DULUTH HARBOR STN, MINNESOTA

Monthly Total Heating Degree Days

(212246)

Base Temperature = 65 F

File last updated on Apr 6, 2013
*** Note *** Provisional Data *** After Year/Month 200409
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
1933 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
1934 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
1935 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
1936 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
1937 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
1938 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
1939 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
1940 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
1941 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
1942 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
1943 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
1944 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
1945 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
1946 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
1947 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
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 0.00 z 0.00 z 0.00 z 0.00
1949 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
1950 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
1951 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
1952 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
1953 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
1954 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
1955 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
1956 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
1957 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
1958 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
1959 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
1960 0.00 z 0.00 z 1366.50 780.50 583.00 247.50 56.50 31.50 233.00 508.50 963.00 1543.00 6313.00
1961 1650.50 1162.50 1034.50 851.50 534.00 169.50 61.50 9.00 263.50 499.50 961.50 1434.00 8631.50
1962 1789.50 1513.00 1183.00 837.50 572.00 337.00 108.00 64.00 232.50 490.50 843.50 1441.00 9411.50
1963 1877.50 1508.50 1113.50 783.00 563.00 237.41 a 26.50 53.22 a 164.00 243.00 809.50 1634.00 9013.13
1964 1405.00 1280.50 1289.00 804.50 355.00 289.50 46.00 135.00 290.00 546.00 969.00 1585.00 8994.50
1965 1738.50 1569.50 1369.50 814.00 553.50 294.00 126.00 108.00 382.50 553.00 984.50 1213.50 9706.50
1966 1900.00 1354.50 1105.50 849.00 545.50 204.50 26.50 89.00 172.50 583.00 1071.50 1435.00 9336.50
1967 1549.48 a 1592.50 1185.00 831.50 592.00 290.50 67.50 76.50 202.00 586.00 1023.00 1382.50 9378.48
1968 1604.00 1477.00 1004.00 714.50 584.50 282.50 88.50 143.50 195.50 489.50 924.50 1460.50 8968.50
1969 1654.00 1318.50 1214.00 773.50 468.00 348.00 128.00 9.50 121.50 633.00 873.00 1341.00 8882.00
1970 1796.00 1418.00 1229.00 828.00 639.50 265.50 28.00 32.00 221.50 585.00 989.50 1386.00 9418.00
1971 1811.50 1436.00 1225.50 799.50 594.00 263.00 93.00 91.00 206.00 454.00 982.00 1427.50 9383.00
1972 1855.50 1563.00 1354.00 956.50 665.50 335.50 139.50 134.00 302.00 692.00 1042.50 1653.50 10693.50
1973 1530.50 1295.50 1007.50 773.00 570.50 282.50 42.22 b 33.50 228.50 448.50 979.50 1477.00 8668.72
1974 1658.50 1376.50 1270.50 851.00 667.50 216.00 64.50 86.50 379.50 584.00 911.00 1237.00 9302.50
1975 1565.00 1362.00 1307.00 961.00 458.50 270.50 28.50 72.00 325.50 481.00 857.00 1461.00 9149.00
