Some Aspects of Climatic Variability - With Special Reference to Rainfall in New South Wales
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This Department recently received a terse inquiry from a correspondent asking whether rainfall in New South Wales is declining and requesting data indicating average precipitation over periods of ten years. The question whether rainfall is declining, increasing or shows no variation is more than an academic one in a country such as Australia, where average precipitation over large areas is all too low and where agricultural and pastoral activities measure large in its economy. It should be of particular interest to those concerned with future policy not only of agriculture but of such kindred national undertakings as water and soil conservation and afforestation. But the subject is of considerable general interest, and the following is an examination of rainfall variability insofar as the comparatively meagre data available will allow.