Results
| Country: | Brazil
| | Station: | Obidos | | River: | Amazonas | | Area: | 4618746 km2 | | Lat: | -1.91 | | Lon: | -55.55 | | Source: | | | PointID: | 514 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1928 | | Ending Year: | 1983 | | Total Years: | 56 | | Total Usable Years: | 34 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
|---|
| 1928 | 111000 | 138000 | 181000 | 206000 | 217000 | 214000 | 198000 | 169000 | 117000 | 85300 | 85500 | 90200 | 151000 |
| 1929 | 104000 | 128000 | 142000 | 182000 | 209000 | 215000 | 199000 | 172000 | 137000 | 90900 | 80100 | 93900 | 146075 |
| 1930 | 114000 | 144000 | 171000 | 194000 | 204000 | 201000 | 192000 | 174000 | 138000 | 101000 | 89800 | 93500 | 151358 |
| 1931 | 110000 | 133000 | 163000 | 190000 | 201000 | 194000 | 174000 | 140000 | 97600 | 81500 | 86400 | 94000 | 138708 |
| 1932 | 119000 | 162000 | 188000 | 205000 | 211000 | 208000 | 196000 | 170000 | 131000 | 93500 | 85800 | 93000 | 155192 |
| 1933 | 110000 | 140000 | 166000 | 189000 | 208000 | 207000 | 200000 | 168000 | 107000 | 76900 | 80500 | 91400 | 145317 |
| 1934 | 110000 | 146000 | 182000 | 202000 | 220000 | 216000 | 210000 | 183000 | 149000 | 119000 | 118000 | 129000 | 165333 |
| 1935 | 143000 | 160000 | 180000 | 203000 | 221000 | 216000 | 197000 | 167000 | 129000 | 91200 | 75700 | 79800 | 155225 |
| 1936 | 105000 | 142000 | 162000 | 176000 | 193000 | 181000 | 162000 | 135000 | 91900 | 87100 | 81900 | 82300 | 133267 |
| 1937 | 96000 | 132000 | 158000 | 180000 | 191000 | 193000 | 181000 | 156000 | 109000 | 84500 | 80800 | 76400 | 136475 |
| 1938 | 87000 | 124000 | 159000 | 187000 | 207000 | 208000 | 196000 | 178000 | 139000 | 91100 | 87600 | 98200 | 146825 |
| 1939 | 122000 | 153000 | 172000 | 192000 | 212000 | 216000 | 208000 | 191000 | 164000 | 138000 | 116000 | 111000 | 166250 |
| 1940 | 133000 | 152000 | 160000 | 175000 | 191000 | 194000 | 185000 | 164000 | 136000 | 110000 | 111000 | 106000 | 151417 |
| 1941 | 129000 | 153000 | 175000 | 194000 | 201000 | 195000 | 187000 | 161000 | 119000 | 81800 | 87200 | 90100 | 147758 |
| 1942 | 116000 | 138000 | 166000 | 187000 | 198000 | 202000 | 197000 | 169000 | 122000 | 88100 | 88400 | 92500 | 147000 |
| 1943 | 97500 | 130000 | 164000 | 196000 | 211000 | 208000 | 202000 | 186000 | 149000 | 96000 | 82700 | 98600 | 151733 |
| 1944 | 118000 | 148000 | 179000 | 205000 | 223000 | 222000 | 212000 | 190000 | 151000 | 105000 | 88700 | 92900 | 161217 |
| 1945 | 112000 | 125000 | 156000 | 184000 | 205000 | 205000 | 184000 | 142000 | 104000 | 82000 | 83400 | 99200 | 140133 |
| 1946 | 134000 | 167000 | 187000 | 205000 | 217000 | 216000 | 201000 | 178000 | 144000 | 102000 | 87500 | 93800 | 161025 |
| 1947 | 113000 | 144000 | 169000 | 177000 | 188000 | 194000 | 189000 | 171000 | 145000 | -9999 | -9999 | -9999 | -9999 |
| 1948 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1949 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1950 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1951 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1952 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1953 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1954 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1955 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1956 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1957 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1958 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1959 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1960 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1961 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1962 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1963 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1964 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1965 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1966 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1967 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1968 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1969 | -9999 | -9999 | 154800 | 176500 | 204200 | 203100 | 182600 | 158000 | 136300 | 123700 | 113600 | 114400 | -9999 |
| 1970 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1971 | -9999 | -9999 | 184000 | 216000 | 232000 | 236000 | 228000 | 207000 | 174000 | 131000 | 114000 | 121000 | -9999 |
| 1972 | 125000 | 165000 | 199000 | 214000 | 228000 | 229000 | 218000 | 195000 | 164000 | 128000 | 103000 | 110000 | 173167 |
| 1973 | 114000 | 129000 | 155000 | 182000 | 212000 | 225000 | 217000 | 199000 | 168000 | 135000 | 108000 | 114000 | 163167 |
| 1974 | 133000 | 166000 | 195000 | 220000 | 236000 | 235000 | 221000 | 197000 | 163000 | 125000 | 108000 | 108000 | 175583 |
| 1975 | 128000 | 160000 | 190000 | 221000 | 241000 | 246000 | 233000 | 211000 | 177000 | 129000 | 88800 | 88000 | 176067 |
| 1976 | 137014 | 173463 | 188599 | 217851 | 236583 | 237857 | 231782 | 209860 | 176849 | 105710 | 71517 | 93471 | 173380 |
| 1977 | 125180 | 136276 | 161354 | 191346 | 216407 | 225957 | 220863 | 203291 | 163600 | 119658 | 121472 | 136884 | 168524 |
| 1978 | 162066 | 172727 | 178406 | 196602 | 216737 | 214865 | 214682 | 198445 | 157334 | 106555 | 101671 | 113575 | 169472 |
| 1979 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1980 | 122097 | 138560 | 147077 | 165309 | 177716 | 181162 | 173405 | 146962 | 107833 | 88424 | 101766 | 112985 | 138608 |
| 1981 | 124844 | 146411 | 165773 | 187223 | 193275 | 191073 | 184373 | 165606 | 126318 | 90621 | 85273 | 97059 | 146487 |
| 1982 | 135642 | 173354 | 194967 | 214043 | 234460 | 234166 | 218202 | 188663 | 149532 | 107810 | 96107 | 113389 | 171695 |
| 1983 | 136882 | 150963 | 156880 | 173475 | 183287 | 183588 | 168122 | 130230 | 96937 | 84789 | 87024 | -9999 | -9999 |
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| Avg | 120233 | 147444 | 171238 | 194071 | 210293 | 210538 | 199425 | 174971 | 137582 | 102505 | 93663.4 | 100921 | 155430 |
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| Std Dev | 15152.9 |
14659.5 |
14474.2 |
14798.5 |
15837 |
16868.3 |
18143.2 |
21470 |
24309 |
17942.1 |
13478 |
13830.3 |
12633.7 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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