Answer:
The weather in New York City is capricious, especially in the springtime, with beach weather one day, and freezing rain the next.
His girlfriend's capricious lifestyle annoys him to no end, as he is very set in his ways and hates any sort of change or inconsistency.
Her schedule was completely capricious, so the only way someone could have known she'd be in that cafe at that time is if they followed her.
Clearly he had not planned any of the robberies more than a few minutes in advance, and the police could not figure out how such a capricious criminal could manage to keep from getting caught.
Carolyn capriciously decided two days before her wedding that she wanted her bridesmaids to wear red instead of blue and the flowers should all be pink instead of yellow.