YUMA WINTER MICROCLIMATE
ARMY NATICK LABS MA EARTH SCIENCES LAB
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This study consists of an analysis of winter temperatures at and near the ground and wind velocities at standard heights, at three sites within Yuma Proving Ground. Two of the sites were selected for their representativeness of surface types characterizing the desert basins of southwestern United States. The third site was selected to represent the many low rocky mountain areas of the desert. The study develops information on the nature of diurnal temperature fluctuations, based on hourly records of temperature of January and February 1957, at ten levels ranging from 25 centimeters below the ground to 200 centimeters above the ground surface. In addition, hourly records of wind speed and direction at the standard shelter height were kept and analyzed.