Which part of the world experiences at least 6 months of winter?

The cold parts.
Think further from the equator..

What do you mean by "winter"? Winter weather? What is that?

You need to be sure you have that defined for yourself.

Is this homework?

Your other post asks about the weather in India.

Time to embrace Google, it's your friend.

None, winter is 3 months no matter where you are, Fall is 3 months and so is Spring and Summer.

True enough.. three months each, so Elsie must have some other standard for "winter" in this case.