--_This type is found in all of the territory
west of the Cascade and Sierra Nevada ranges, and also obtains in a
fringe of country to the eastward of the mountain summits. The
distinguishing characteristic of the Pacific type is a wet season,
extending from October to March, and a practically rainless summer,
except in northern California and parts of Oregon and Washington.
About half of the yearly precipitation comes in the months of
December, January, and February, the remaining half being
distributed throughout the seven months--September, October,
November, March, April, May, and June."
_"Sub-Pacific Type.--_The term 'Sub-Pacific' has been given to that
type of rainfall which obtains over eastern Washington, Nevada, and
Utah. The influences that control the precipitation of this region
are much similar to those that prevail west of the Sierra Nevada and
Cascade ranges. There is not, however, as in the eastern type, a
steady diminution in the precipitation with the approach of spring,
but rather a culmination in the precipitation."
_"Arizona Type.--_The Arizona Type, so called because it is more
fully developed in that territory than elsewhere, prevails over
Arizona, New Mexico, and a small portion of eastern Utah and Nevada.
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