DULUTH INTL AP, MINNESOTA

Monthly Total Heating Degree Days

(212248)

Base Temperature = 65 F

File last updated on Apr 6, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1948 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 615.00 1059.00 1581.00 3255.00
1949 1666.00 1600.15 a 1388.50 694.50 445.00 114.50 53.00 68.50 365.00 614.50 1032.50 1630.00 9672.15
1950 1981.50 1474.50 1512.00 1088.50 590.50 218.50 138.00 234.50 306.50 594.50 1285.50 1774.00 11198.50
1951 1857.00 1458.50 1453.50 840.00 373.50 233.00 91.50 189.00 421.00 712.50 1308.50 1676.00 10614.00
1952 1782.00 1325.00 1360.50 623.00 427.00 152.50 44.00 113.00 285.50 816.00 1041.50 1358.50 9328.50
1953 1661.00 1467.50 1231.50 905.00 481.50 183.00 61.50 48.50 320.50 459.32 a 947.00 1530.50 9296.82
1954 1893.00 1156.50 1393.00 850.00 647.50 146.50 59.00 94.00 354.00 721.50 992.50 1417.00 9724.50
1955 1709.00 1537.00 1505.00 581.00 378.00 131.00 26.50 31.50 321.00 617.00 1320.50 1755.00 9912.50
1956 1632.50 1565.50 1415.00 938.00 534.00 160.50 129.00 117.50 433.00 486.50 1109.00 1538.50 10059.00
1957 1978.50 1508.00 1337.50 777.50 480.50 232.50 38.00 85.00 379.00 675.50 1109.00 1471.50 10072.50
1958 1529.00 1527.00 1183.00 715.00 458.50 303.50 106.00 118.00 292.50 613.00 1079.00 1825.00 9749.50
1959 1947.00 1553.00 1230.50 819.50 446.00 165.50 47.50 66.50 316.00 797.00 1387.50 1285.50 10061.50
1960 1690.50 1495.00 1485.00 793.00 455.50 211.00 68.50 66.50 307.50 613.00 1006.00 1631.50 9823.00
1961 1770.00 1267.50 1106.50 891.00 477.00 165.50 62.00 35.00 349.50 604.00 1076.00 1616.00 9420.00
1962 1912.50 1610.00 1262.00 925.00 474.00 269.50 139.50 126.00 395.50 618.00 936.50 1563.00 10231.50
1963 1988.00 1622.00 1164.50 719.50 477.00 165.50 52.50 111.50 221.50 286.50 880.50 1717.50 9406.50
1964 1491.50 1412.00 1403.50 789.50 343.50 242.50 54.50 220.00 384.00 638.50 1044.50 1757.00 9781.00
1965 1855.50 1653.00 1526.00 812.00 405.00 216.00 131.00 164.50 511.50 625.50 1117.50 1361.50 10379.00
1966 2053.00 1476.50 1174.50 911.00 552.50 170.00 40.00 147.50 311.00 676.50 1193.50 1597.00 10303.00
1967 1668.50 1716.00 1249.00 842.00 600.50 217.50 84.00 147.50 275.50 702.00 1153.50 1510.50 10166.50
1968 1735.00 1616.50 1024.00 737.50 516.00 236.00 94.50 146.00 260.00 584.50 1082.00 1647.00 9679.00
1969 1783.00 1417.00 1353.50 732.50 457.00 341.00 102.50 21.50 263.50 753.50 1082.00 1474.50 9781.50
1970 1941.00 1584.00 1361.50 789.50 579.50 167.50 38.00 69.50 314.50 640.50 1117.00 1623.00 10225.50
1971 1998.50 1467.50 1339.50 801.50 525.00 129.50 116.50 137.50 277.50 538.00 1106.50 1561.00 9998.50
1972 2009.50 1699.50 1461.50 953.50 365.50 219.50 139.00 150.50 449.00 810.00 1175.00 1794.50 11227.00
1973 1657.00 1436.00 1029.50 800.50 534.00 178.00 76.00 68.50 361.50 520.50 1115.00 1654.00 9430.50
1974 1842.00 1514.00 1377.50 813.00 572.50 211.00 48.00 166.50 515.00 690.00 1076.50 1411.50 10237.50
1975 1719.00 1484.00 1452.50 1021.50 366.00 232.00 47.50 134.50 423.00 569.00 1011.50 1649.50 10110.00
1976 1869.50 1285.50 1334.50 673.50 448.00 106.50 37.00 116.50 316.50 865.50 1287.00 1875.00 10215.00
1977 2019.50 1340.50 1040.50 618.50 248.50 173.50 50.00 203.50 355.50 642.50 1110.00 1665.50 9468.00
1978 1858.00 1525.50 1221.50 800.50 333.00 180.00 76.00 103.50 270.00 624.00 1166.00 1703.50 9861.50
1979 1998.50 1680.00 1302.00 916.50 557.00 179.00 55.50 121.00 258.50 682.50 1067.50 1326.00 10144.00
1980 1747.00 1577.00 1404.00 708.50 335.50 209.50 41.50 81.00 364.50 809.00 1049.50 1656.00 9983.00
1981 1648.00 1362.50 1139.50 775.50 461.00 191.00 77.00 67.00 369.00 761.50 911.50 1556.50 9320.00
1982 2115.00 1524.00 1370.00 879.50 379.00 307.50 69.50 164.50 337.00 618.00 1218.50 1407.50 10390.00
