Scientific Investigations Report 2007–5038
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5038
Table 10. Monthly precipitation and dual-coefficient FAO Penman-Monteith recharge using daily values, 1995–2005, Spokane WSO Airport, Washington.
[Western Regional Climate Center (2006a, 2006b), U.S. Department of Commerce (2006). Mean precipitation values are through December 31, 2005. Abbreviations: in., inch; ratio, recharge to precipitation ratio]
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | Period of record mean | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| January | Precipitation (in.) | 2.5 | 1.8 | 2.3 | 1.6 | 1.5 | 2.8 | 2.3 | 1.7 | 2.2 | 1.9 | 2.1 | 0.72 | 1.2 | 3.5 | 1.5 | 1.2 | 2.0 |
| Recharge (in.) | 1.5 | 1.5 | 1.6 | 1.0 | 1.0 | 1.9 | 1.8 | 1.1 | 1.6 | 1.5 | 1.5 | .42 | .66 | 2.9 | 1.2 | .73 | ||
| Ratio (percent) | 59 | 85 | 72 | 67 | 68 | 70 | 78 | 65 | 73 | 75 | 73 | 58 | 55 | 84 | 77 | 62 | ||
| February | Precipitation (in.) | 1.1 | .84 | 1.9 | .95 | .97 | 1.7 | 3.0 | 1.5 | 1.7 | 3.3 | 1.7 | .70 | 1.1 | .56 | 1.5 | .1 | 1.5 |
| Recharge (in.) | .36 | .00 | 1.0 | .62 | .00 | 1.1 | 2.4 | .73 | .43 | 1.9 | .73 | .20 | .43 | .00 | .85 | .00 | ||
| Ratio (percent) | 33 | 0 | 56 | 65 | 0 | 65 | 81 | 50 | 25 | 59 | 44 | 29 | 40 | 1 | 58 | 0 | ||
| March | Precipitation (in.) | .91 | 2.4 | .47 | 1.2 | .54 | 3.8 | 1.7 | 2.5 | 1.3 | .76 | 1.7 | 1.4 | 1.1 | 2.2 | .70 | 2.1 | 1.4 |
| Recharge (in.) | .00 | 1.3 | .00 | .00 | .00 | 2.3 | .63 | .84 | .05 | .00 | .28 | .00 | .00 | .05 | .00 | .57 | ||
| Ratio (percent) | 0 | 53 | 0 | 0 | 0 | 61 | 38 | 34 | 4 | 0 | 17 | 0 | 0 | 2 | 0 | 27 | ||
| April | Precipitation (in.) | 1.3 | 1.4 | .71 | 2.0 | 1.7 | 1.0 | 2.2 | 2.6 | 1.0 | .44 | 2.2 | 1.8 | .94 | 1.5 | .60 | .80 | 1.1 |
| Recharge (in.) | .00 | .00 | .00 | .00 | .00 | .00 | .30 | .51 | .00 | .00 | .92 | .00 | .00 | .00 | .00 | .00 | ||
| Ratio (percent) | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 19 | 0 | 0 | 41 | 0 | 0 | 0 | 0 | 0 | ||
| May | Precipitation (in.) | 3.2 | 1.8 | .31 | 1.4 | 1.4 | 1.4 | 1.8 | 2.3 | 3.1 | .76 | 2.3 | .82 | 1.2 | 1.6 | 3.8 | 3.6 | 1.4 |
| Recharge (in.) | .13 | .00 | .00 | .00 | .00 | .05 | .00 | .27 | .79 | .00 | .04 | .00 | .00 | .33 | 1.9 | .41 | ||
| Ratio (percent) | 4 | 0 | 0 | 0 | 0 | 3 | 0 | 12 | 25 | 0 | 2 | 0 | 0 | 21 | 50 | 11 | ||
| June | Precipitation (in.) | 2.0 | 1.2 | 1.6 | .55 | .95 | 2.2 | 1.2 | .53 | .90 | 1.4 | .98 | 1.1 | 1.5 | .27 | 1.1 | 1.4 | 1.2 |
| Recharge (in.) | .08 | .00 | .21 | .00 | .00 | .36 | .00 | .00 | .00 | .08 | .00 | .00 | .00 | .00 | .00 | .00 | ||
