If it is in the northern hemisphere, then it must be in the southern hemisphere.

summer - winter... or vice versa

Explanation:

The seasons on the two opposite hemispheres are opposite to each other. When the Northern Hemisphere experiences summer, the Southern experiences winter, and when the Norther Hemisphere experiences winter, the Southern Hemisphere experiences summer. The reason why the seasons are opposite on the two hemispheres is the tilting of the Earth. In one part of the year, the tilting of the Earth exposes the Northern Hemisphere more to the sun, thus it is heated more and it it summer there, while the Southern Hemisphere is tilted away from the sun, so it receives less heat, so it is winter there. The opposite happens in the other part of the year, as the Southern Hemisphere is the one that is more exposed to the sun and experiences summer, while the Northern Hemisphere is tilted away from the sun so it experiences winter.