A procedure to estimate daily solar radiation from other climatic variables which are easy to measure and are readily available has been developed. Two equations were developed using regressing techniques and measured climatic variables for a ten year period at Columbia, Missouri. When date and temperature were used, an R-square value of 76 percent was obtained. Adding the daily minimum relative humidity increased the R-square value to 85 percent.
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Cengiz et al. (1981) studied this question.