In what season/part of the year is (your) birthday
in what station is it.
It means, "What season is December in?"
In what season is it very cold?
It means "What day is the birthday".
In what season do you like to swim?
what station are we on during the forecast
¿En que estacion hace frio? means: In what season is it cold?
As a translation: What season are we in? As an answer: Estamos en la primavera.
This means "On what station is your birthday?" in Spanish. It seems there might be a typo or mistranslation in the phrase "de tu compleanos," as it should be "¿En qué estación es tu cumpleaños?" to inquire about the date or time of someone's birthday.
The translation of "en que estacion esta el mes" from Spanish to English is "in what season is the month."
In the space station
It seems incomplete: as 'En que (mes/ano) es la (fecha) de tu cumpleanos', it would mean 'In what (month/year) is the (date) of your birthday?' The words in brackets are suggested possibilities.