Results
| Country: | U.S.A.
| | Station: | ALTON, IL | | River: | MISSISSIPPI RIVER | | Area: | 444158.67 | | Lat: | 38.88 | | Lon: | -90.18 | | Source: | USGS | | PointID: | 5587500 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1933 | | Ending Year: | 1987 | | Total Years: | 55 | | Total Usable Years: | 52 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1933 | -9999 | -9999 | -9999 | 5376.45 | 5529.12 | 3545.76 | 1978.26 | 1165.47 | 860.36 | 970.63 | 886.89 | 781.82 | -9999 |
| 1934 | 844.67 | 916.16 | 1086.46 | 1978.51 | 1321.86 | 898.22 | 1083.35 | 853.62 | 1017.81 | 1362.14 | 1633.04 | 2510.07 | 1292.16 |
| 1935 | 1940.72 | 2247.36 | 4201.97 | 4493.91 | 5176.53 | 4596.79 | 4443.94 | 2197.31 | 1367.9 | 1086.19 | 1866.18 | 1282.21 | 2908.42 |
| 1936 | 1134.6 | 1378.26 | 4924.42 | 4391.02 | 3683.95 | 1936.88 | 857.46 | 632.47 | 1519.77 | 1694.09 | 1528.17 | 958.03 | 2053.26 |
| 1937 | 2178.22 | 2627.82 | 4898.84 | 3566.05 | 4489.61 | 3311.96 | 2007.77 | 1212.33 | 911.24 | 892.53 | 963.16 | 831.97 | 2324.29 |
| 1938 | 1203.38 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1939 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | 788.03 | 860.08 | 945.33 | -9999 |
| 1940 | 678.51 | 728.82 | 1457.41 | 2443.95 | 1846.45 | 2141.71 | 1398.04 | 1578.17 | 1189.22 | 881.75 | 1167.04 | 1472.12 | 1415.27 |
| 1941 | 1533.59 | 1555.11 | 2140.31 | 4437.93 | 2935.74 | 3311.39 | 1696.46 | 822.2 | 2834.25 | 5273.63 | 5027.78 | 2616.67 | 2848.75 |
| 1942 | 1803.7 | 3966.81 | 3839.88 | 4419.72 | 3739.85 | 5441.58 | 3965.48 | 2513.36 | 2652.55 | 2676.5 | 2910.04 | 2507.33 | 3369.73 |
| 1943 | 2926.97 | 3435.56 | 3831.47 | 5283.95 | 7457.42 | 7404.9 | 4970.64 | 3095.05 | 1723.75 | 1256.45 | 1494.01 | 1298.56 | 3681.56 |
| 1944 | 1213.16 | 1486.64 | 4174.02 | 6350.56 | 7687.61 | 6700.75 | 4198.95 | 1700.57 | 1412.07 | 1305.23 | 1298.05 | 1105.46 | 3219.42 |
| 1945 | 1067.46 | 1687.69 | 4317.98 | 7257.65 | 5777.58 | 6930.11 | 3157.8 | 2100.76 | 2024.1 | 2092.08 | 1747.06 | 1680.93 | 3320.1 |
| 1946 | 4854.45 | 2586.45 | 5598 | 4652.86 | 2925.42 | 3970.23 | 3354.1 | 1762.87 | 1628.13 | 1735.65 | 3428.43 | 1694 | 3182.55 |
| 1947 | 1837.23 | 1771.94 | 2525.6 | 7021.67 | 5857.05 | 8984.98 | 5726.98 | 1315 | 1255.48 | 1005.44 | 1324.39 | 1629.6 | 3354.61 |
| 1948 | 1357.48 | 1471.21 | 6555.66 | 5492.55 | 3558.53 | 1479.56 | 2107.52 | 1153.23 | 835.54 | 711.67 | 929.55 | 955.29 | 2217.32 |
| 1949 | 2184.7 | 3305.5 | 4633.57 | 4388.19 | 2157.21 | 1987.57 | 2154.1 | 1323.32 | 933.99 | 1189.22 | 918.7 | 1557.89 | 2227.83 |
| 1950 | 3134.6 | 2879.13 | 4320.44 | 5602.05 | 6135.66 | 4764.81 | 2722.09 | 1537.52 | 1189.13 | 989.27 | 832.43 | 1041.7 | 2929.07 |
