Which dates are the four different seasons in germany?

Question

summer autumn winter spring? which dates does each season occur?

Answer 1

Spring: 21st of March

Summer: 21st of June

Autumn: 23rd of September (don't ask my why its not the 21st)

Winter: 22nd of December ;)

Answer 2

Actually the beginning of autumn and winter can differ by one day. So autumn is 22nd/23rd of September, winter 21st/22nd of December. Check local calendars for a certain year ;-)