What are environmental factors behind 'feels like' temperatures

INSUBCONTINENT EXCLUSIVE:
A volunteer showers a woman with water during a heatwave in Karachi
— AFP/FileMeteorologists outlined the science behind varying actual and 'feels like' temperatures as Karachiites braced for a cycle of
heatwaves amid predictions of high mercury hovering between 35°C and 37°C which...
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This first appeared/also appeared in The News (Pakistan)