| 1951 | 1227.77 | 2856.27 | 4421.01 | 7880.62 | 7618.19 | 4480.69 | 6939.49 | 3109.94 | 2676.24 | 2733.96 | 3282.22 | 2222.15 | 4120.71 |
| 1952 | 2866.69 | 3007.07 | 5117.89 | 7049.99 | 6419.74 | 3469.4 | 3412.93 | 2987.81 | 1495.14 | 938.57 | 1143.91 | 1284.95 | 3266.17 |
| 1953 | 1243.85 | 2169.39 | 3366.16 | 4719.5 | 3441.61 | 3254.09 | 3231.43 | 2894 | 1310.04 | 876.37 | 968.91 | 1187.85 | 2388.6 |
| 1954 | 1075.41 | 988.16 | 1568.49 | 2957.99 | 4432.34 | 3898.31 | 3426.63 | 1673.9 | 1666.74 | 3276.82 | 1843.81 | 1496.87 | 2358.79 |
| 1955 | 2237.41 | 2200.23 | 3272.35 | 3961.36 | 2906.42 | 2884.09 | 1911.12 | 1392.01 | 926.25 | 1242.39 | 1028 | 1050.74 | 2084.36 |
| 1956 | 920.49 | 1067.84 | 1533.32 | 3264.67 | 2846.59 | 1948.49 | 1793.11 | 1714.55 | 1012.62 | 643.44 | 991.76 | 1004.16 | 1561.75 |
| 1957 | 1056.5 | 1327.16 | 1640.01 | 3283.26 | 3621.84 | 3693.48 | 3695.83 | 1803.7 | 1410.09 | 1176.16 | 1477.96 | 1647.5 | 2152.79 |
| 1958 | 1388.9 | 1268.1 | 2319.71 | 2281.78 | 1596.26 | 2831.23 | 3751 | 2286.28 | 1184.69 | 840.19 | 1189.13 | 842.11 | 1814.95 |
| 1959 | 823.02 | 2594.54 | 4127.89 | 4458.98 | 3284.5 | 2547.02 | 1992.33 | 1520.62 | 1680.71 | 2992.19 | 2236.95 | 1875.5 | 2511.19 |
| 1960 | 3429.65 | 2487.01 | 2117.65 | 8544.18 | 7186.12 | 5421.76 | 3497.24 | 1608.04 | 1709.5 | 1254.17 | 1732.06 | 1239.55 | 3352.24 |
| 1961 | 1014.94 | 1424.45 | 4085.96 | 4841.26 | 4253.94 | 2170.5 | 1846.82 | 1800.6 | 2854.35 | 2617.95 | 4648.71 | 2255.04 | 2817.88 |
| 1962 | 1911.31 | 3098.18 | 5179.36 | 7931.59 | 4810.24 | 4350.25 | 3078.24 | 1867.37 | 2291.13 | 1815.48 | 1347.23 | 1154.51 | 3236.24 |
| 1963 | 979.68 | 934.56 | 3772.46 | 3003.49 | 3169.04 | 2021.08 | 1538.71 | 1274.45 | 845.07 | 785.29 | 852.81 | 748.57 | 1660.43 |
| 1964 | 791.69 | 907.41 | 1456.32 | 3090.99 | 3366.07 | 1952.65 | 1215.9 | 777.62 | 1479.56 | 935.83 | 1062.93 | 995.48 | 1502.7 |
| 1965 | 1951.95 | 2171.71 | 4166.98 | 8419.59 | 8079.48 | 4457.95 | 2314.23 | 1403.06 | 4288.42 | 3996.72 | 2105.46 | 2896.19 | 3854.31 |
| 1966 | 2594.29 | 3423.22 | 3878.52 | 5165.96 | 5324.51 | 4029.42 | 1916.88 | 1350.45 | 1079.26 | 994.93 | 1053.49 | 1491.12 | 2691.84 |
| 1967 | 1250.33 | 1846.17 | 2511.35 | 6282.6 | 3576.89 | 4186.76 | 3328.16 | 1315.37 | 1057.07 | 1352.36 | 2260.83 | 2395.34 | 2613.6 |
| 1968 | 1439.23 | 2485.74 | 1655.54 | 2413.55 | 3002.79 | 3434.38 | 4316.06 | 2498.11 | 1804.64 | 2516.83 | 2801.4 | 1922.82 | 2524.26 |
| 1969 | 2960.77 | 3715.6 | 3694.73 | 7246.32 | 6482.77 | 4048.39 | 7461.07 | 2665.54 | 1480.13 | 2828.69 | 1610.48 | 1215.44 | 3784.16 |
| 1970 | 1310.53 | 1665.24 | 2707.1 | 4446.71 | 6555.84 | 5702.1 | 1978.08 | 2678.79 | 4004.4 | 3260.38 | 3523.39 | 2630.19 | 3371.9 |
