FLANDREAU, SOUTH DAKOTA

Monthly Total Heating Degree Days

(392984)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201302
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 1809.00 1531.00 1255.00 753.50 355.00 23.50 10.50 51.50 207.93 a 612.25 a 1098.00 1614.00 9321.18
1894 1802.00 1445.00 941.00 511.50 221.00 18.50 2.50 13.00 159.50 514.00 1095.50 1195.00 7918.50
1895 1837.00 1517.50 1096.50 298.00 258.00 72.00 27.00 27.00 175.50 691.00 1101.50 1471.00 8572.00
1896 1500.00 1185.00 1300.00 516.00 176.50 65.00 33.00 42.50 265.50 622.67 b 1417.50 1290.00 8413.67
1897 1772.50 1415.00 1323.00 599.00 263.50 158.00 14.00 87.50 68.00 466.50 1066.50 1550.00 8783.50
1898 1333.50 1243.50 1003.00 556.50 285.00 37.00 14.00 10.50 138.50 634.50 1107.00 1620.00 7983.00
1899 1507.50 1633.00 1477.50 576.50 254.00 30.50 9.00 7.00 197.50 428.00 707.00 1436.00 8263.50
1900 1340.00 0.00 z 1138.00 424.00 168.50 48.00 25.83 a 0.50 211.00 292.50 1152.00 1339.00 6139.33
1901 1510.73 a 1426.00 1081.90 a 507.50 269.00 95.00 0.00 4.50 244.00 447.50 1022.50 1534.50 8143.13
1902 1488.50 1360.50 930.00 619.50 220.50 162.50 20.50 53.00 287.00 473.50 944.00 1654.00 8213.50
1903 1529.50 1455.50 1038.50 581.00 269.00 139.50 35.50 82.50 264.00 463.00 1068.00 1547.50 8473.50
1904 1768.00 1698.00 1071.50 700.00 269.00 99.50 58.90 a 56.00 226.50 481.50 809.50 1460.50 8698.90
1905 1830.00 1548.00 875.00 634.50 365.50 79.50 50.00 0.50 84.50 635.50 886.50 1274.50 8264.00
1906 1354.50 1284.00 1364.00 491.00 285.50 116.00 43.00 41.00 130.50 545.50 1089.50 1388.00 8132.50
1907 1796.45 a 1276.59 a 955.00 858.50 552.50 105.00 18.00 40.50 244.50 576.60 a 965.00 1263.80 c 8652.45
1908 1437.07 c 1405.50 1083.89 c 529.00 331.50 130.50 32.50 62.50 116.00 573.50 897.50 1380.00 7979.46
1909 1615.50 1337.50 1133.00 806.50 310.50 87.00 31.00 0.00 b 186.50 581.50 928.00 1446.00 f 7017.00
1910 1572.50 1516.00 550.50 458.00 336.98 d 106.55 a 10.73 e 45.00 174.00 349.00 0.00 z 1386.50 6505.76
1911 1679.50 1257.00 828.50 628.97 a 200.97 b 18.00 25.50 62.50 189.11 b 630.50 1234.50 1349.00 8104.04
1912 1988.50 1375.89 b 1310.50 478.97 a 258.50 133.50 27.00 24.50 291.00 462.00 827.50 1251.50 8429.35
1913 1485.50 1383.00 1166.50 529.00 342.50 55.50 7.75 a 0.00 186.50 0.00 z 0.00 z 0.00 z 5156.25
1914 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
1915 0.00 z 0.00 z 705.00 k 325.00 419.50 119.50 63.00 99.00 212.50 450.00 844.82 b 1350.50 3883.82
1916 1858.00 1567.00 1091.00 656.50 291.50 132.50 0.00 45.50 218.00 607.50 987.00 1697.00 9151.50
