Meteorologists do those graphs. What do you expect. Having set through more than one lecture by NOAA person for certification as a weather watch person as a firefighter. They love graphs and photos of clouds. Sooooo many photos of clouds…
Still, they are easy enough to read once you get used to them.
The issue isn’t “I don’t want to be cold.” The problem is when it’s below 20F/-7C, you need to wait long enough for the coolant to warm enough to evaporate the moisture in the defrost vents and the inside of the windshield. Otherwise the inside of the windshield frosts over and you can’t see well enough to drive safely. And the colder it gets, the longer it takes.
Do you need remote start? Nope. I don’t have it on my vehicles. But you will need to wait long enough to keep the windshield defrosted.