When and how did the term 'Spring' become associated with periods of political liberalization?

As in the Prague Spring or Springtime of the people or lately the Arab Spring. Or in 1989 revolutions which was more like Autumn of Nations. and now A

As in the Prague Spring or Springtime of the people or lately the Arab Spring. Or in 1989 revolutions which was more like 'Autumn of Nations'. and now Arabic Spring is referred to becoming an Islamist Winter? how did seasons become associated with such political movements??

or:As in the Prague Spring or Springtime of the people or lately the Arab Spring. Or in 1989 revolutions which was more like 'Autumn of Nations'. and now Arabic Spring is referred to becoming an Islamist Winter? how did seasons become associated with such political movements??

or:Weather has always been a determining factor in political activities of all types. Nobody throws a protest in cold rainy weather.

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