Estimation of number of days above or below selected temperatures

Regression equations were developed and graphed to provide an estimate of the number of days in a month the temperature was above or below selected temperature thresholds. These included: the mean number of days when the maximum temperature is equal to or greater than the following temperatures: 65°F, 70°F, 75°F, 80°F, 85°F, 90°F, 95°F, I00°F and when the maximum temperature was less than 32°F. In addition, this study included estimation of the mean number of days when the minimum temperature is equal to or less than the following levels: 0°F, I0°F, 20°F, and 32°F. The procedure involved regressing the probit transformation of the percent of days with the monthly mean maximum or mean minimum temperature. The developed equations were tested for the Columbia Basin states and Nevada. Results indicate that this procedure provides a reliable and rapid method for estimation and gives field climatologists a useful tool to meet users' requests. Clarence M. Sakamoto. Includes bibliographical references (page 7).