This is the 13892nd most frequent Swedish word.
åskag
It seems "åskag" may not be a valid Swedish word; perhaps you mean "åska," which translates to "thunder."
Here, 'åskan' refers to the natural phenomenon of thunder.
Under stormen hördes åskan rulla över himlen.
During the storm, the thunder was heard rolling across the sky.
In this sentence, 'åskan' is used to express the fear of the thunderous sounds during a storm.
Barnen berättade att de varit rädda för åskan.
The children said that they had been afraid of the thunder.
This context establishes 'åskan' as an atmospheric event observable in different seasons.