Local Variations
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Within Australia, patterns of precipitation show regional variation. Because of the general spatial coherence of rainfall over most of Australia, these variations have tended to affect small areas, but because these are generally the most populated parts of the continent, they are still of considerable importance.
In the South-West Land Division, rainfall during the May to August rainy season has declined by 20 percent since 1968, after being at its highest from 1915 to 1947. Floods that were once common have virtually disappeared. Aided by increased winter temperatures and evaporation, runoff has declined over the past forty years by as much as sixty percent.
- In southern Victoria, rainfall since 1997 has declined by as much as 30 percent, with Melbourne having not once exceeded its 1885 to 1996 average since 1997.
- In contrast, the 1950s in southern Victoria were consistently wet, with Western District lakes returning during the decade to levels seen before the 1850s and Corangamite almost overflowing, as it is believed to have done during the Little Ice Age.
- The eastern part of Tasmania has also seen a major decline in rainfall since the middle 1970s. In Hobart, the annual rainfall has declined by about one-sixth since that time, and not one of the nineteen wettest years since 1882 has occurred since 1976.
- In Gippsland, the coastal areas of New South Wales, and southern Queensland, the driest period since 1885 was not from 1922 to 1938, but approximately from 1901 to 1910, when the average annual rainfall at Sydney was 20 percent below its long-term mean. There was a slight increase in rainfall from 1916 to 1934 and then a decline to 1901-1910 levels from 1936 to 1948, before a return to the pre-1900 "flood-dominated" climate regime occurred in 1949.
- In northwestern Australia, rainfall was moderate from 1885 to about 1925, then declined from the late 1920s to the late 1960s (with very dry conditions during the 1950s), followed by rapid increases since then. In Darwin, six of the seven wettest wet seasons have occurred since 1995, and the major droughts that once affected the region frequently have virtually disappeared since 1971.
Read more about this topic: Climate Change In Australia, Instrumental Climate Records
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