| 1971 | 1753.46 | 3053.08 | 5638.74 | 5341.53 | 3552.23 | 3043.23 | 2355.7 | 1302.67 | 1024.79 | 1248.32 | 2160.59 | 2718.89 | 2766.1 |
| 1972 | 1765.06 | 1418.58 | 3641.93 | 5259.41 | 5906.38 | 3318.66 | 2696.97 | 4255.77 | 3507.06 | 4071.62 | 4995.12 | 2751.77 | 3632.36 |
| 1973 | 4979.22 | 4750.18 | 7831.02 | 11105.9 | 10982.4 | 7453.03 | 3647.14 | 2656.68 | 2215.43 | 4000.01 | 2671.43 | 3281.03 | 5464.46 |
| 1974 | 4024.03 | 4998.96 | 5601.29 | 5681.33 | 6923.96 | 8901.92 | 4991.28 | 2153.46 | 1405.56 | 1131.4 | 2013.24 | 1778.67 | 4133.76 |
| 1975 | 2244.81 | 2789.22 | 4427.59 | 6157.06 | 7540.54 | 4505.23 | 3735.56 | 1507.01 | 1825.41 | 1147.11 | 1535.06 | 2281.89 | 3308.04 |
| 1976 | 1303.59 | 2387.22 | 5280.66 | 5771.95 | 4950.54 | 1984.27 | 1332.82 | 788.86 | 604.76 | 626.45 | 652.42 | 669.47 | 2196.08 |
| 1977 | 677.6 | 1054.1 | 2010.23 | 2070.35 | 2043.48 | 986.85 | 1096.32 | 1625.94 | 2858.7 | 3631.88 | 3101.94 | 2282.17 | 1953.3 |
| 1978 | 1949.95 | 1307.03 | 3941.27 | 6956.54 | 5953.88 | 3630.24 | 5440.52 | 2324.28 | 2786.58 | 1902.26 | 1602.84 | 1473.76 | 3272.43 |
| 1979 | 1136.24 | 1515.77 | 6742.55 | 10791.6 | 8190.92 | 3992.7 | 3123 | 3389.18 | 2887.11 | 1439.33 | 2317.75 | 1913.5 | 3953.3 |
| 1980 | 1742.14 | 1671.68 | 2968.35 | 4342.88 | 2088.24 | 4707.98 | 1646.59 | 2493.45 | 3852.06 | 2463.03 | 1657.96 | 1702.77 | 2611.43 |
| 1981 | 1204.75 | 1815.42 | 2320.17 | 3672.05 | 4884.23 | 4095.87 | 5876.23 | 4123.32 | 2994.52 | -9999 | -9999 | -9999 | -9999 |
| 1982 | 1587.03 | 3864.87 | 7269.25 | 8077.9 | 6327.48 | 5309.15 | 5350.09 | 2718.25 | 2571.75 | 2708.48 | 4458.04 | 7965.3 | 4850.63 |
| 1983 | 3853.94 | 3721.16 | 6487.33 | 9868.48 | 8111.45 | 4685.52 | 4623.89 | 2337.71 | 1860.33 | 2351.41 | 3311.58 | 3546.29 | 4563.26 |
| 1984 | 2249.56 | 4279.58 | 5755.11 | 7133.05 | 7104.83 | 6292.04 | 5622.93 | 2100.3 | 1469.37 | 2145.97 | 3973.16 | 2566.8 | 4224.39 |
| 1985 | 2725.83 | 3234.21 | 8675.96 | 6254.28 | 4020.65 | 2438.09 | 1815.76 | 1981.55 | 2069.5 | 4086.33 | 5618.09 | 4298.25 | 3934.88 |
| 1986 | 2263.08 | 3112.44 | 5023.07 | 6661.1 | 6723.92 | 5420.82 | 5072.4 | 3204.3 | 3331.31 | 9482.54 | 4851.65 | 3683.49 | 4902.51 |
| 1987 | 2538.02 | 2624.38 | 3066.82 | 3921.9 | 2563.88 | 2464.15 | 2031.88 | 2345.29 | 2214.58 | -9999 | -9999 | -9999 | -9999 |
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| Avg | 1893.7 | 2332.32 | 3995.77 | 5423.94 | 4908 | 3989.04 | 3187.31 | 1979.12 | 1869.63 | 2027.41 | 2132.64 | 1910.37 | 2995.6 |
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| Std Dev | 996.19 |
1050.37 |
1736.46 |
2122.32 |
2097.38 |
1827.58 |
1576.72 |
812.41 |
892.11 |
1524.49 |
1292.79 |
1182.03 |
950.42 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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