1983 1604.50 1231.50 1222.00 896.50 567.50 192.50 31.50 11.00 293.00 624.00 1004.00 1960.00 9638.00
1984 1795.50 1218.00 1435.00 678.50 453.50 121.50 41.50 43.00 396.00 598.00 1098.50 1607.00 9486.00
1985 1814.00 1496.50 1076.50 688.50 322.00 258.50 62.00 184.00 402.00 692.00 1353.00 1923.00 10272.00
1986 1653.00 1498.50 1133.50 688.50 421.50 200.50 80.00 157.50 370.00 671.00 1231.00 1432.00 9537.00
1987 1542.00 1158.00 1035.50 568.00 383.50 115.00 37.50 105.50 240.00 793.00 984.00 1384.00 8346.00
1988 1865.00 1706.00 1259.50 749.00 304.50 147.50 23.50 101.00 293.50 820.00 1085.00 1596.00 9950.50
1989 1573.00 1725.00 1431.00 848.50 413.50 213.50 30.50 83.00 281.00 638.00 1255.50 1888.00 10380.50
1990 1436.50 1403.50 1175.00 751.50 517.50 136.00 82.50 98.50 278.00 709.50 1008.00 1624.00 9220.50
1991 1833.00 1278.00 1207.50 670.50 336.00 133.50 103.00 71.00 369.50 763.00 1291.00 1522.50 9578.50
1992 1498.50 1272.00 1212.50 865.00 361.00 277.50 181.00 174.00 339.00 727.00 1131.00 1523.00 9561.50
1993 1646.50 1415.00 1177.50 835.00 458.00 245.00 77.50 75.00 464.50 776.50 1220.00 1489.50 9880.00
1994 2080.00 1639.50 1130.00 762.50 357.50 109.00 64.00 118.50 203.50 552.00 941.00 1354.50 9312.00
1995 1591.00 1493.50 1142.50 910.50 398.50 101.50 44.50 19.50 312.00 663.50 1332.00 1639.50 9648.50
1996 1946.00 1540.50 1415.00 940.50 522.50 179.50 111.50 42.00 285.00 663.00 1303.00 1668.50 10617.00
1997 1797.00 1413.00 1287.50 881.00 596.00 111.00 100.00 160.50 233.50 655.50 1203.00 1313.00 9751.00
1998 1507.50 1009.00 1227.00 628.00 289.50 198.50 54.50 23.50 202.00 591.00 987.50 1436.50 8154.50
1999 1729.00 1225.50 1154.50 707.50 365.50 163.50 39.50 80.50 334.00 703.00 887.07 a 1404.00 8793.57
2000 1710.68 a 1264.00 981.00 806.50 378.00 279.50 79.00 56.00 341.50 563.50 1091.50 1880.00 9431.18
2001 1476.50 1604.00 1257.50 757.00 378.50 170.00 69.00 50.50 307.00 670.50 765.50 1328.00 8834.00
2002 1463.00 1219.50 1449.00 834.00 580.00 162.50 29.50 72.50 245.50 910.50 1183.97 a 1391.50 9541.47
2003 1736.50 1564.50 1306.00 803.50 444.50 178.00 52.00 37.50 282.00 645.00 1151.00 1379.50 9580.00
2004 1893.00 1338.00 1140.50 769.50 566.50 243.00 95.00 206.00 200.00 611.00 948.00 1580.50 9591.00
2005 1777.50 1279.00 1297.50 659.50 499.00 141.50 57.50 78.00 192.50 591.00 1030.50 1466.50 9070.00
2006 1279.00 1491.00 1126.50 580.50 377.50 95.50 11.50 35.50 326.50 782.00 996.00 1276.50 8378.00
2007 1590.50 1597.50 1102.50 785.00 351.50 103.50 63.50 65.00 261.50 535.00 1084.50 1601.00 9141.00
2008 1705.00 1588.50 1323.50 814.50 512.00 171.00 65.00 69.50 281.00 0.00 z 1084.00 1778.88 a 9392.88
2009 1914.00 1394.00 1253.50 759.00 460.00 218.50 105.00 128.50 110.00 804.50 813.50 1631.00 9591.50
2010 1686.00 1386.00 866.50 568.50 360.50 174.00 4.00 40.00 389.50 561.00 1035.50 1617.50 8689.00
2011 1795.50 1413.00 1270.50 777.50 475.50 210.00 30.00 27.00 294.00 520.50 957.00 1341.00 9111.50
2012 1458.00 1198.00 799.00 677.00 324.50 81.50 0.50 50.50 287.50 698.50 1022.00 1446.00 8043.00
2013 1639.50 1411.50 1327.46 c 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 4378.46
Period of Record Statistics
MEAN 1754.51 1452.46 1258.70 784.35 445.32 185.82 67.51 100.01 320.31 658.25 1094.35 1570.53 9688.88
S.D. 181.38 157.32 155.78 109.68 90.35 55.92 35.90 55.02 75.50 105.67 131.73 167.98 629.01
SKEW -0.17 -0.45 -0.52 0.12 0.13 0.43 0.76 0.47 0.20 -0.31 0.11 0.27 -0.32
MAX 2115.00 1725.00 1526.00 1088.50 647.50 341.00 181.00 234.50 515.00 910.50 1387.50 1960.00 11227.00
MIN 1279.00 1009.00 799.00 568.00 248.50 81.50 0.50 11.00 110.00 286.50 765.50 1276.50 8043.00
NO YRS 65 65 65 64 64 64 64 64 64 64 65 65 63