Quan neva a la muntanya, hi ha neu més dies que al poble.

Because quan means when, and here it has the sense of whenever.

So Quan neva a la muntanya... means something like:

• When/Whenever it snows in the mountains...

If you used si, it would mean if, which sounds more conditional and less like a general repeated fact.

Catalan does not need a dummy subject like English it in weather expressions.

So:

• neva = it snows / it is snowing

The verb nevar already gives the whole idea. English needs it, but Catalan does not.

The present tense is used here for a general truth or habitual situation.

The sentence is not about one specific moment. It means something like:

• this is what usually happens
• this is the normal pattern

So the present tense is the natural choice in Catalan, just as it often is in English.

Literally, a la muntanya is at/in the mountain, but idiomatically it often means:

• in the mountains
• up in the mountains
• in the mountain area

Catalan often uses singular la muntanya in a broad, generic way where English may prefer the mountains.

Also, remember that a can mean at/in as well as to, depending on context.

Hi ha is the standard Catalan way to say:

• there is
• there are

So:

• hi ha neu = there is snow

It is best learned as a fixed expression.

Historically, hi is a locative element, but for learners the important thing is that hi ha functions together as the normal existential expression:

• hi ha = there is / there are

In other words, don’t try to translate hi separately every time. In this structure, it is part of the standard expression.

Because neu is a mass noun, like snow in English.

When Catalan talks about the presence of something in a general way, it often uses the noun without an article:

• hi ha neu = there is snow

Using la neu would usually make it sound more specific or refer to snow as a known thing.

Literally it means more days.

In this sentence, the natural meaning is:

• for more days
• or sometimes on more days, depending on context

So the idea is that snow remains or is present for a longer number of days in the mountains than in the village.

Catalan often leaves out words like durant or per when the meaning is already clear.

So:

• hi ha neu més dies

can naturally mean:

• there is snow for more days

Even though English often needs for, Catalan can express the idea without it here.

After més, Catalan uses que to mean than.

So:

• més dies que al poble = more days than in the village

This is the normal comparative pattern:

• més ... que = more ... than

Al is the contraction of:

• a + el = al

So:

• al poble = in/at the village or in/at the town

This contraction is required in normal Catalan.

Because Catalan often uses a for location with places where English uses in or at.

So:

• al poble does not mean to the village here
• it means in the village / at the village

The exact English preposition depends on context, but the Catalan a is completely normal.

Yes. Catalan often omits repeated material in comparisons.

The sentence does not repeat the whole idea after que because it is already understood from the first part.

That is very similar to English:

• there is snow for more days than in the village

We do not repeat the full clause in English either.

It can mean either, depending on context.

Common possibilities are:

• village
• small town
• sometimes simply town

So the best English choice depends on what kind of place the speaker is talking about.