The cool spell that enveloped Singapore last week was the longest in at least a decade, according to records of the Meteorological Service Singapore (MSS).
Temperatures fell below 24 deg C for five days, from Wednesday to Sunday, because of a monsoon surge that typically would last two to three days.
Coupled with rain, it led many people to don winter wear.
Such extreme weather could happen more often owing to climate change, the MSS spokesman said.
Projections for 2100, made by MSS' Centre for Climate Research Singapore, show that more rain could be produced from the cold surge usually experienced during the current monsoon season.
"This indicates a possibility of more intense surges with higher risk of extreme weather," said its spokesman said.
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