Results
| Country: | Brasil
| | Station: | Obidos | | River: | Amazonas | | Area: | 4618746 km2 | | Lat: | -1.9 | | Lon: | -55.5 | | Source: | ANEEL | | PointID: | 33 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1968 | | Ending Year: | 1995 | | Total Years: | 28 | | Total Usable Years: | 27 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1968 | 4200 | 6440 | 150906 | 165955 | 197517 | 195815 | 171107 | 152973 | 141403 | 133915 | 125984 | 126603 | 131068 |
| 1969 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1970 | 119875 | 141643 | 164190 | 195166 | 229636 | 229568 | 211623 | 181427 | 151808 | 128829 | 103709 | 101306 | 163232 |
| 1971 | 121430 | 149480 | 176992 | 226688 | 261679 | 272475 | 252551 | 210186 | 167713 | 140602 | 130450 | 135204 | 187121 |
| 1972 | 137477 | 160925 | 195863 | 222757 | 253999 | 255118 | 230009 | 190656 | 159462 | 138810 | 119985 | 126428 | 182624 |
| 1973 | 141069 | 147896 | 163098 | 186620 | 225548 | 247185 | 233865 | 206769 | 172870 | 151191 | 137754 | 140584 | 179537 |
| 1974 | 149994 | 171653 | 201498 | 237450 | 265884 | 264477 | 239839 | 204956 | 169234 | 145906 | 137666 | 137884 | 193870 |
| 1975 | 147538 | 166683 | 195885 | 240981 | 275996 | 284709 | 260226 | 224006 | 182260 | 148303 | 122127 | 121823 | 197545 |
| 1976 | 140568 | 165096 | 193879 | 249110 | 295105 | 294984 | 266735 | 207271 | 157634 | 123402 | 103780 | 115249 | 192734 |
| 1977 | 136886 | 146299 | 159473 | 193864 | 245339 | 259631 | 236234 | 189981 | 151345 | 129495 | 132465 | 140993 | 176834 |
| 1978 | 157920 | 164843 | 184869 | 212143 | 243315 | 246015 | 220491 | 182517 | 148900 | 125930 | 123287 | 129289 | 178293 |
| 1979 | 150800 | 161129 | 174038 | 210148 | 249845 | 255581 | 219929 | 168903 | 134234 | 101675 | 100883 | 109182 | 169696 |
| 1980 | 132554 | 143390 | 148037 | 161261 | 172990 | 177373 | 168700 | 148501 | 119453 | 98438 | 113797 | 125181 | 142473 |
| 1981 | 134693 | 147788 | 161753 | 185653 | 194473 | 191087 | 181720 | 161760 | 134728 | 101002 | 94467 | 108544 | 149806 |
| 1982 | 141102 | 168982 | 197510 | 233493 | 279744 | 279290 | 242361 | 188877 | 150326 | 119603 | 107828 | 125278 | 186200 |
| 1983 | 142434 | 150474 | 154381 | 168591 | 178860 | 180594 | 163721 | 137427 | 108586 | 93971 | 96676 | 114992 | 140892 |
| 1984 | 138522 | 154686 | 180350 | 213820 | 250642 | 243143 | 218606 | 182448 | 151132 | 126315 | 118151 | 126384 | 175350 |
| 1985 | 148235 | 168309 | 170427 | 173663 | 187903 | 194113 | 182050 | 162528 | 146596 | 128802 | 122680 | 132778 | 159840 |
| 1986 | 146843 | 156971 | 180308 | 215738 | 240035 | 238853 | 232662 | 199794 | 156693 | 136130 | 138479 | 144463 | 182247 |
| 1987 | 152765 | 163919 | 187416 | 212683 | 232552 | 220974 | 192352 | 159006 | 132938 | 104214 | 99618 | 116190 | 164552 |
| 1988 | 137696 | 155522 | 181565 | 197048 | 222856 | 230333 | 212938 | 175638 | 137678 | 101367 | 103998 | 129927 | 165547 |
| 1989 | 145012 | 167152 | 214195 | 266058 | 297173 | 306318 | 280389 | 228445 | 173449 | 138156 | 133558 | 133385 | 206941 |
| 1990 | 129958 | 148544 | 184719 | 211106 | 232253 | 231896 | 213863 | 182700 | 149524 | 108906 | 93498 | 121453 | 167368 |
| 1991 | 146911 | 166353 | 171986 | 204159 | 236454 | 245813 | 221418 | 189862 | 152166 | 109935 | 86109 | 102156 | 169444 |
| 1992 | 117174 | 131719 | 144921 | 172830 | 182013 | 169148 | 152515 | 138690 | 122713 | 111102 | 98973 | 120867 | 138555 |
| 1993 | 145326 | 161230 | 192222 | 233010 | 256561 | 249301 | 221795 | 181417 | 148364 | 124831 | 120248 | 141173 | 181290 |
| 1994 | 163081 | 188914 | 225140 | 255163 | 275030 | 275655 | 257914 | 210178 | 167372 | 140251 | 120416 | 124908 | 200335 |
| 1995 | 143358 | 149222 | 157182 | 178280 | 212977 | 221718 | 199201 | 163860 | 117002 | 75602 | 80662 | 118923 | 151499 |
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| Avg | 136053 | 152047 | 178252 | 208275 | 236903 | 239302 | 217956 | 182621 | 148355 | 121729 | 113602 | 124857 | 171663 |
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| Std Dev | 27905.8 |
30792.8 |
19822.2 |
28210.8 |
34242.9 |
35920.5 |
32463.5 |
23983.5 |
17977.2 |
18660.8 |
16287.2 |
11454.4 |
19577.4 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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