1917 1718.50 1596.00 1166.50 723.50 405.00 131.90 a 17.57 a 43.00 198.50 805.00 777.50 1762.00 9344.96
1918 1870.50 1302.00 797.22 a 692.50 200.50 48.00 19.50 18.08 a 298.00 449.00 870.54 b 1227.00 7792.84
1919 1288.16 c 1350.70 e 1070.50 623.50 307.33 b 68.79 a 2.21 c 12.92 a 117.86 b 705.00 1157.50 1611.00 8315.46
1920 1609.00 1339.00 1034.50 840.00 264.00 90.00 9.50 43.00 134.50 340.00 1020.54 b 1366.50 8090.54
1921 1327.83 d 1052.00 885.50 489.00 270.50 30.00 7.00 33.58 a 109.14 a 393.46 e 1162.76 a 1305.50 7066.27
1922 1571.18 a 1548.00 1002.50 544.82 b 189.62 a 19.14 a 30.00 12.40 a 110.00 433.00 841.07 b 1375.50 7677.23
1923 1365.55 a 1337.78 a 1211.50 588.00 257.50 69.23 d 0.00 z 47.53 a 0.00 z 376.50 g 724.44 c 0.00 z 5601.54
1924 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 38.00 28.62 e 193.50 i 210.50 846.72 a 1687.50 2811.34
1925 1675.50 1206.50 860.50 339.83 a 351.00 64.50 38.00 6.50 111.00 910.50 956.00 1449.50 7969.33
1926 1545.00 1113.26 a 1104.50 615.50 144.00 108.00 10.00 7.50 229.00 527.00 1139.00 1544.50 8087.26
1927 1483.00 1178.50 963.50 602.50 376.00 148.50 31.50 59.86 b 229.00 428.00 1136.50 1884.00 8520.86
1928 1577.50 1279.11 a 1062.00 882.50 265.00 261.00 48.50 49.60 a 177.50 487.00 921.50 1198.87 e 8210.07
1929 1868.00 1508.77 b 922.00 569.50 356.50 87.00 2.50 12.50 286.03 a 474.00 1128.00 e 1414.63 a 8629.44
1930 1827.45 a 930.00 972.50 452.50 263.50 66.50 12.00 7.00 148.50 541.50 841.00 1223.00 7285.45
1931 0.00 z 0.00 z 0.00 z 484.00 332.50 28.50 6.50 27.00 94.00 418.50 865.50 1216.00 3472.50
1932 1612.50 1308.50 1316.50 539.00 219.00 8.50 19.50 17.00 183.00 639.50 1093.50 1564.00 8520.50
1933 1265.50 1442.50 1037.50 618.50 317.00 20.00 15.00 18.50 86.00 560.00 961.50 1442.50 7784.50
1934 1366.50 1212.50 1110.50 577.00 89.00 28.45 a 6.50 65.00 308.50 389.00 851.00 1505.00 7508.95
1935 1629.00 1044.50 931.00 696.00 410.50 127.50 0.00 70.00 165.00 631.50 1187.00 1495.50 8387.50
1936 2027.50 2073.00 1084.00 759.00 157.50 85.50 0.00 6.00 104.50 587.00 1044.50 1361.50 9290.00
1937 1971.00 1424.37 a 1132.00 681.50 195.82 a 108.00 4.00 1.00 167.00 601.50 1047.00 1559.00 8892.19
1938 1664.50 1330.50 900.50 527.00 301.00 49.00 0.00 2.07 a 147.00 0.00 z 1011.50 1299.00 7232.07
1939 1347.50 1586.50 1041.50 608.00 95.00 38.50 0.00 17.50 154.00 515.50 824.50 1103.50 7332.00
1940 1853.00 1335.50 1215.50 642.50 278.50 44.00 3.50 42.00 104.50 274.50 1143.50 1292.50 8229.50
1941 1480.50 1374.50 1136.00 459.00 129.00 65.50 23.25 a 14.00 144.00 458.00 903.50 1188.50 7375.75
