GANN VALLEY 4 NW, SOUTH DAKOTA

Monthly Total Heating Degree Days

(393217)

Base Temperature = 65 F

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 200905
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
1897 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 59.40 e 484.00 1112.00 1493.00 3148.40
1898 1285.00 1136.00 1077.00 555.00 306.00 42.00 13.00 6.00 146.00 479.00 h 481.50 o 1395.50 5961.50
1899 1504.00 1601.00 139.00 z 0.00 z 173.50 h 29.00 4.00 6.00 184.00 437.00 720.00 1510.00 5995.00
1900 0.00 z 0.00 z 0.00 z 0.00 z 123.00 16.00 j 7.50 0.00 d 155.00 i 303.28 a 1119.83 a 1236.50 2790.11
1901 1383.00 1402.07 a 0.00 z 0.00 z 43.50 o 42.00 0.00 1.00 177.60 e 378.89 d 709.00 f 1418.77 a 4803.33
1902 1359.50 1304.15 b 917.50 553.00 124.57 d 99.00 1.00 22.50 176.00 426.50 888.00 1599.00 7470.73
1903 909.50 l 1510.50 1046.50 479.00 166.50 57.93 a 8.27 a 18.17 b 53.00 n 377.50 1025.00 1496.50 6185.87
1904 1650.75 a 1584.00 1013.70 a 629.50 240.50 70.50 12.50 6.50 110.00 391.00 828.00 1522.50 8059.45
1905 1713.50 1507.00 798.00 564.00 353.50 88.00 8.50 0.00 71.50 593.00 797.50 1260.50 7755.00
1906 1386.50 1192.00 1314.50 414.00 245.00 68.50 14.00 0.00 z 117.00 0.00 z 0.00 z 1347.47 a 6098.97
1907 1843.50 1219.56 a 806.52 a 759.83 a 469.43 c 94.62 d 6.50 15.50 a 191.00 445.50 856.73 d 0.00 z 6708.67
1908 0.00 z 1229.50 991.50 467.00 353.50 0.00 z 0.00 40.54 e 71.90 a 520.50 857.00 1361.33 b 5892.76
1909 1531.40 a 1289.08 b 1037.98 a 727.00 266.50 37.00 9.00 2.00 117.00 495.00 904.50 1725.00 8141.46
1910 1608.50 1506.81 a 532.50 391.50 336.50 85.50 0.00 16.00 124.00 307.00 0.00 z 1416.18 a 6324.50
1911 1585.00 1268.50 767.50 521.90 a 163.78 a 1.50 5.00 44.00 117.50 562.13 a 1153.00 1294.25 c 7484.06
1912 1803.54 c 760.00 h 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 1803.54
1913 978.50 j 0.00 z 0.00 z 0.00 z 114.50 s 93.75 b 5.00 0.00 159.00 596.00 697.50 1223.31 e 2774.56
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 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
1916 0.00 z 0.00 z 0.00 z 552.86 b 287.00 105.50 0.00 30.50 138.00 511.00 949.50 1650.23 a 4224.59
1917 1633.00 1564.50 1175.50 689.00 354.50 100.00 9.00 28.00 145.00 748.00 676.00 1637.00 8759.50
1918 1809.00 1285.50 734.50 639.44 c 195.00 42.32 b 13.00 6.72 a 264.50 407.00 875.00 1184.00 7455.98
1919 1215.50 1363.50 1124.50 580.50 233.00 85.00 0.00 5.68 a 136.00 710.00 1231.00 1547.00 8231.68
1920 1458.00 1201.50 693.00 k 789.50 182.00 64.00 0.50 27.50 116.50 i 350.50 1046.50 1315.00 6435.00
1921 1252.00 1019.50 858.00 503.28 a 240.50 20.00 7.00 32.50 167.50 457.50 1059.44 c 1331.00 6948.22
1922 1636.50 1580.78 e 1062.50 525.50 196.50 22.50 18.50 1.50 68.28 a 449.50 876.00 1485.50 7923.56
1923 1288.50 1335.50 0.00 z 601.11 c 238.50 76.50 0.00 15.50 f 100.50 521.00 614.50 g 1165.50 5327.11
1924 1733.50 1141.00 1094.00 546.50 394.50 92.50 2.00 7.50 131.00 211.00 842.50 1584.50 7780.50
