MAXIMUM HOURLY DURATIONS OF HIGH AND LOW TEMPERATURES
INDIANA STATE UNIV TERRE HAUTE TERRE HAUTE
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A method for predicting the most probable duration of high and low temperatures from the absolute maximum and absolute minimum was developed. The method is applicable for any temperature, any month, any place in the world. It was the purpose of this contract to make extensive tests of the method and make modifications if necessary. The tests were conducted using actual data on temperature durations from United States including Alaska and Canadian stations for January and July of 1961, 1962, and 1963 and from fifteen other stations all over the world for July for as long as they had been keeping records of durations. The tests were made by comparing the actual durations with those predicted by the model. For low temperatures -40F, -30F, -20F the prediction method performs almost perfectly. For high temperatures 110F, 100F, 90F the method has a tendency to overpredict the durations. This can be remedied by assuming a maximum value of 20 hours duration for temperatures of 110F and 100F and above, and by using the predicted values for a mean year or for one year in five for temperatures of 90F and above. For temperatures of 80F and above there is close agreement between the actual and predicted temperature durations.