Would a temperate "land of the midnight sun" be habitable?

This is another question about PommeDeTerra:

Thanks to the orientation and position of the planet, PommeDeTerra has a habitable island with a temperate climate at it's south pole that looks a little like this:

This island is very similar to Europe with the same soil types, geographical formations, flora, and wildlife. The planet has no tilt on its rotation axis, so the sun never sets and seems to fly in circles along the horizon. (I'm not interested in the effects of this in this question.)

It has become evident that having having no tilt on the rotation axis is a very bad idea. Due to this, I have decided to give it an earth-like rotation axis. This may cause some massive changes to the conditions that my TemperateAntarctic-PommeDeTerrans live in, but what are they?

First of all, we now have a continent which has permanent sun in summer, and full darkness in winter. The average yearly temperate is the same as, say, Germany or France, but due to the sunlight changes it will have hot summers and cold winters.

My question is: How hot and how cold? Will the island still be habitable?

I would like to know:

What will the climate be like and what types of weather should I expect in summer and winter? I'm particularly interested in how the plantlife and temperature will be affected by the several months straight of sunlight and darkness each year.

I'm not too bothered about the rest of the world (it can be inhospitable desert if needed), I just want to acheive a temperate(ish) climate at the poles.

posted over 6 years ago

Aric‭

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