1925 1539.50 1057.50 788.50 249.00 276.50 21.00 4.00 0.00 59.48 a 800.50 692.00 h 1321.12 a 6117.10
1926 1438.50 996.59 a 941.50 512.68 b 112.50 41.50 0.00 0.50 157.00 391.50 1075.50 1362.00 7029.77
1927 1358.00 1014.00 835.50 530.50 280.50 51.50 5.00 4.00 172.50 305.00 1054.14 a 1768.00 7378.64
1928 1350.00 1073.50 804.50 645.52 a 105.00 53.50 0.00 7.50 132.41 a 428.00 882.32 b 1122.00 6604.25
1929 1837.00 1527.56 a 819.00 477.50 267.00 57.50 0.00 0.50 237.00 395.00 1067.50 1322.00 8007.56
1930 1737.50 841.00 952.00 379.50 302.25 a 25.00 f 0.00 0.00 100.00 535.50 845.00 1148.03 a 6840.78
1931 1091.00 814.50 970.30 a 440.50 279.00 8.00 2.50 8.00 56.50 321.00 834.00 1259.00 6084.30
1932 1525.72 a 1205.50 1176.00 404.50 145.50 0.50 1.00 0.00 69.00 572.98 a 891.50 1446.67 a 7438.87
1933 1114.50 1249.00 867.00 509.50 241.00 0.00 0.00 1.50 18.10 a 404.00 834.00 1298.00 6536.60
1934 1210.00 1020.96 a 922.00 455.50 53.50 0.50 0.00 16.50 191.50 304.00 698.50 1268.00 6140.96
1935 1442.00 864.50 789.00 639.00 356.00 77.50 0.00 28.50 68.50 449.50 960.00 1291.50 6966.00
1936 1843.50 1912.50 934.50 630.00 112.50 40.50 0.00 0.00 68.50 454.00 948.00 1272.50 8216.50
1937 1851.00 1328.50 918.00 577.50 126.00 70.00 0.00 0.00 98.00 462.50 989.00 1424.50 7845.00
1938 1444.00 1244.00 831.00 441.00 310.50 61.50 0.00 0.00 82.50 289.00 947.07 a 1197.50 6848.07
1939 1146.50 1461.00 939.50 534.50 110.50 20.50 0.00 5.50 110.69 a 384.00 658.00 952.00 6322.69
1940 1837.00 1207.50 1088.50 639.50 263.00 27.50 0.00 e 1.00 114.50 209.50 1017.50 1164.00 7569.50
1941 1407.00 1243.50 1105.27 e 544.00 99.50 70.00 12.92 a 1.50 84.50 428.00 795.00 1055.00 6846.19
1942 0.00 z 1316.50 918.50 346.00 495.50 65.00 10.50 9.00 263.50 472.50 886.00 1405.50 6188.50
1943 1725.00 1071.50 1170.00 398.00 325.00 85.50 0.00 11.00 151.00 398.50 944.50 1225.00 7505.00
1944 1208.50 1366.50 1243.50 663.50 166.00 86.00 7.00 25.50 141.50 424.00 915.00 1346.00 7593.00
1945 1326.50 1117.50 767.00 636.00 394.00 201.50 19.00 7.00 228.00 448.50 962.00 1581.00 7688.00
1946 1343.00 1151.00 715.50 355.00 350.00 93.50 0.50 42.00 184.00 589.50 977.50 1256.00 7057.50
1947 1271.50 1363.00 1100.00 668.50 373.50 118.00 11.00 0.00 152.00 214.50 1142.00 1422.50 7836.50
1948 1564.00 1484.00 1172.00 393.00 228.00 53.50 0.00 a 19.50 54.00 365.00 870.50 1318.00 7521.50
1949 1780.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 113.00 n 481.50 691.50 1398.00 4351.50
1950 1854.00 1330.00 1296.50 798.50 360.50 66.00 10.00 36.00 189.50 408.50 1039.50 1410.50 8799.50
1951 1593.50 1096.50 1368.50 676.50 244.00 143.00 35.13 a 24.91 c 261.00 563.00 1086.21 a 1654.00 8746.25
1952 1694.00 1205.50 1302.00 420.50 k 249.55 a 12.50 4.00 5.00 109.50 568.00 943.50 1314.00 7407.55
1953 1339.00 1204.50 977.00 712.50 300.00 44.50 5.00 4.00 115.00 310.50 806.00 1315.00 7133.00
1954 1660.50 753.00 1099.98 a 492.00 363.00 74.50 0.50 0.00 114.50 577.00 747.50 1319.50 7201.98
