Anything below 10°F is actively dangerous. Anything above 110°F is actively dangerous.
NYC barely ever reaches 0°F according to this site:
https://www.extremeweatherwatch.com/cities/new-york/lowest-temperatures-by-year
Seriously, NYC is closer to having regular 100°F weather than 0°F and it is in the Northern US!
In other terms: -18°C is extremely fucking cold, 38°C is just regular hot.