Scientific Investigations Report 2007–5038

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5038

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Table 9. Mean monthly precipitation at active weather stations and single-coefficient FAO Penman-Monteith recharge, Spokane WSO Airport, Washington.

[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]

    Spokane WSO Airport
Grass
reference		 Alfalfa
reference
January Precipitation (in.) 2.0 2.0
    Recharge (in.) 1.4 1.5
    Ratio (percent) 71 77
February Precipitation (in.) 1.5 1.5
    Recharge (in.) .36 .59
    Ratio (percent) 24 38
March Precipitation (in.) 1.4 1.4
    Recharge (in.) 0 0
    Ratio (percent) 0 0
April Precipitation (in.) 1.1 1.1
    Recharge (in.) 0 0
    Ratio (percent) 0 0
May Precipitation (in.) 1.4 1.4
    Recharge (in.) 0 0
    Ratio (percent) 0 0
June Precipitation (in.) 1.2 1.2
    Recharge (in.) 0 0
    Ratio (percent) 0 0
July Precipitation (in.) .6 .6
    Recharge (in.) 0 0
    Ratio (percent) 0 0
August Precipitation (in.) .6 .6
    Recharge (in.) 0 0
    Ratio (percent) 0 0
September Precipitation (in.) .8 .8
    Recharge (in.) 0 0
    Ratio (percent) 0 0
October Precipitation (in.) 1.2 1.2
    Recharge (in.) 0 0
    Ratio (percent) 0 0
November Precipitation (in.) 2.1 2.1
    Recharge (in.) 1.3 1.4
    Ratio (percent) 60 68
December Precipitation (in.) 2.2 2.2
    Recharge (in.) 1.8 1.9
    Ratio (percent) 81 85
Annual Precipitation (in.) 16 16
    Recharge (in.) 3.4 3.9
    Ratio (percent) 21 24

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