"Cool it" can refer to either the standard English use (instruction to chill) or the colloquial which indicates that someone should calm down or otherwise refrain from an argument. Example sentences...
Snow in New York City during the summer would be an anomaly.
Yes-- The woman was ailing due to her serious illness and the tragedies of days past.
My old friend Alfred was being uncharacteristically hostile toward me.
The long storm was a very bad omen.