Issued on 6 July 2012

A dry start to winter for the Riverina, relief for western WA

Near-average June rainfall along the coast of southwest Western Australia has removed short-term rainfall deficiencies which had resulted from a drier-than-average autumn. Elsewhere, June rainfall was mixed; also generally above average across Queensland and the southeast mainland coast, and below average for parts of inland Australia.

3-month rainfall deficiencies

Following below-average rainfall over most of southern Australia in April and May, continued dry conditions during June for inland Australia have seen short-term rainfall deficiencies persist in the Interior of Western Australia, while severe 3-month (April to June 2012) deficiencies have emerged north of Esperance and in south-western New South Wales and the Riverina and adjacent parts of northern Victoria.

Despite the relief of short-term deficiencies, long-term rainfall deficiencies remain in southwest Western Australia. The southwest region had its driest year on record in 2010, and the two-year period from 2010 to 2011 was the lowest on record in some parts of southwest Western Australia.

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Definitions

Lowest on record - lowest in the historical analysis, which runs from 1900.
Severe deficiency - rainfalls in the lowest 5% of historical totals.
Serious deficiency - rainfalls in the lowest 10% of historical totals, but not in the lowest 5%.

Very much below average - rainfalls in the lowest 10% of historical totals.
Below average - rainfalls in the lowest 30% of historical totals, but not in the lowest 10%.
Average - rainfalls in the middle 40% of historical totals.
Above average - rainfalls in the highest 30% of historical totals, but not in the highest 10%.
Very much above average - rainfalls in the highest 10% of historical totals.

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