Marraskuu on minusta raskas kuukausi, jos lukujärjestys on täynnä ja ulkona on pimeää.

In Finnish, names of months are normally written with a lowercase letter unless they begin the sentence.

So:

• marraskuu = November
• Marraskuu here only because it is the first word of the sentence

This is different from English, where November is always capitalized.

Here minusta means in my opinion, to me, or I think.

It comes from minä meaning I, but in this form it literally has the idea from me. In real usage, though, minusta is a very common way to give an opinion:

• Minusta tämä on hyvä. = I think this is good.
• Minusta marraskuu on raskas kuukausi. = November is a hard month for me / in my opinion.

So it is not a literal from me in English here. It is an opinion expression.

Because after on in a sentence like this, Finnish often uses the nominative for the thing being identified or described.

So:

• Marraskuu = the subject
• on = is
• raskas kuukausi = a hard month

This works like:

• Hän on opettaja. = He/She is a teacher.
• Tämä on hyvä idea. = This is a good idea.
• Marraskuu on raskas kuukausi. = November is a hard month.

Both raskas and kuukausi stay in the nominative because they form the predicate phrase.

Yes, literally raskas means heavy, but it is also used figuratively.

In this sentence it means something like:

• hard
• difficult
• draining
• burdensome

So raskas kuukausi is not physically heavy. It means November feels emotionally or mentally difficult.

Lukujärjestys usually means timetable or schedule, especially for school or university.

It is a compound word:

• luku relates to studying/reading
• järjestys means order

But you should learn lukujärjestys as one whole word meaning class schedule or study timetable.

In this sentence, lukujärjestys on täynnä suggests a busy schedule full of classes or study-related commitments.

Because täynnä is the normal word used in the expression olla täynnä, meaning to be full or to be packed.

So:

• lukujärjestys on täynnä = the schedule is full / packed

Täysi also means full, but it is used differently. It is more like a regular adjective meaning full, entire, or complete.

Compare:

• Lasi on täynnä. = The glass is full.
• Täysi lasi = a full glass

In this sentence, the idiomatic choice is on täynnä.

Ulkona means outside or outdoors in the sense of location.

It answers the question where?

So:

• ulkona on pimeää = it is dark outside

Compare:

• ulkona = outside, outdoors
• ulos = out, to the outside

So ulkona is correct here because the sentence describes a place, not movement.

This is a very common question.

Pimeää is the partitive singular of pimeä. In expressions describing a general condition or atmosphere, Finnish often uses this partitive form.

So:

• ulkona on pimeää = it is dark outside

The idea is not that some specific thing is dark. Instead, the whole situation/environment is dark.

Compare:

• Ulkona on pimeää. = It is dark outside.
• Huone on pimeä. = The room is dark.

In the second sentence, huone is a clear subject, so pimeä is nominative. In ulkona on pimeää, there is no specific subject like room or night being described.

Because Finnish does not need a dummy subject like English it in weather and condition expressions.

English says:

• It is dark
• It is cold
• It is late

Finnish simply says:

• On pimeää
• On kylmä
• On myöhä

So ulkona on pimeää is literally closer to outside is dark, but natural English needs it is dark outside.

Yes. Finnish word order is flexible.

This sentence begins with Marraskuu because that is the topic:

• Marraskuu on minusta raskas kuukausi...

But you could also say:

• Minusta marraskuu on raskas kuukausi...

That version puts more emphasis on my opinion.

Similarly, ulkona on pimeää is a very natural order because it starts with the place and then gives the condition.

So the current word order is natural, but not the only possible one.

Jos usually means if.

So the sentence means that November feels like a hard month if these conditions are true:

• the schedule is full
• it is dark outside

In a sentence like this, English might sometimes also use when in a more natural translation, especially if the speaker means a repeated or typical situation. But grammatically, jos is the normal word for if.

Because jos lukujärjestys on täynnä ja ulkona on pimeää is a subordinate clause, and Finnish normally separates subordinate clauses with a comma.

So the structure is:

• main clause: Marraskuu on minusta raskas kuukausi
• subordinate clause: jos lukujärjestys on täynnä ja ulkona on pimeää

That is why the comma appears before jos.