How could humans survive 9 month winters in the classical Roman era?

I have a world I am building that is similar to ours, and is set in the height of the Roman empire era. The main difference is that the winter is half the year and full rotation of seasons is 18 months:

The winter looks like the one in northern USA/ southern Canada: heavy on and off snowfall, and mostly freezing temperatures for the majority of the season.

What would society have to be like to survive this type of world? Would this level of society be able to store enough food for these long winters?

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How could humans survive 9 month winters in the classical Roman era?

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