"Sierpień to miesiąc lata."

Translation: August is a month of summer.

[MaryAnn314963]

Why lata and not lato?

[alik1989]

Lato has to be in the genitive case to indicate possession or affiliation. That's exactly what the English "of" does here.

[summer_p]

For the April/Spring variant "in the [season]" was accepted but here it is not. Just wondering why that was?

[Jellei]

Okay, 'a month in summer' is going to be accepted now.