A general assessment of the potential reduction in variance of predicted climatological statistics was made on the supposition that long-term seasonal-to-annual climatic averages are causally predictable. The residual variance, stemming from short-term unpredictable variability (the “weather”), was found to be of the order of magnitude comparable to observed interannual changes when estimated on a local basis. When the geographic area was extended to global dimensions, the latter became dominant, indicating on this scale the potential for a significant reduction in climatic mean variance if a seasonal climatic prediction model were available. The relevance of these results to food reserve policy and to the directions of climatological research is discussed.

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