What information about a fictional world is unnecessary?
I was able to gain some insight already thanks to How much detail is too much?, but I still need a more precise answer, because my details aren't bound to a particular scene.
I was searching for some information on tidally locked planets (my setting for the story) and while looking at the questions over at World Building SE I noticed that people had chosen specifical temperatures, days per year, etc, whereas I never even thought about building the world so precisely. I did think about the key elements of such a place (wind, no day-night, temperature), but I didn't choose a year cicle being 33 days long or something.
My story is a fantasy, with magic and weird creatures, so it doesn't have to be completely scientific, but I still want a world that is believable. I thought it didn't really add anything of value to the story if a place is -25°C or -30°C, it should be clear that it's pretty cold, that's it.
Am I mistaking? Is it better to explain a setting meticulously or stick to the main elements to make the setting more believable?