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The general effects of weather on the erosion and deterioration of materials have long been recognized, but only in the last few years has it been possible to relate cause and effect by direct measurements. To provide some guidance on the use of meteorological parameters in developing criteria for the design of structures, this paper, while not exhaustive, outlines some of the methods of measuring atmospheric elements, and also discusses some of the local variations which may be expected when the basic data used are observed from a standard weather station. The variations in the weather elements from day to day, month to month, and even year to year, require careful consideration when weathering tests are conducted. The weather records for the test period should be compared with the means obtained from the climatological records for the area and the tests evaluated accordingly. Exposed materials are affected by solar radiation, terrestrial radiation, air temperature, humidity, precipitation, wind, and atmospheric impurities.
Haynes, B. C.
Chief, U. S. Weather Bureau, Washington, D. C.