Obviously it's not ideal weather, but I think people maybe exaggerate how much that matters relative to infrastructure. I haven't heard of any examples in the more southern US (or comparable parts of the world) where they built great infrastructure and people ignored it because of the heat.
People say the same thing about winter in the Northeast. Then when they see how convenient and freeing it is to ride a bike, they quickly learn to deal with the weather.
If you're claiming that they won't, I'll happily be your counterexample. Buying a Brompton and riding 3 miles from the end of public transit to work through pretty much all weather in Boston was about the best thing I did for my sanity in all of 2019. Yes, on the snowy and icy days too.
I did a fair amount of bike commuting in Cleveland as well, though the drive was less hellish and I drove some of the lousier days.
The worst part of moving to Vermont, perversely, is that I get less exercise because it's a 25 mile one-way trip to the shop I work out of.
I mean, no offense, of course some people like you will bike in all weather, but the reality is that a lot of people will not. See this study, and that's for the Netherlands, not NA winter.
I know a lot of people that ride their bikes at work at such temperatures, and one of the biggest issues with doing that isn't the cold - exertion really warms you up - but badly maintained, snowy shoulders and a higher risk of cars crashing into you.
I'm not sure how to convince someone that people stop going outside when the weather sucks. But hey, you've got a New York Times article, so that obviously means my eyes are wrong, right?
I don't know how to convince someone that people stop going outside when the weather gets cold. I thought that was a normal fact of life for everyone who doesn't have an outdoor job.