The official calendar seasons are around the 21st of March, June, September, and December, give or take a day for the lunar cycle. The unofficial seasons in the US at least start are early March, Memorial Day (Last Monday in May) Labor Day (first Monday in September), and Just after Thanksgiving (4th Thursday in November), The weather varies from location to location. Northern US will still have snow while the south has flowers blooming. And Illinois does whatever it wants. We've had snow in Mid May and mid 60s (around 18c) in December.

As for when Poser 12 comes out, that should be when it's ready. Better to wait a little longer and have it work well than to have a buggy mess come out early.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10