1955 1427.00 1433.50 1086.00 322.00 127.50 94.50 0.00 a 2.50 154.00 440.00 1262.00 1682.02 b 8031.02
1956 1677.50 1550.50 1140.50 722.00 233.50 10.86 a 2.00 26.00 151.00 292.36 b 939.00 1180.50 7925.72
1957 1737.00 1176.50 1076.22 a 627.50 311.50 60.00 0.00 b 13.50 175.00 509.90 b 912.50 1063.00 7662.61
1958 1247.00 1363.60 c 1166.50 562.50 151.00 116.90 a 10.85 a 9.00 80.69 a 413.00 883.50 1429.50 7434.04
1959 1631.50 1424.00 849.00 542.50 267.00 25.50 5.00 0.50 201.00 638.50 1163.00 1094.50 7842.00
1960 1582.50 1492.00 1470.00 568.50 291.29 b 69.50 6.50 5.50 175.00 432.50 910.50 1483.00 8486.79
1961 1612.00 a 1158.50 875.50 743.28 a 329.50 46.50 2.50 0.00 262.50 444.33 a 592.50 l 1516.50 6991.11
1962 1579.00 1352.50 1325.00 557.00 173.00 63.50 26.00 22.50 203.00 447.36 b 805.00 1302.55 c 7856.42
1963 1788.50 1159.50 801.50 555.54 b 232.00 10.50 0.00 a 13.00 70.18 b 200.00 856.55 a 1541.50 7228.77
1964 1322.50 1094.50 1182.00 483.50 167.00 55.50 0.00 57.00 179.48 a 448.50 1001.50 1599.50 7590.98
1965 1666.00 1294.50 1362.50 527.50 201.50 21.50 0.00 c 17.50 401.00 368.00 930.00 1139.50 7929.50
1966 1826.00 1403.50 871.00 710.00 305.00 66.00 0.00 38.50 184.00 517.00 1030.50 1344.00 8295.50
1967 1398.00 1322.50 918.50 538.50 418.00 51.00 33.50 21.00 104.00 477.50 959.00 1386.00 7627.50
1968 1536.50 1285.50 797.50 570.00 375.21 b 59.46 b 13.50 21.50 155.50 450.50 925.00 1517.97 a 7708.14
1969 1770.00 1257.50 1406.50 425.50 189.10 a 102.50 0.00 b 0.00 a 90.00 669.50 917.50 1339.00 8167.10
1970 1771.00 1109.00 1186.00 611.50 173.50 25.00 5.50 0.00 168.00 519.50 1002.00 1512.50 8083.50
1971 1719.50 1281.50 1011.50 488.00 277.00 14.00 22.50 2.00 169.00 432.50 929.00 1496.50 7843.00
1972 1729.50 1471.00 1005.50 585.00 234.00 35.00 16.50 27.50 128.00 575.50 1043.50 1540.50 8391.50
1973 1436.00 1142.50 766.50 558.00 251.50 19.00 0.00 0.00 163.00 341.00 1017.00 1477.50 7172.00
1974 1512.50 1118.50 897.00 475.50 276.50 65.50 0.00 31.00 198.50 361.00 915.00 1239.50 7090.50
1975 1423.50 1385.50 1168.50 697.50 180.50 54.00 4.00 1.00 178.50 408.00 939.50 1295.00 7735.50
1976 1483.50 938.00 934.00 396.50 194.00 18.50 0.00 0.00 125.00 602.50 1109.00 1416.00 7217.00
1977 1786.00 1021.00 895.00 354.50 57.50 0.50 0.00 9.50 109.50 493.00 1009.00 1497.00 7232.50
1978 1978.00 1587.00 1035.00 558.50 219.50 50.50 2.50 14.00 63.50 415.00 1032.00 1501.00 8456.50
1979 1915.50 1594.50 1025.50 613.00 325.00 42.00 1.50 20.00 52.50 447.00 1023.50 1057.00 8117.00
1980 1463.50 1306.50 1015.50 443.50 161.00 12.00 0.00 8.00 79.50 517.50 804.50 1287.50 7099.00
1981 1227.00 1057.00 788.50 316.50 253.50 21.50 7.00 1.50 69.00 484.00 732.00 1413.00 6370.50
1982 1892.50 1254.00 1024.00 625.50 165.00 83.00 0.00 19.50 176.00 508.50 1049.00 1230.00 8027.00
1983 1230.50 949.00 996.00 721.00 348.50 91.00 6.00 0.00 155.50 443.50 964.50 1947.00 7852.50
1984 1420.50 976.00 1111.50 575.00 279.50 32.00 4.00 0.00 250.00 487.50 890.50 1478.50 7505.00
