Aha this. :D But was this also in pre-christian era? I suppose we can assume. In that case it depends on region but most widespread are these names which support my thesis that there are certain agricultural traits that defined certain part of year;

Correct. Some of the names are most definitely Proto-Slavic. They are applied to various months in the different local variants, because the original Slavic calendar was lunar, as even the word for month suggests, and as such it was not very fixated or especially correct astronomically.
There are numerous local variations in Slavic month nomenclature. More or less full list:



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