1942 1381.00 1224.00 943.00 383.50 359.00 56.79 b 12.50 16.50 294.00 494.00 936.50 1517.50 7618.29
1943 1793.00 1168.00 1209.00 535.50 371.00 78.50 3.50 15.50 241.50 479.00 1007.00 1268.00 8169.50
1944 1167.00 1294.50 1260.00 714.00 185.50 68.00 5.50 49.50 158.00 444.00 910.50 1382.50 7639.00
1945 1483.00 1198.50 815.00 663.00 406.50 168.50 24.50 16.00 241.00 464.50 1017.50 1668.50 8166.50
1946 1534.50 1253.50 722.50 398.00 339.50 87.50 2.50 49.50 242.50 548.50 1051.00 1341.00 7570.50
1947 1309.50 1422.00 1136.50 704.00 383.50 97.76 a 14.50 3.00 193.00 291.00 1151.50 1475.00 8181.26
1948 1671.50 1444.50 1166.50 440.50 279.50 55.50 8.50 36.00 86.50 492.00 966.50 1428.00 8075.50
1949 1660.50 1417.50 1095.00 558.50 170.00 33.50 4.50 14.00 237.50 469.00 750.50 1396.50 7807.00
1950 1856.00 1278.50 1241.50 851.50 388.00 86.00 27.00 60.00 151.50 407.00 1084.00 1531.50 8962.50
1951 1664.70 a 1192.50 1414.50 723.50 171.00 g 125.17 a 29.00 32.00 286.50 572.00 1131.50 1627.50 8798.87
1952 1658.00 1228.50 1278.50 532.00 271.50 26.50 6.50 5.50 156.00 621.00 932.50 1274.58 e 7991.08
1953 1498.00 1238.50 1043.67 a 743.00 293.50 50.00 10.00 5.00 174.00 334.00 842.50 1430.28 b 7662.44
1954 1753.57 a 907.50 1190.00 524.50 408.00 57.50 0.00 1.00 137.00 581.00 774.50 1304.00 7638.57
1955 1465.27 a 1452.00 1130.50 326.00 122.00 83.00 0.00 9.00 168.00 417.98 a 1233.50 1673.00 8080.25
1956 1662.50 1506.50 1183.00 737.50 228.00 13.00 8.50 28.00 175.00 281.50 974.50 1250.00 8048.00
1957 1737.00 1215.50 1066.92 a 588.00 301.50 55.00 0.00 25.00 219.50 532.50 964.50 1149.50 7854.92
1958 1294.00 1349.00 1045.00 566.00 170.50 94.50 f 14.50 22.50 120.50 419.50 929.00 1511.50 7442.00
1959 1677.00 1440.00 937.00 565.50 258.50 39.00 7.50 0.00 202.76 a 680.50 1257.00 1149.50 8214.26
1960 1637.00 1457.77 a 1471.00 577.00 265.10 b 51.00 11.00 5.00 t 196.50 486.50 884.50 1437.00 8474.37
1961 1623.00 1220.50 921.00 740.89 b 357.50 38.50 f 1.50 3.50 233.00 452.50 994.50 1536.50 8084.39
1962 1628.00 1350.00 1264.00 625.00 152.33 b 47.50 17.50 6.50 209.00 417.50 812.22 c 1313.37 a 7842.92
1963 1847.00 1293.50 845.50 476.00 242.00 11.00 0.00 21.50 91.00 220.50 832.50 1651.50 7532.00
1964 1338.00 1141.00 1219.00 524.48 a 112.50 j 48.50 0.00 66.00 206.00 505.50 965.00 1590.00 7603.48
1965 1713.50 1468.50 1413.50 604.50 172.50 19.00 2.50 35.50 381.50 414.00 970.00 1164.00 8359.00
1966 1828.00 1376.50 863.00 724.00 324.50 58.50 0.00 46.50 189.00 560.00 1073.00 1451.50 8494.50
1967 1465.50 1501.00 968.23 a 618.00 439.50 62.00 45.00 53.50 188.50 615.00 1028.50 1395.00 8379.73
