@alanmichael1 Could you re-test this as well ?
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December - last edited December
Today is my lucky day! Accidentally my game was also one day before winter so I could test autumn and winter with two different indoor pool lots.
The bug remains as it was:
Autumn: NPCs visit pool lot but don't swim when temperatures are cold (I think I saw them swimming with warm temperatures in recent weeks).
Winter: Nobody visits pool lot EXCEPT clubs that have pools as default location. But also the club members don't swim, even if swimming is a club action.
Interestingly, using a thermostat for heating doesn't solve this issue.