Weather is one of the most difficult variables with which the agricultural economist must deal, but deal with it he must. We have sought a magic number which would represent climatic change and we have tried to put parameters around weather that would bring it within the confines of our tables and models. But the problem remains intractable. In any given year, the Indian monsoon and the amount of rainfall on the Great Plains of the United States and Canada and the steppes of Russia will have more influence on the price of wheat than the price support and adjustment programs of the United States and the Common Market. Yet for any given year, what will happen so far as the weather is concerned simply cannot be predicted.