is it just me or the dof måneder sounds like a t?
It does, and that's a common way of pronouncing it.
Ok, takk :)
how do you know år means years as in plural form?
Here, you can tell through context it is probably (although not definitely) plural, but usually grammatical endings on words around it give it away.
Only singular, indefinite nouns are preceded by an article, so it's just like the difference between "deer" and "a deer."
Måneder is pronounced " mont'r "?30May17
So it definitely is pronounced that way? That confused me when entering in my answer