New York is mentioned in the show, so it can't be. From MOSB:
Quote
Lois (agitated)
But why only Metropolis? It's twelve degrees in New York, there's eight inches of snow in Chicago and we're having a run on sunblock.
LabRat
Athos: If you'd told us what you were doing, we might have been able to plan this properly. Aramis: Yes, sorry. Athos: No, no, by all means, let's keep things suicidal.