How hot
The last heatwave was in April 2016, the hottest year recorded, with an annual mean temperature of 28.4 deg C.
Singapore experienced, on average, one to two heatwaves per decade.
A heatwave in Singapore is defined as three consecutive days when daily maximum temperatures are at least 35 deg C. The daily mean temperature during the period should be at least 29 deg C.
Cause
Singapore does not have large-scale high pressure systems, but localised systems can still produce heatwaves, said Prof Wang.
The 2016 heatwave was due to a natural climate phenomenon called El Nino, which brings warm and dry conditions.
More frequent and extended heatwaves with higher extreme temperatures are expected to hit South-east Asia as the world warms, said director Benjamin Horton of Nanyang Technological University’s Earth Observatory of Singapore.
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