Weather and climate during the next Ice Age

I have a short story series, it is set thousands of years in the future during the next ice age. Humanity and their governments reside along the equator and in parts of the Southern Hemisphere.

Brazil, South Africa & Australia being the biggest superpowers in a global government. This is a thousand years or so after wars, famine and food shortages you'd expect with limited resources. Mankind has recovered and advanced enough to carry out archaeology expeditions in the northern hemisphere to document the past and find artifacts.

The reason I bring this up is because, I have an outpost stationed in what used to be St. Louis.

Glaciers run through Oregon, northern Idaho, Wyoming, Nebraska and stretch to the East Coast.

How would these massive glaciers built up over thousands of years affect the regions bordering them in terms of climate and weather?

I am curious about the regions bordering the glaciers across the US, but if necessary focus on the outpost in St. Louis.

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Weather and climate during the next Ice Age

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