Scientific Investigations Report 2007ā€“5038

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007ā€“5038

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Table 8. Mean monthly precipitation at active weather stations and calculated Eastern Snake Plain Aquifer Model recharge (lava-rock parameters).

[Western Regional Climate Center (2006a, 2006b). Mean precipitation values are through December 31, 2005. Abbreviations: Exp. Stat., experiment station; WSO, Weather Service Office; in., inch; ratio, recharge to precipitation ratio]

    Station name
Bayview Model Basin Coeur Dā€™ Alene 1E Newport Priest River Exp. Stat. Sandpoint Exp. Stat. Spokane WSO Airport
January Precipitation (in.) 2.8 3.4 3.2 4.0 4.1 2.0
    Recharge (in.) 1.5 1.8 1.7 2.2 2.3 .95
    Ratio (percent) 52 53 53 55 56 48
February Precipitation (in.) 2.1 2.5 2.4 3.0 3.1 1.5
    Recharge (in.) 1.0 1.2 1.2 1.5 1.7 .70
    Ratio (percent) 49 50 50 52 53 46
March Precipitation (in.) 2.0 2.3 2.3 2.7 2.8 1.4
    Recharge (in.) .99 1.13 1.13 1.39 1.42 .62
    Ratio (percent) 48 49 49 51 51 45
April Precipitation (in.) 1.8 1.7 1.8 2.1 2.1 1.1
    Recharge (in.) .82 .81 .86 1.02 1.01 .48
    Ratio (percent) 47 47 47 49 49 43
May Precipitation (in.) 2.1 2.0 2.1 2.3 2.3 1.4
    Recharge (in.) 1.0 .97 1.0 1.2 1.2 .64
    Ratio (percent) 49 48 49 50 50 45
June Precipitation (in.) 1.8 1.8 1.9 2.3 2.3 1.2
    Recharge (in.) .85 .85 0.88 1.12 1.12 .52
    Ratio (percent) 47 47 48 49 49 44
July Precipitation (in.) 1.0 .7 .9 1.0 1.0 .55
    Recharge (in.) .41 .28 .38 .44 .41 .20
    Ratio (percent) 42 39 41 42 42 37
August Precipitation (in.) 1.1 .9 1.0 1.2 1.2 .63
    Recharge (in.) .46 .38 .41 .50 .51 .24
    Ratio (percent) 43 41 42 43 43 38
September Precipitation (in.) 1.2 1.3 1.4 1.6 1.7 .80
    Recharge (in.) .53 .56 .61 .72 .79 .32
    Ratio (percent) 44 44 45 46 47 40
October Precipitation (in.) 2.1 2.0 2.2 2.6 2.6 1.2
    Recharge (in.) 1.0 .95 1.1 1.3 1.3 .51
    Ratio (percent) 49 48 49 51 51 43
November Precipitation (in.) 2.9 3.1 3.5 4.0 4.3 2.1
    Recharge (in.) 1.5 1.6 1.9 2.2 2.4 1.0
    Ratio (percent) 52 53 54 55 56 49
December Precipitation (in.) 3.2 3.6 3.7 4.4 4.6 2.2
    Recharge (in.) 1.7 2.0 2.0 2.5 2.6 1.1
    Ratio (percent) 53 54 55 56 57 49
Annual Precipitation (in.) 24 25 26 31 32 16
    Recharge (in.) 12 13 13 16 17 7.3
    Ratio (percent) 49 50 50 52 52 45

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