How to get an extreme temperature range between equator and poles without tidal locking

How can I arrange for a planet to have a much greater temperature range between the poles and the equator without it being tidally locked?

Edit: By "much greater" I mean the temperature at the poles in my fictional world should be 20 degree Celsius colder than the poles in our real world. And the temperature at the equator in my fictional world should be 20 degree Celsius warmer than the equator in our real world.

The planet should be very similar to earth, although variations can be made provided the planet is still capable of sustaining human life in the open on at least some parts of its surface. Some details of the oceans, land masses, atmosphere, gravity and orbital parameters can be adjusted within this broad requirement if that helps.

The situation needs to have arisen naturally and no magic is involved.

posted about 7 years ago

Slarty‭

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