Srila Bhaktisiddhanta Sarasvati Goswami Thakura is quoted as citing sastra thus:
tad-dinam durdinam manye meghachhanam na durdinam,
yad-dinam krsna samlapa katha piyusa varjitam
A cloudy day is not inauspicious, but a day devoid of discussing krsna-katha is actually inauspicious.
