I know this is a joke but as a Minnesotan I think right around -15°F (-26°c) is where it starts to get 'cold'. This is where the air really begins to sting your face and people have issues starting their vehicles.
am a native and lived there most my life. only had problems with my piece-of-shit cars when it got colder than -20F or so. block heater (on a timer) and a newish-battery and they always started, though, even during that record cold snap (-60F).
🤔 🤣... ummm... i've drank wine half frozen wine from a cup at -30C 🤣... not fun, but it kept us warm that night 🤣. too bad we didn't have vodka at 3AM 🤣.
I think we drank like 10L of wine that night 🤣. Vodka would've been more efficient 🤣.