Problem to be solved: to identify the risk potential period more accurately and to improve the accuracy of estimation of agricultural meteorological hazard risk.By the functional blocks 11-14, an appropriate initial value calculated by accumulating the average factor of the growth factor based on the past meteorological element from the normal year development period to the accumulated value of the growth factor in the day when the growth of the crop has already progressed is given. Based on this initial value, the growth stage of the crop is accurately estimated by integrating growth factors from the date of birth.In addition, the evaluation value calculation unit 15 and the risk estimation unit 16 set the risk possibility period using the growth stage of the crop estimated at the time of the accurate estimation as described above Based on the risk factor based on the risk factors of the year, the evaluation value for the risk estimation is calculated by using the risk factor of the year.Diagram
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