1968 1638.50 1449.50 876.50 582.41 a 418.00 82.00 28.50 51.00 228.00 543.50 980.00 1533.98 a 8411.90
1969 1820.00 1358.50 1486.50 595.71 b 248.00 190.00 10.50 11.50 169.50 680.00 987.00 1417.50 8974.71
1970 1975.00 1377.50 1255.50 667.00 266.00 64.00 21.50 17.50 243.50 608.50 1061.00 1576.00 9133.00
1971 1804.50 1393.50 1144.50 552.50 344.00 25.00 48.50 44.00 238.50 464.50 1010.00 1555.50 8625.00
1972 1834.00 1619.50 1156.00 727.00 248.50 60.50 37.00 65.00 252.00 685.50 1026.00 1612.00 9323.00
1973 1505.00 1265.70 a 846.00 631.50 337.00 54.50 12.50 5.50 228.00 416.50 967.50 1573.00 7842.70
1974 1763.00 1325.50 1058.00 580.50 356.00 101.00 5.50 54.50 297.00 518.50 963.00 1355.00 8377.50
1975 1565.50 1486.00 1382.00 807.50 212.50 88.50 13.50 10.00 290.50 474.50 928.97 a 1476.00 8735.46
1976 1671.00 1118.00 1069.00 462.50 324.50 42.00 3.50 15.50 206.00 730.00 1169.50 1613.50 8425.00
1977 1988.50 1193.00 989.93 a 0.00 z 66.50 25.50 7.50 67.68 a 165.50 597.50 1065.50 1592.50 7759.62
1978 2045.00 1635.00 1166.50 625.50 254.00 91.50 24.00 25.50 125.56 c 581.50 1087.24 a 1614.50 9275.80
1979 2060.00 1713.19 a 1252.00 722.50 414.50 73.00 7.50 53.00 160.50 592.00 1048.50 1248.00 9344.69
1980 1522.00 1447.41 a 1184.50 535.50 244.90 a 32.00 9.00 15.00 182.50 622.00 884.50 1385.70 a 8065.01
1981 1433.50 1161.50 889.00 425.00 317.00 37.50 17.00 28.50 160.50 598.00 853.50 1533.50 7454.50
1982 1996.50 1446.00 1096.50 698.50 197.00 129.50 2.00 45.00 214.00 552.50 1100.50 1302.00 8780.00
1983 1500.00 1172.50 1058.00 735.00 353.50 106.50 0.52 a 0.00 225.50 566.50 961.50 2019.50 8699.02
1984 1591.00 1139.50 1324.00 616.00 343.50 29.00 13.50 22.50 334.00 534.50 956.00 1503.50 8407.00
1985 1781.50 1435.50 941.50 488.00 188.50 148.50 17.00 89.50 294.00 653.00 1362.00 1806.00 9205.00
1986 1500.00 1464.00 1011.50 571.50 263.50 39.00 7.50 93.50 223.50 557.50 1146.00 1264.00 8141.50
1987 1379.00 941.00 955.50 451.00 167.00 40.00 13.50 85.00 180.50 711.00 819.50 1291.50 7034.50
1988 1876.50 1598.50 985.50 630.50 119.00 6.00 4.00 49.00 200.00 701.50 972.50 1395.52 a 8538.52
1989 1348.00 1637.00 1243.50 609.00 279.00 86.00 4.00 22.50 230.50 534.00 1114.00 1702.50 8810.00
1990 1227.00 1252.00 965.50 643.00 345.00 67.00 38.00 35.50 162.00 621.00 938.50 1585.00 7879.50
1991 1717.00 1080.00 965.00 516.50 251.50 18.50 22.00 18.50 230.00 631.50 1264.50 1331.50 8046.50
1992 1291.50 1113.00 949.50 757.50 232.50 87.50 94.50 125.50 238.00 595.00 1087.00 1526.00 8097.50
