This paper describes agricultural weather information systems based on modern information technology. Collected regional weather information database supports to select suitable crops for the regions, to forecast quality and quantity of the crops, and to avoid suffering damages to the crops by disease and pests. Further, applications of information processing, for example temperature accumulation, can be carried out easily by using this database. Introducing weather forecasting data can help to avoid agricultural disasters of ground frost, heavy rain, and strong wind.
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