Abstract
To what extent does the annual rainfall vary from year to year over the North American continent? To answer this question satisfactorily it was necessary to have reliable values for the average rainfall over the continent for a period sufficiently long to include extreme variations and to have complete records for the entire area and for the same period of years throughout.The time selected was from 1881 to 1930—50 years. A longer period would have been more desirable, but necessary records were not available in outlying regions. For the area of the United States it was a comparatively easy matter to compile reliable data. The basic values for the States and for certain selected islands of the West Indies represent regional averages, rather than averages for single localities. In the United States the average number of stations per state was about 100. The use of regional averages is a smoothing operation and most likely to reveal long‐period variations in the rainfall.
Published Version
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