Estimated average number of individuals by week based on eBird data, Jul 2012 to Jun 2022
Oct 29-Nov 04
22 Jul 2017
20 May 1989
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A fixture at raptor migration hotspots in Oct and Nov. With some effort (and very good photos), you may be able to pick out a Cook's Swift, which has not yet been recorded in Singapore as of Sep 2022.