1993 1705.50 1512.50 1266.00 703.50 317.50 128.00 6.00 30.50 326.00 625.00 1121.50 1452.50 9194.50
1994 1938.02 a 1612.00 983.00 635.50 210.50 24.00 23.50 58.50 167.50 484.00 917.00 1394.00 8447.52
1995 1573.00 1264.00 1071.50 790.00 375.50 81.50 22.00 14.00 268.50 612.00 1191.50 1387.00 8650.50
1996 1803.50 1381.00 1310.00 745.50 413.00 57.50 0.00 z 8.50 265.00 560.00 1305.50 1738.00 9587.50
1997 1889.50 1368.00 1196.50 750.50 433.50 9.50 27.50 47.00 157.50 516.00 1153.00 1244.50 8793.00
1998 1493.50 968.00 1197.00 582.50 152.50 120.00 6.50 1.50 87.00 488.50 935.50 1272.50 7305.00
1999 1694.50 1058.50 1014.50 587.50 244.00 99.00 6.00 13.00 235.50 583.50 733.50 1287.50 7557.00
2000 1522.00 1100.50 842.00 653.50 236.00 105.00 36.00 16.00 218.50 471.00 1205.00 1842.00 8247.50
2001 1500.50 1597.00 1294.00 602.50 234.50 82.50 9.00 17.00 201.50 0.00 z 671.00 1302.50 7512.00
2002 1382.50 1096.50 1422.00 651.50 423.50 43.50 6.50 38.00 184.50 791.00 1017.00 1296.00 8352.50
2003 1558.00 1426.50 1129.50 584.00 338.50 90.00 4.00 15.50 259.50 505.50 1098.00 1315.00 8324.00
2004 1648.50 1394.50 911.00 570.00 347.00 134.00 35.50 114.00 124.00 517.00 871.50 1311.50 7978.50
2005 1634.00 1130.50 1099.00 479.50 337.50 18.50 17.50 28.50 109.50 514.50 900.50 1561.00 7830.50
2006 1176.50 1300.50 1079.00 508.50 288.00 39.00 6.00 18.00 319.50 648.00 991.00 1265.00 7639.00
2007 1506.00 1535.00 952.00 727.00 161.50 41.50 6.50 22.00 199.50 438.50 969.50 1630.50 8189.50
2008 1752.50 1579.50 1211.50 764.00 371.00 44.00 10.00 17.00 198.50 561.50 989.00 1711.50 9210.00
2009 1775.00 1298.00 1121.00 690.00 0.00 z 146.50 43.00 69.00 121.00 790.00 777.50 1611.00 8442.00
2010 1773.00 1491.50 945.50 420.50 345.50 53.00 0.50 9.00 226.50 468.00 991.50 1628.50 8353.00
2011 1788.50 1454.00 1256.50 692.00 330.50 90.50 0.00 11.50 252.50 480.00 948.00 1241.55 a 8545.55
2012 1384.00 1204.50 641.00 486.50 197.00 39.00 0.00 62.00 252.00 728.00 1011.00 1480.00 7485.00
2013 1600.50 1393.00 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 2993.50
Period of Record Statistics
MEAN 1624.26 1351.40 1086.29 600.81 281.02 73.09 16.14 32.21 197.58 531.05 997.71 1446.83 8255.70
S.D. 206.25 185.02 175.95 119.48 88.38 44.73 16.12 26.66 62.84 120.56 140.58 174.48 545.68
SKEW -0.03 0.23 -0.05 -0.07 -0.01 0.99 1.67 1.04 0.19 0.02 0.23 0.47 0.12
MAX 2060.00 2073.00 1486.50 882.50 552.50 261.00 94.50 125.50 381.50 910.50 1417.50 2019.50 9344.96
MIN 1167.00 907.50 550.50 298.00 66.50 6.00 0.00 0.00 68.00 210.50 671.00 1103.50 7034.50
NO YRS 117 116 116 117 115 116 117 118 117 115 117 116 101