Annual rainfall in the United Sates is about 4 inches in the desert regions to more than 100 inches in the mountain ranges of Washington and Oregon. Here in Eastern Pennsylvania, the average rainfall is about 45 inches.
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Average annual rainfall varies between 750 and 1000 millimetres (30 to 40 inches) in the drier eastern part of the country, while most other parts have average yearly totals of between 1000 and 1350mm (40 to 54 inches).
The highest annual rainfall in a calendar year (Australian record 11251 mm, Bellenden Ker (Top Station), Qld, 1979).
The highest monthly rainfall total (Australian record 5387 mm, Bellenden Ker (Top Station) Qld, Jan 1979).
An index for assessing the variability of annual rainfall.
Variability Index = {(90th percentile -10th percentile) / 50th percentile}
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The ratio of the normal annual rainfall to the normal annual evaporation.
 See also: Rainfall, Water, Period, Element, Climate
  
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