| Ratio (percent) | 4 | 0 | 13 | 0 | 0 | 16 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| July | Precipitation (in.) | 2.4 | .61 | 1.1 | 2.2 | .02 | 1.1 | .34 | .82 | .28 | .18 | .36 | .32 | .28 | .02 | .11 | 1.1 | .6 |
| Recharge (in.) | 1.2 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .05 | ||
| Ratio (percent) | 49 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | ||
| August | Precipitation (in.) | 1.1 | .22 | .36 | 1.3 | .10 | .64 | .83 | .26 | .28 | 1.1 | .05 | .29 | 1.3 | .46 | 1.9 | .49 | .6 |
| Recharge (in.) | .15 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .36 | .00 | .28 | .00 | ||
| Ratio (percent) | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 28 | 0 | 15 | 0 | ||
| September | Precipitation (in.) | .00 | .02 | .41 | .30 | .47 | 1.9 | .83 | .97 | .24 | .05 | 1.2 | .18 | .56 | .61 | .72 | .86 | .8 |
| Recharge (in.) | .00 | .00 | .00 | .00 | .00 | .38 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | .00 | ||
| Ratio (percent) | 0 | 0 | 0 | 0 | 0 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| October | Precipitation (in.) | 3.1 | .38 | .85 | .50 | 2.8 | 1.6 | 3.3 | 1.7 | .30 | .93 | .71 | 2.1 | .25 | .57 | 1.1 | 1.1 | 1.2 |
| Recharge (in.) | 1.2 | .00 | .00 | .00 | 1.0 | .15 | 1.9 | .00 | .00 | .00 | .00 | .31 | .00 | .00 | .00 | .21 | ||
| Ratio (percent) | 40 | 0 | 0 | 0 | 36 | 9 | 59 | 0 | 0 | 0 | 0 | 14 | 0 | 0 | 0 | 19 | ||
| November | Precipitation (in) | .90 | 3.1 | 3.1 | .80 | 2.3 | 1.4 | 4.1 | 2.0 | 3.8 | 2.1 | 1.2 | 2.6 | 1.7 | 1.6 | 1.2 | 2.0 | 2.1 |
| Recharge (in) | .00 | 2.0 | 2.17 | .00 | 1.54 | .00 | 3.43 | .92 | 2.0 | .58 | .20 | 1.6 | .39 | .41 | .00 | .91 | ||
| Ratio (percent) | 0 | 64 | 71 | 0 | 66 | 0 | 84 | 46 | 53 | 28 | 17 | 61 | 24 | 25 | 0 | 46 | ||
| December | Precipitation (in.) | 1.8 | 1.3 | 2.2 | 2.0 | 1.7 | 2.7 | 4.1 | 1.1 | 3.3 | 2.3 | 1.1 | 2.1 | 3.4 | 2.3 | 1.4 | 3.0 | 2.2 |
| Recharge (in.) | .73 | .66 | 1.8 | 1.1 | 1.1 | 2.0 | 3.8 | .52 | 2.6 | 1.7 | .71 | 1.6 | 2.6 | 1.8 | .85 | 2.7 | ||
| Ratio (percent) | 40 | 50 | 81 | 59 | 67 | 74 | 92 | 49 | 79 | 75 | 67 | 75 | 77 | 80 | 61 | 90 | ||
| Annual | Precipitation (in.) | 20 | 15 | 15 | 14 | 15 | 22 | 26 | 18 | 18 | 15 | 15 | 14 | 14 | 15 | 15 | 18 | 16.1 |
| Recharge (in.) | 5.3 | 5.5 | 6.9 | 2.8 | 4.7 | 8.3 | 14 | 4.9 | 7.5 | 5.7 | 4.4 | 4.1 | 4.4 | 5.5 | 5.0 | 5.6 | ||
| Ratio (percent) | 26 | 36 | 45 | 19 | 33 | 38 | 56 | 27 | 41 | 38 | 28 | 29 | 31 | 37 | 32 | 31 | ||
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