1976 1725.00 1189.50 1199.00 710.50 476.00 178.50 18.00 48.50 297.50 725.40 a 1185.00 1780.50 9533.40
1977 1953.00 1290.00 1065.00 717.93 a 448.47 a 217.76 a 38.48 b 136.40 a 291.96 b 497.00 999.11 b 1504.00 9159.11
1978 1698.91 c 1419.50 1177.50 813.62 a 476.50 209.00 69.50 56.50 223.97 a 516.00 1059.50 1603.00 9323.50
1979 1959.72 a 1691.00 1279.50 908.00 660.00 251.00 86.50 112.50 190.50 629.50 1005.50 1248.50 10022.22
1980 1630.50 1435.00 1280.50 686.00 304.50 0.00 z 2.50 15.50 210.00 584.00 850.00 1448.50 8447.00
1981 1459.50 1199.50 975.50 704.00 542.00 240.50 58.00 12.00 210.00 613.00 792.00 1409.50 8215.50
1982 1988.13 a 1280.00 1220.00 816.00 516.00 257.00 74.00 115.00 363.50 530.50 1065.50 1283.50 9509.13
1983 1459.00 1096.50 1111.00 798.50 601.50 302.00 43.00 0.50 269.50 571.00 930.50 1815.00 8998.00
1984 1653.50 1104.00 1313.00 780.00 514.00 249.00 35.00 31.50 297.50 572.00 993.00 1509.00 9051.50
1985 1707.50 1430.00 1047.50 766.50 455.00 294.50 42.50 157.00 299.00 525.50 1166.50 1785.00 9676.50
1986 1526.00 1407.00 1068.50 710.00 498.50 202.00 87.00 67.00 297.50 565.50 1093.50 1316.00 8838.50
1987 1410.50 1050.00 1021.00 603.00 471.00 94.14 a 20.50 39.50 118.00 640.00 826.61 b 1226.50 7520.75
1988 1700.00 1566.60 e 1172.50 729.00 211.50 n 0.00 z 0.00 z 56.50 243.00 707.50 984.00 828.00 m 7159.10
1989 1499.50 1609.00 1399.50 883.00 535.00 309.31 a 49.00 45.50 203.00 636.50 1146.00 1774.00 10089.31
1990 1346.00 1339.50 1136.50 806.50 591.50 0.00 z 0.00 z 42.50 165.50 580.00 914.50 1465.50 8388.00
1991 1758.45 b 1273.00 1217.27 a 783.00 523.90 a 249.50 49.50 n 7.00 i 255.50 653.00 1205.00 1447.00 9365.62
1992 1463.20 a 1219.50 1150.50 823.00 389.50 282.50 119.00 83.00 294.50 609.50 1022.50 1393.00 8849.70
1993 1657.50 1327.50 1205.00 847.50 458.00 303.00 62.50 0.00 z 377.00 0.00 z 1080.00 1427.00 8745.00
1994 2025.00 1615.00 1124.00 726.50 0.00 z 173.50 17.00 r 80.50 188.00 485.00 840.00 1261.00 8518.50
1995 1524.50 1409.50 1197.50 913.00 491.35 a 201.00 49.00 34.50 0.00 z 613.50 1263.00 1596.00 9292.85
1996 1873.00 1547.50 1459.00 948.50 689.75 a 318.00 115.73 a 27.50 224.50 600.00 1227.00 1581.00 10611.48
1997 1756.00 1399.50 1311.00 912.50 684.00 106.50 f 118.00 87.50 139.50 631.50 1080.00 1153.50 9273.00
1998 1428.00 0.00 z 532.00 n 653.00 436.07 a 223.50 17.00 3.50 115.00 502.50 877.00 1319.00 5574.57
1999 1661.00 1161.00 1087.00 736.50 466.50 145.34 a 43.50 53.00 222.50 645.00 787.00 1294.50 8302.84
2000 1615.50 1234.50 946.50 787.50 410.50 0.00 z 0.00 z 14.98 a 234.00 513.50 970.50 1751.50 8478.98
2001 1431.00 1536.50 1195.50 757.00 388.50 224.50 0.00 z 31.50 238.00 622.58 a 688.00 1202.00 8315.08
2002 1386.00 1153.50 1401.00 890.50 634.00 243.00 53.50 168.95 a 297.50 775.00 1063.00 1309.50 9375.45
2003 1645.50 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 1060.50 1307.50 4013.50
2004 1799.50 1399.00 1098.00 724.50 629.50 273.10 a 154.50 277.00 297.50 0.00 z 0.00 z 0.00 z 6652.60
Period of Record Statistics
MEAN 1661.96 1371.68 1188.76 798.73 529.47 250.64 65.46 70.63 243.81 569.55 985.44 1449.36 9226.27
S.D. 177.20 159.62 125.03 80.37 92.55 54.97 38.40 55.29 68.84 90.45 126.69 172.74 641.44
SKEW 0.16 -0.08 0.11 0.04 -0.22 -0.57 0.60 1.41 0.15 -0.75 0.05 0.48 -0.02
MAX 2025.00 1691.00 1459.00 961.00 689.75 348.00 154.50 277.00 382.50 775.00 1263.00 1815.00 10693.50
MIN 1346.00 1050.00 946.50 603.00 304.50 94.14 2.50 0.50 115.00 243.00 688.00 1153.50 7520.75
NO YRS 44 42 43 44 42 39 38 42 43 42 44 43 31