Earth-type planet in all aspects but...?

Question

... axis of rotation is perpendicular to plane of revolution around its sun at "North Pole" and "South Pole" mid-summer. What would weather be like?

Clarification- (I hope) RE: Revolution, at 0 deg the North Pole is pointed directly at the sun. At 90 deg, the Equator is edge-on to the sun. At 180 deg, the South Pole is pointed directly at the sun and at 270 deg the Equator is again edge-on to the sun.

Helpful?

Answer 1

I think what you mean is axis of rotation is co-planar or co-linear with plane of orbit. This would produce very exteme seasons, as you might expect. Winter temps would approach those on Pluto, whereas summer temps would probably be higher than the boiling point of water. That would cause all of the oceans to dry up in the summer hemisphere and simultaneously deposit as ice onto the opposite hemisphere, thousands of feet thick. Even the Oxygen and Nitrogen in the atmosphere might freeze out. Spring and fall would be transition periods of high melting and torrential floods. What a planet!

Answer 2

Wild!

Everywhere on the earth would have Midnight Sun and everywhere on earth would have six months of night. The Tropic of Cancer would be the North Pole, the Tropic of Capricornus would be the South Pole, and both the Arctic and Antarctic Circles would be the Equator.

In summer the North Pole gets 24 hours of directly overhead sun, while the South Pole cools off to many degrees below zero. This causes the cold air at the South Pole to sink and spread towards the Northern hemisphere, and the hot air at the North Pole to rise and head towards the South. So everywhere on Earth would have constant hurricane force or greater winds from the south. As the months progress, this pattern violently changes and eventually reverses as the North Pole chills and the South Pole roasts.

Be glad we don't live on such a world. There is a known world something like this - Uranus. When Voyager flew by it in 1986, they found a completely featureless world, but now it's showing some features. The axial tilt of 98 degrees may be the reason.

Answer 3

There wouldn't be any difference. What causes the seasons is the oscillating shift in the earths rotation, that's why summer in the northern hemisphere is winter in the southern. as far as the weather goes, it has nothing to do with the geometry of the axis of rotation in relation to the sun that I can see. The weather should be earth like if the wobble existed in it's rotation too. C.
by the way,, a rotation you describe would soon change the poles to the AXIS of rotation,, as they are cold because they don't get much sunlight, the magnetic poles also follow the axis of rotation. Maybe such a planet exists,, but it's rotation would have to be a product of a giant collision in it's past, as the rotation is formed as the matter acreates into a solid body. C.

Answer 4

Perpendicular, as opposed to our 23-some degree tilt? I don't think there'd be any seasons, just climate zones of constantly cool weather near the poles and warm at the equator.