Jet streams change position, location, and strength depending on the season. In the winter, areas in the Northern Hemisphere may get colder than in other periods as the jet stream dips "lower," bringing cold air in from the polar regions.
The jet stream shifts north and south seasonally; because there is less cold air, it retreats northward into Canada during the northern hemisphere's summer
The answer to the question is Australia. It is in the southeast region of the Earth. It is the largest country in Oceania. It is the answer to the question.