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.
It means "in what season is the month". Probably better to use "ser" here. "en que estación es el mes?"
"En qué estación estamos" translates to "What season are we in?" in English. It is used to ask about the current season of the year, such as spring, summer, fall, or winter.
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.