This challenge has to do with why it gets warmer during the summer.
Many people think it's because Earth is closer to the Sun.
In fact, this is only true if you live south of the equator. Obviously, the Sun is what keeps us warm. If you're a careful observer and you have about two weeks to wait, you can discover the reason for the seasons yourself. A schoolyard or an open field works best. Then get your piece of graph paper and make a chart with three columns.