According to that data NY has tested almost 1% of their population while Texas has tested only 0.1% of theirs. But even if we look only at hospitalizations as you’ve suggested could it be that you’re incorrectly attributing the slower rates to temperature rather than population density? The colder cities in the US are the older cities where people live very closely together. States like Texas have a certain degree of “social distancing” already baked in. Using the drive thru and avoiding the subway and elevators isn’t really a drastic change for Texas. It’s basically impossible for much of New York.