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Here is a graph of the average temperatures in Montreal, Canada, in the Northern Hemisphere, Quito, Ecuador, which as the name suggests, is almost on the equator, and Melbourne, Australia, in the Southern Hemisphere.

You should notice a few things:
1) When it is hot in Montreal, it is cold in Melbourne, and vice versa.
2) The temperature at each location shows a predictable, yearly cycle
3) Quito is more or less the same temperature all year round

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From https://www.worldweatheronline.com/