We call it snow removal...whether by plow, shovel, snowblower, etc. Then we use salt and sometimes sand to increase traction. If you are unable to do these things, people often pay for these services. After that, carry on as if there was no snow...and don't go out in a snow storm.

@AlexP of course, the blue in Michigan is downwind of Lake Michigan indicating more precipitation, and as you go further inland it becomes green. Most of the green areas are upwind of a lake with blue on the other side. The dark blue south of Watertown NY is a combination of the lake effect and the elevation increase. The only surprise on this map is the green near Rochester in the Genesee River Valley.

As far as its localized direction, in this area the cold front is typically followed by a high pressure that moves down below the lakes, pulling the cold air in a NE, E, SE, or sometimes South direction, so you get sort of an easterly wedge of precipitation as the high pressure moves through changing the wind direction. Since you are in the southern hemisphere, the high pressure spins the opposite, but the jet stream still goes W->E, so idk how much that would affect it.

Ironically, the map AlexP posted seems to indicate a clear difference in precipitation in Michigan on the half downwind from the lake, but the usclimatedata website doesn't show any sort of seasonal changes like it does in New York.

if you look at a city at the tail end of the lakes, down wind, there is Oswego NY by the lake and you can see the different between precipitation in lake effect season and other months. Rome NY is further inland and there is even more precipitation. Though, as you get closer to the ocean, the data is affected by that with more summer rains.

freezing point of oxygen is 54K, you would essentially create a vacuum and nothing would combust. Then there is the obvious death of the people controlling the vehicles which renders the vehicle useless anyway unless they are remote controlled.

are insects available? There are many insects that can be used to generate various types of silk.

Since this worldbuilding...how many works exist out there that are just like this? Highlander comes to mind.

I wouldn't say Education is the issue, I know some very large college educated families. It's not education that is causing this.

@John Using South Korea as a model, the second generation is < 50% the size of the first, and the third is < 25% the size of the first, the fourth is < 12%.

Just have a mild virus that causes infertility. By the time anyone knows there is a connection, it's already spread through the world several times. The process would take a few generations for everyone to die off though.