50 8604.50
1973 1372.50 1153.50 750.20 a 640.00 355.98 a 26.50 3.50 16.50 199.00 311.50 888.50 1414.50 7132.18
1974 1495.00 1295.50 1022.00 513.00 342.50 91.50 6.00 44.50 267.00 470.00 842.00 1259.63 a 7648.63
1975 1467.00 1302.50 1273.50 740.50 193.50 83.50 33.00 16.00 276.00 409.50 773.28 a 1302.50 7870.78
1976 1608.79 b 1101.00 946.50 481.00 305.00 33.00 9.50 42.50 208.50 668.00 1134.00 1663.50 8201.29
1977 1959.50 1230.50 786.00 364.50 88.00 49.00 8.50 68.00 165.00 561.50 968.00 1524.00 7772.50
1978 1831.50 1548.00 1141.00 619.50 264.00 68.00 15.00 25.63 e 123.50 579.50 975.50 1509.50 8700.63
1979 1949.50 1516.50 1069.00 0.00 z 310.52 a 44.48 a 11.50 23.50 h 98.00 j 330.50 k 591.50 l 665.50 n 4901.50
1980 896.50 m 1020.50 i 1165.71 b 568.45 a 228.00 70.56 c 3.00 j 10.50 176.00 651.50 870.50 880.50 k 3741.21
1981 1016.00 j 1185.50 909.33 a 363.50 f 315.00 46.55 a 23.52 b 22.50 234.50 622.00 903.50 1483.00 5745.40
1982 1958.00 1358.50 1167.00 770.50 182.50 144.00 3.50 88.00 247.50 511.00 983.00 1196.00 8609.50
1983 1428.00 1122.00 1022.00 768.50 463.50 101.00 12.00 2.50 230.50 539.00 884.48 a 1785.00 8358.48
1984 1635.00 1054.50 1234.50 606.00 400.50 47.50 31.50 28.50 267.50 499.00 941.50 1352.50 8098.50
1985 1661.00 1374.50 904.50 449.00 165.00 147.00 14.00 81.00 259.00 523.00 1156.00 1819.50 8553.50
1986 1539.00 1340.50 959.97 a 498.00 240.50 77.50 8.00 106.50 201.50 544.00 1096.00 1287.50 7898.97
1987 1389.50 1012.50 865.00 466.00 195.50 41.50 11.00 64.00 183.00 680.50 783.50 1216.50 6908.50
1988 1646.00 1481.69 b 999.00 595.00 192.00 52.00 0.00 z 32.00 0.00 z 711.00 884.50 1382.50 7975.69
1989 1248.50 1475.00 1154.75 a 632.50 309.50 98.00 0.50 32.00 247.00 468.50 1024.00 1659.50 8349.75
1990 1172.00 1148.50 916.00 567.00 359.00 61.50 0.00 z 33.50 185.00 531.00 811.50 1452.00 7237.00
1991 1657.50 1174.00 958.50 545.50 235.00 31.00 34.00 32.50 300.50 591.00 1183.50 1361.00 8104.00
1992 1371.00 1113.50 1035.00 720.50 309.00 122.00 96.50 143.50 270.00 614.50 1055.00 1372.50 8223.00
1993 1611.48 a 1387.00 1178.00 760.00 311.50 130.50 24.50 41.00 380.00 629.50 1011.00 1338.50 8802.98
1994 1881.50 1519.50 1026.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 481.00 834.50 1219.00 6961.50
1995 1479.50 1250.00 958.50 738.50 337.00 47.00 26.50 2.00 263.50 559.00 1182.00 1473.00 8316.50
1996 1702.50 1368.50 1214.00 727.50 408.00 79.50 27.00 26.50 235.00 546.50 1190.50 1495.50 9021.00
1997 1643.00 1225.00 1073.50 679.50 456.00 57.00 53.00 88.00 195.50 539.00 1046.00 1237.50 8293.00
1998 1356.50 918.50 1020.50 518.50 161.50 125.00 8.00 7.50 105.00 486.00 820.00 1218.50 6745.50
1999 1628.00 1036.50 999.50 537.50 235.50 88.50 4.00 27.50 257.00 580.50 770.50 1279.27 a 7444.27
2000 1514.00 1075.50 797.00 604.00 270.00 112.50 32.00 15.50 207.50 442.00 1013.00 1787.50 7870.50
2001 1458.00 1400.00 1145.50 474.50 263.00 110.00 26.87 a 23.00 243.50 587.00 627.50 1167.00 7525.87
2002 1230.50 1100.50 1169.50 607.50 385.50 61.00 3.50 16.00 158.50 688.50 979.00 1247.00 7647.00
2003 1569.00 1393.50 1053.00 611.00 315.50 98.50 14.00 7.50 230.50 543.00 933.50 1231.00 8000.00
2004 1602.00 1239.00 893.00 559.50 278.00 111.00 28.50 116.00 43.50 h 0.00 z 0.00 z 0.00 z 4827.00
2005 0.00 z 0.00 z 0.00 z 272.00 o 380.27 a 14.50 7.50 21.50 98.00 476.00 951.50 1502.00 3451.27
2006 1157.50 1303.00 997.50 479.50 318.50 47.00 2.50 9.50 261.50 677.50 852.00 1176.50 7282.50
2007 1388.00 1513.62 b 917.50 661.00 214.00 41.50 6.50 23.50 167.00 396.50 973.00 1498.00 7800.12
2008 1614.00 1531.00 1230.00 657.00 364.00 38.00 1.50 18.00 137.50 567.00 939.50 1633.38 b 8730.88
2009 1817.50 1233.00 1039.50 632.00 290.50 105.00 65.00 62.50 114.00 724.50 751.50 1448.50 8283.50
2010 1621.50 1280.50 783.50 434.00 282.00 39.00 2.50 11.00 231.00 438.50 924.00 1554.50 7602.00
2011 1637.32 a 1332.00 1134.00 683.50 360.50 86.00 4.00 9.50 269.50 450.50 865.50 1225.00 8057.32
2012 1374.50 1137.50 579.50 592.50 184.50 55.00 0.50 42.50 226.00 425.00 h 0.00 z 0.00 z 4192.50
Period of Record Statistics
MEAN 1546.96 1303.22 1049.59 587.27 275.11 68.80 14.74 33.60 188.51 499.05 928.36 1385.04 7896.53
S.D. 192.21 154.85 157.59 106.10 88.96 36.66 15.76 28.48 59.89 116.22 121.02 165.78 516.46
SKEW 0.22 -0.12 -0.41 0.01 0.13 0.82 2.05 1.58 0.21 0.10 0.20 0.33 -0.13
MAX 2043.00 1753.50 1387.00 820.00 499.00 179.00 96.50 146.50 380.00 862.50 1202.50 1819.50 9113.97
MIN 1142.50 918.50 579.50 342.50 88.00 0.52 0.00 0.00 53.57 194.50 627.50 1039.50 6227.04
NO YRS 112 115 116 113 113 113 107 112 112 113 114 112 96