Simultaneous droughts and heatwaves across Australia's grain-growing regions have intensified sharply since the 2000s, and researchers have now linked these compounding climate extremes to measurable drops in wheat and barley yields — particularly in Victoria, Tasmania, and New South Wales.
1
The frequency, severity, and geographic spread of combined drought-heatwave events increased sharply after 2000, with hotspots in western and eastern Australia during August–February.
2
Statistically significant negative correlations were found between these compound events and crop yields, including wheat and barley in Southern and Eastern Victoria (r = −0.49 and −0.45 respectively) and Central North Victorian barley (r = −0.41).
3
Several major yield decline years since 2003 aligned directly with periods of high compound drought-heatwave frequency and severity across Australian cereal-growing regions.
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