Results
| Country: | U.S.A.
| | Station: | GRAND COULEE, WASH. | | River: | COLUMBIA RIVER | | Area: | 193461.53 | | Lat: | 47.96 | | Lon: | -118.98 | | Source: | USGS | | PointID: | 12436500 | | Area Units: | km2 | | Discharge Units: | m3/sec | | Starting Year: | 1983 | | Ending Year: | 1993 | | Total Years: | 11 | | Total Usable Years: | 8 | |
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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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| 1983 | 2575.75 | 2440.72 | 2135.38 | 1778.87 | 2362.64 | 2472.74 | 2414.8 | 2766.94 | 1518.64 | 1265.04 | 1436.24 | 2301.26 | 2122.42 |
| 1984 | 2257.23 | 2445.71 | 1640.29 | 720.76 | 1831.93 | 1737.63 | 1951.22 | 2647.91 | 1494.48 | 1342.77 | 1190.16 | 2243.89 | 1792 |
| 1985 | 3111.4 | 2606.28 | 1478.88 | 1082.18 | 1624.48 | 2002.3 | 2088.24 | 1626.95 | 1168.93 | 1566.48 | 1740.83 | 2447.5 | 1878.7 |
| 1986 | 2367.94 | 1745.74 | 1311.9 | 1367.62 | 1905.73 | 2133.97 | 2934.37 | 2549.26 | 1634.65 | 1343.41 | 1750.46 | 2062.85 | 1925.66 |
| 1987 | 2924.05 | 1931.62 | 1170.95 | 1123.15 | 2040.19 | 2364.19 | 2371.78 | 2132.36 | 1853.63 | 1850.38 | 1652.58 | 1937.98 | 1946.07 |
| 1988 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1989 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
| 1990 | 2324 | 2671.91 | 2390.78 | 1604.72 | 1585.11 | 3018.31 | 3045.36 | 2555.2 | 1597.46 | 1368.26 | 1932.16 | 2784.29 | 2239.8 |
| 1991 | 3297.56 | 2646.02 | 2246.73 | 2138.59 | 2832.98 | 2932.51 | 2546.25 | 3256.64 | 1833.81 | 1868.1 | 1886.48 | 1941.63 | 2452.28 |
| 1992 | 2588.72 | 1588.78 | 1360.31 | 1127.3 | 2638.05 | 3981.75 | 2152.73 | 2277.6 | 1435.95 | 1377.85 | 1541.58 | 2349.67 | 2035.02 |
| 1993 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 | -9999 |
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| Avg | 2680.83 | 2259.6 | 1716.9 | 1367.9 | 2102.64 | 2580.43 | 2438.09 | 2476.61 | 1567.19 | 1497.79 | 1641.31 | 2258.63 | 2048.99 |
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| Std Dev | 362.13 |
407.52 |
441.83 |
423.85 |
433.03 |
669.11 |
366.16 |
449.11 |
206.78 |
223.43 |
229.72 |
265.51 |
201.71 |
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| | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Avg Annual |
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