MAXIMUM-MINIMUM TEMPERATURES AS A BASIS FOR EVALUATING THERMOPERIODIC RESPONSE1

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Abstract
Since hourly temperatures are not commonly recorded at many locations, a procedure is tested involving the use of daily maximum-minimum temperatures in estimating the number of hours per day above certain temperature thresholds. The procedure assumes that the daily temperature curve may be approximated by a triangle. The number of hours per day, X, above base temperature, b, is estimated as: X=[24(Max-b)]/[Max-Min] Correlation-regression analyses of data from five diverse locations show close relationship between actual and estimated hours. Results indicate that simple computations involving only daily maximum-minimum temperatures may be used for evaluating thermoperiodic response when variations in temperature exposure of less than 2.5 hours per day are not critical. Abstract Since hourly temperatures are not commonly recorded at many locations, a procedure is tested involving the use of daily maximum-minimum temperatures in estimating the number of hours per day above certain temperature thresholds. The procedure assumes that the daily temperature curve may be approximated by a triangle. The number of hours per day, X, above base temperature, b, is estimated as: X=[24(Max-b)]/[Max-Min] Correlation-regression analyses of data from five diverse locations show close relationship between actual and estimated hours. Results indicate that simple computations involving only daily maximum-minimum temperatures may be used for evaluating thermoperiodic response when variations in temperature exposure of less than 2.5 hours per day are not critical.

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