It is thought that the eventuality of a nuclear war would likely entail large areas of the northern hemisphere to experience sub-zero temperatures for several months, regardless of the season.

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This phenomenon, often referred to as "nuclear winter," is a theory suggesting that the smoke and soot from widespread fires after a nuclear war would enter the atmosphere and significantly block sunlight, leading to drastically lower temperatures worldwide, particularly in the northern hemisphere where most nuclear targets are located.

It Is Thought That the Eventuality of a Nuclear War