This is the 828th most frequent Swedish word.
sommarens
"Sommarens" means "the summer's" or "of the summer" in English.
'Sommarens' here acts as a possessive form, indicating that the heat belongs to or is associated with the summer.
Sommarens värme var mycket hög i år.
The heat of the summer was very high this year.
In this context, 'sommarens' describes the characteristic of scents being specific to the summer.
Jag älskar sommarens friska dofter på landet.
I love the fresh scents of the summer in the countryside.
'Sommarens' in this usage refers to the flowers that bloom during the summer season.