Assuming the axial tilt of the Earth was increased to roughly 30°, and the orbital eccentricity roughly doubled(0.03 as opposed to 0.016) so that the average temperature stayed the same, but the summers became hotter, the winters colder and the seasonal changes from latitude became more extreme, what kind of weather differences could be expected?

I'm building a world that is very Earthlike other than the changes mentioned above and I'm having trouble figuring out how it would affect the weather on the planet. I know that the seasonal extremes would cause more severe storms, maybe even the theoretical hypercanes, but I am not very well versed in meteorology, let alone climate models for an entire planet.

I've seen plenty of questions about the planet having no axial tilt, but mot a ton about a slightly higher tilt.

I did find several Quora answers that are almost exactly what I was asking: https://www.quora.com/If-the-Earths-axial-tilt-increased-to-30-degrees-what-effects-would-it-have-on-Earths-climate-zones

The only problem is that there is almost no talk of how weather would be affected, as most of the answers are about how it would affect Earth.

All I'm really looking for is the expected changes to the yearly weather. Would there be increased rainfall in the summer? Why's that? Would the northern winters be non-stop blizzards? No? Alright. Just a basic rundown.

Any help or advice on where to start looking would be appreciated.

P.S. I understand that weather is an incredibly unpredictable and complicated subject, and that I'm making a highly theoretical model here, so perhaps just some guesses based on the fact that summers are warmer, winters are colder and the poles experience more intense variations.


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    $\begingroup$ Note in an eccentric orbit a planet will be moving fastest at perihelion (closest point to the sun) and slowest at aphelion (furthest point) so on average it will spend more time further from the sun than you would expect by doubling the eccentricity. Also note that the southern hemisphere suffers more extreme climatic variation than the northern hemisphere in part because perihelion occurs during the southern summer and aphelion during the southern winter. $\endgroup$ – Slarty May 11 '20 at 17:23
  • $\begingroup$ Very good points, so the planet will likely be cooler than Earth, and the southern hemisphere will likely see a hotter and dryer climate. Thanks for the info! $\endgroup$ – Jack Foisy May 11 '20 at 17:37
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    $\begingroup$ The main problem with this question is that it is not well defined. Indeed, "how weather would be affected" is meaningless. How will it be affected where? Southern England? Northern Kazakhstan? Nizhny Novgorod? Melbourne? How it will be affected when? The climate and the biosphere are interdependent; since Earth presumably has had this 30° axial tilt since the beginning of life, it follows that natural evolution would have taken a different path. Moreover, the system is known to be chaotic. There is no such thing as long-term stability in Earth's climate. $\endgroup$ – AlexP May 11 '20 at 19:01
  • $\begingroup$ I'll try to clarify better and make the question more brief, but it's really a question of change in the climate zones and general weather that may be expected. Like if the tropics would be wetter or if the poles would get colder $\endgroup$ – Jack Foisy May 12 '20 at 0:19
  • $\begingroup$ There would be LOTS of wind, assuming that seasons would be opposite in different hemispheres. Extreme heat on one side, and extreme cold on the other, where the atmospheres combine, it would cause continual wind through the globe. It is also possible that glaicers would melt during summers. $\endgroup$ – bean delivery man Sep 6 '20 at 14:59

Cooler than Earth yes, but the Southern hemisphere would tend to experience very warm summers and very cold winters to an even greater extent than our southern hemisphere already experiences.


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