The queues (in America they call them 'lines') for the Empire State are very long on a clear day. However, tickets are valid any day so if you pass by on a cloudy day when there are little or no queues pop in to buy tickets for use later in your trip. This should save about 20-30 minutes queue time when you want to go up on a clear day.

Empire state building - 5th Avenue at 34th

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