[Peak Season vs. Off-Season] Are there any industries with almost no difference?

My business is one where things are dead in the summer,
but the number of customers increases about fivefold in the winter.
On the other hand, I imagine businesses like swimming pools or shaved ice shops
would only have many customers in the summer,
and I've heard that accountants and tax accountants
are busy at the end of the year.
Are there any industries where this kind of seasonal or date-specific
workload concentration is almost non-existent or very minimal?