La meva amiga prefereix cafè quan fa fred al matí.

In Catalan, possessives are very often used with the definite article:

• la meva amiga = my friend
• literally: the my friend

This is normal Catalan grammar. So unlike English, Catalan usually says:

• el meu llibre = my book
• la meva amiga = my friend

Leaving out the article is usually not correct in this kind of sentence.

Because amiga is the feminine form of friend, and it tells you the friend is female.

• amic = male friend
• amiga = female friend

So:

• La meva amiga = my female friend
• El meu amic = my male friend

Prefereix is the 3rd person singular present tense of preferir:

• preferir = to prefer
• prefereix = he/she/it prefers

Here it matches la meva amiga, so it means:

• La meva amiga prefereix... = My friend prefers...

A few present-tense forms are:

• jo prefereixo = I prefer
• tu prefereixes = you prefer
• ell/ella prefereix = he/she prefers
• nosaltres preferim = we prefer

Because Catalan often does not need a subject pronoun if the subject is already clear.

In this sentence, the subject is explicitly stated:

• La meva amiga = my friend

So there is no need to add ella.

You could say Ella prefereix cafè..., but that would only be needed if you wanted extra emphasis or contrast.

Here cafè is being used as a general noun, so Catalan can leave out the article.

• prefereix cafè = prefers coffee

This is natural when talking about a drink or substance in a broad, non-specific way.

If you say prefereix el cafè, that can also be possible in some contexts, but it may sound more like:

• she prefers coffee as a category
• or she prefers the coffee in a more specific contrastive sense

So in this sentence, cafè without an article is a natural choice.

Literally, it means when it makes cold, but in natural English it means:

• when it is cold

This is a very common weather expression in Catalan:

• fa fred = it is cold
• fa calor = it is hot
• fa sol = it is sunny
• fa vent = it is windy

So quan fa fred simply means when it’s cold.

Catalan often uses the verb fer in weather expressions.

• fer usually means to do or to make
• but in weather phrases it works like it is in English

Examples:

• Fa fred = It’s cold
• Fa calor = It’s hot
• Fa bon temps = The weather is nice

So this is something you usually just learn as a fixed pattern.

Al matí means in the morning.

It is made from:

• a
  • el = al

So:

• el matí = the morning
• al matí = in the morning / in the morning time

This contraction is very common in Catalan:

• a + el = al
• de + el = del

For example:

• al cotxe = to the car / in the car, depending on context
• del llibre = of the book / from the book

It most naturally goes with the idea of time in the whole situation: the preference happens in the morning, specifically when it is cold then.

So the sentence is understood as something like:

• My friend prefers coffee when it’s cold in the morning
• or My friend prefers coffee on cold mornings

In real usage, time expressions like al matí can sometimes feel slightly flexible, but here the overall meaning is clear.

Yes. Catalan word order is fairly flexible, especially with time clauses.

The original sentence is:

• La meva amiga prefereix cafè quan fa fred al matí.

You could also say:

• Quan fa fred al matí, la meva amiga prefereix cafè.

This puts more emphasis on the time/condition first:

• When it’s cold in the morning, my friend prefers coffee.

Both are grammatical.

The accent in cafè shows where the stress falls and that the vowel is è, an open e sound.

• cafè is stressed on the last syllable: ca-FÈ

Without the accent, the stress rules would suggest a different pronunciation, so the accent is important.

A rough English-friendly pronunciation is:

• cafè ≈ kah-FEH

The final è is not silent.

A rough pronunciation is:

• pre-fe-REIX

In many accents, the ending -eix sounds roughly like -aysh or -esh, depending on the variety.

The important part for a learner is that:

• the stress is near the end
• the final x here sounds like sh

So prefereix is approximately:

• preh-feh-RAYSH or preh-feh-RESH

The exact sound varies a bit by dialect, but the spelling pattern -eix is very common in Catalan verbs.

By default, it sounds like a general habit or preference.

• La meva amiga prefereix cafè quan fa fred al matí.
• My friend prefers coffee when it’s cold in the morning.

Because the verb is in the present tense and there is no special context making it a one-time event, a learner would normally understand this as something she generally tends to do.

If you wanted a one-time past event, you would use a past tense instead.