Kasım serin olunca kışlık kıyafetleri tekrar çıkarıyoruz.

Olunca comes from the verb olmak (to be / to become / to happen) plus the suffix -ınca / -ince / -unca / -ünce, which often means when, once, or as soon as.

So:

• olmak = to become / to be
• olunca = when it becomes / once it is

In Kasım serin olunca, the idea is:

• serin olmak = to be cool
• serin olunca = when it gets cool

So the whole first part means something like when November gets cool or once November turns cool.

Turkish usually needs a verbal form to connect this kind of clause naturally.
Here, serin is an adjective meaning cool, and olmak is used to express becoming or being in that state.

• serin = cool
• serin olmak = to be / become cool
• serin olunca = when it becomes cool

This is very natural in Turkish. English might say when November is cool or when it gets cool in November, but Turkish often uses olmak in this kind of structure.

Kasım means November. Here it works as the topic/time frame of the sentence.

In Kasım serin olunca, the sense is not exactly in November as a simple date expression. It is more like:

• when November becomes cool
• when the weather in November turns cool

So Kasım appears in its basic form, with no case ending.

A learner might expect something like Kasımda (in November), but that would create a slightly different structure.
This sentence is built around the clause Kasım serin olunca = when November gets cool.

Kışlık comes from kış (winter) plus -lık, a very common suffix that can create meanings like for, related to, or suitable for something.

So:

• kış = winter
• kışlık = for winter / winter-type / winter-use

Therefore:

• kışlık kıyafetler = winter clothes
• more literally, clothes for winter

This suffix appears in many similar words:

• yazlık = for summer / summer house / summer clothes, depending on context
• günlük = daily / diary
• tuzluk = salt shaker

Here kıyafetleri is the definite direct object, so it takes the accusative ending.

Breakdown:

• kıyafet = clothing item / outfit / clothes
• kıyafetler = clothes
• kıyafetleri = the clothes

In this sentence, the speaker means specific clothes that both speaker and listener can identify: the winter clothes.

So:

• kışlık kıyafetler = winter clothes, in a more general sense
• kışlık kıyafetleri = the winter clothes, a specific set

Because çıkarmak is acting on a definite object here, Turkish uses the accusative.

Yes. Kıyafetleri is one of those Turkish forms that can be ambiguous out of context.

It can mean:

• the clothes
  (kıyafetler + accusative -i)

or

• his/her clothes
  (kıyafet + plural/possessive-related form depending on context)

But in this sentence, the meaning is clearly the clothes, because it is the direct object of çıkarıyoruz and fits the meaning we take out the winter clothes again.

Context usually makes the meaning clear.

The verb çıkarmak can mean several things, including:

• to take out
• to remove
• to take off (clothes, glasses, etc.)

Here, because the object is winter clothes and because of the seasonal context, it means to take out or to bring out, probably from storage.

So in this sentence:

• kışlık kıyafetleri tekrar çıkarıyoruz = we take the winter clothes out again

Not we take off the winter clothes again.

Context is what tells you which meaning of çıkarmak is intended.

Literally, çıkarıyoruz is the present continuous form:

• çıkar- = take out
• -ıyor- = present continuous marker
• -uz = we

So word-for-word it looks like we are taking out.

But in Turkish, the present continuous is often used more broadly than in English. It can describe:

• what is happening now
• habitual actions
• repeated seasonal actions
• planned or typical behavior

Here it sounds like a general repeated action:

• When November gets cool, we take out the winter clothes again.

So even though the form is present continuous, the natural English translation is not necessarily we are taking out.

Tekrar means again.

It tells us that this is something repeated, probably every year:

• tekrar çıkarıyoruz = we take out again

Its position before the verb is very natural in Turkish. Turkish adverbs often appear before the verb they modify.

So:

• kışlık kıyafetleri tekrar çıkarıyoruz
  = we take out the winter clothes again

No, Turkish word order is flexible, although some orders sound more natural than others.

This sentence uses a very natural order:

• Kasım serin olunca = when November gets cool
• kışlık kıyafetleri = the winter clothes
• tekrar = again
• çıkarıyoruz = we take out

The verb usually comes at the end in neutral Turkish.
So this sentence follows a common pattern: time clause + object + adverb + verb.

You could rearrange some parts for emphasis, but the given version is smooth and standard.

Yes, that is a very natural English interpretation.

Even though the Turkish literally mentions Kasım as the subject of the first clause, English often prefers to say:

• When it gets cool in November...
• Once November turns cool...
• When November gets chilly...

All of these capture the idea well.
The Turkish is concise and natural, and English may need slightly different phrasing to sound equally natural.

Because Turkish often expresses when through a suffix rather than a separate word.

In English:

• when November gets cool

In Turkish:

• Kasım serin olunca

The -ınca / -ince / -unca / -ünce part already carries the idea of when / once / as soon as.

This is a common feature of Turkish: meanings that English expresses with separate words are often expressed by suffixes attached to verbs.