What is es en el otono?

The phrase "es en el otono" is grammatically incorrect in Spanish. It seems like you're trying to say "It is in the autumn."

Here's the correct way to say it in Spanish:

"Es en otoño."

Here's why:

* "Es" means "It is"

* "en" means "in"

* "otoño" means "autumn"

So, the complete phrase "Es en otoño" translates to "It is in autumn."