1985 1627.00 1335.00 896.00 397.50 106.50 109.00 5.50 40.00 261.00 493.00 1353.00 1663.00 8286.50
1986 1317.00 1333.50 758.00 547.50 186.50 9.00 0.00 30.50 175.50 493.00 1081.50 1160.00 7092.00
1987 1283.40 a 907.00 967.00 425.50 130.00 25.00 7.00 68.50 116.00 625.00 839.50 1244.50 6638.40
1988 1761.00 1445.00 945.00 583.00 168.50 3.50 11.00 12.00 141.50 576.50 900.00 1316.50 7863.50
1989 1345.50 1595.00 1216.00 531.50 238.50 78.50 6.00 6.50 180.00 463.50 996.00 1664.50 8321.50
1990 1138.00 1123.50 889.50 604.50 293.50 46.50 15.50 8.50 123.00 534.00 831.00 1608.50 7216.00
1991 1664.00 1009.00 973.00 527.50 253.50 12.50 4.50 2.00 217.00 632.50 1201.50 1240.00 7737.00
1992 1220.50 1042.50 896.50 715.00 267.00 94.00 84.50 104.00 211.50 574.50 1091.00 1452.50 7753.50
1993 1643.00 1471.00 1071.00 684.50 339.50 143.50 31.50 46.00 349.50 633.00 1145.50 1361.50 8919.50
1994 1836.50 1572.00 951.00 642.50 236.50 45.00 29.00 41.00 169.50 482.50 955.00 1372.78 a 8333.28
1995 1550.50 1139.50 1111.50 842.50 414.50 86.50 17.50 11.50 239.00 607.00 1128.50 1368.00 8516.50
1996 1750.00 1322.50 1339.00 730.00 385.50 58.50 17.00 1.00 230.00 570.00 1288.00 1765.00 9456.50
1997 1803.50 1283.50 1081.50 758.50 383.00 25.50 28.50 22.50 139.00 496.00 1061.50 1169.00 8252.00
1998 1484.50 936.50 1210.50 546.50 174.50 140.50 2.50 0.00 68.50 511.00 881.00 1261.00 7217.00
1999 1556.72 a 938.00 916.00 599.50 269.50 77.07 a 10.16 b 11.50 248.79 a 578.50 705.50 1173.50 7084.73
2000 1399.00 1049.00 800.50 604.50 221.50 102.50 14.50 6.50 158.00 460.50 1266.00 1763.00 7845.50
2001 1455.50 1549.00 1259.00 628.39 b 219.00 84.00 12.00 8.00 153.00 556.00 716.50 1288.00 7928.39
2002 1312.00 1006.00 1346.50 595.00 416.00 28.00 3.50 26.50 172.50 772.00 955.00 1217.50 7850.50
2003 1479.50 1324.50 1034.50 509.50 302.50 86.50 0.00 14.00 180.50 402.00 1114.00 1196.50 7644.00
2004 1568.00 1289.50 828.50 515.00 277.50 118.50 22.50 71.00 126.50 513.50 845.00 1239.00 7414.50
2005 1570.50 1046.50 1024.00 496.50 352.50 41.00 4.28 b 10.50 65.50 m 494.00 858.50 1506.00 7404.28
2006 1006.00 1171.00 1002.50 436.50 269.00 27.00 0.00 5.50 261.00 621.50 931.50 1193.50 6925.00
2007 1470.50 1455.00 749.00 654.00 149.50 32.50 3.00 0.00 z 156.50 453.00 884.00 1451.00 7458.00
2008 1515.50 1365.00 1019.00 709.00 364.50 54.50 8.50 1.00 138.00 521.00 914.50 1602.00 8212.50
2009 1557.00 1146.00 1107.50 652.00 251.50 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 0.00 z 4714.00
Period of Record Statistics
MEAN 1531.90 1253.12 1007.38 559.72 253.33 57.78 7.29 14.50 150.43 471.83 950.22 1380.75 7648.44
S.D. 217.15 210.80 180.24 117.86 92.18 37.46 11.15 17.79 65.30 114.23 142.17 180.59 636.30
SKEW -0.14 0.10 0.30 -0.10 0.11 0.72 3.69 2.11 0.81 0.14 0.32 0.39 -0.09
MAX 1978.00 1912.50 1470.00 842.50 495.50 201.50 84.50 104.00 401.00 800.50 1353.00 1947.00 9456.50
MIN 1006.00 753.00 532.50 249.00 53.50 0.00 0.00 0.00 18.10 200.00 658.00 952.00 6084.30
NO YRS 104 105 101 103 105 104 107 104 104 107 102 108 87