Answer:
Winter is at a different time depending on where you live. When the Northern half is tilted toward the sun, the Southern half is tilted away from the sun. If you lived in the Southern hemisphere, where Australia is located, your seasons would be reversed. When it is Summer in the U.S., it is Winter in Australia. And when it is Winter in the U.S., it is Summer in Australia. And there are places near the middle of the earth where there are not distinct Summer and Winter seasons.

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Tilted Axis
http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Seasons.shtml
Find out what the earth's tilted axis means for places on earth, including the North and South poles, which receive 6 months of daylight and 6 months of darkness because of the tilt!

Journey North: Reasons for Seasons
http://www.learner.org/jnorth/tm/Reasons.html
Find activities to learn about the earth's tilt and why it causes seasons, and learn about places near the equator where there are not Summer and Winter seasons.