Why is the flu common in the winter, but less common in the summer?

Why is the flu common in the winter, but less common in the summer?
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In climates that experience winter, the influenza virus tends to survive longer and transmit itself better in cold and dry conditions, which leads to more people contracting the flu during those colder months. In climates that do not have a winter season, however, the flu is more common in periods of high humidity and lots of rain. Scientists aren’t sure why that is, but it doesn’t seem to have to do with the immune system being weaker in the winter, contrary to some beliefs.
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