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The earth is tilted at 23.5 degrees on its axis. As it goes round the sun in 365 days the hemisphere that is tilted towards the sun gets more sun and gets hotter, hence summer. The hemisphere that gets less sun gets colder and has winter. That's not going to change for millions of years. But within the nature of the seasons there's a huge amount of variability for what the weather does each year.
One weird thing is that plants and animals seem to know the seasons regardless of the weather. My apple trees looked dead then sprung to life when it was still pretty chilly. Birds seem to migrate at the time of year not the weather. Many aquatic creatures have seasonal cycles of migration and reproduction. I don't think the oceans change so much between seasons - so I wonder if they sense something else.
It's the length of the days that trigger the plants and other animals to do their seasonal things. Deciduous trees will lose their leaves as the days get shorter regardless of the actual temperature at the time.








