No doubt weather is the most important factor determining whether an agricultural enterprise is successful or not. Changes in the weather greatly affect growth, state and amount of crops, its disease incidence, its need for water and fertilizers. Not only plants, but also a whole agricultural market highly depends on weather. Directly and due to some sideway reasons, weather is guilty of loss of the annual world crop in the amount of its three out of four! A mistake in weather forecast can result in crop loss.