Singapore is currently experiencing the longest dry spell in at least the last five years, as barely any rain fell on Singapore the last 21 days.

Only 0.2mm of rain has been recorded in the last three weeks or so.

The National Environment Agency defines a period of more than 14 days with less than 1mm of rain as a "dry spell".

Dry spells are common in late January or February during the end of north-east monsoon season.

National water agency PUB has in the past two weeks pumped 80 million to 100 million litres of Newater a day to ensure the water levels at reservoirs don't dip too low due to the dry weather.

This is equivalent to filling at least 36 Olympic-sized swimming pools every 24 hours.

Dead fish at Bishan-Ang Mo Kio Park

The hot and dry weather is also the most likely cause of death of hundreds of fish -- mainly tilapia and mayan cichlids -- found washed up along a river in Bishan-Ang Mo Kio Park on Tuesday.

One fish expert at the National University of Singapore said the dry weather lowered the river's water levels and increased the growth of algae that competed with fish for oxygen.

Such mass deaths are, in fact, not common.

A two-day effort was needed to clean up the decomposing fishes.

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