Days without a bridge failure: 
Temperatures in NYC have reached their highest point so far this year, with Central Park reading 95°F (35°C) yesterday. This will be the 5th straight day with temperatures above 90°F (32.2°C). New York City sees 15 days reach 90°F (32.2°C) per year on average.
I am a geologist actually and just to be clear that’s definitely not what happened. The only things I can imagine actually happened to cause this were lack of maintenance resulting in rust, which expands and as a result can lock the bridge up. Also bare metal in the sun can get much hotter than air temperature, so the bridge was probably significantly warmer than the air which resulted in greater thermal expansion