Think of these expressions as little formulas or set expressions. Ever take algrebra in school? Don't fight it or you'll give yourself a headache. So... llueve = it is raining. nieva = it is snowing. and... what time is it? = ¿qué hora es? what's the weather like? = ¿qué tiempo hace?
I wrote "snowing or raining". DL didn't accept. I 'm guessing because it's in the form of a question I should have included "Is it..."
The verbs are Nevar - to snow, and llover - to rain. But they are special; as you wouldn't say "I snow" for example! :-)
Nieva and llueve are both verbs. They're conjugates of "to snow" and "to rain" respectively.
Nope,it wouldbe as Duolingo says because it's a question of whether it is raining or snowing, and if you go to the right form of questions in english, then you have to go with the whole thing