I april regner det tit, men blomsterne kommer frem i haven.

Yes. I april means in April.

A couple of useful points:

• Danish normally uses i with months: i april, i maj, i december
• You do not use an article, so not i den april
• Month names are usually not capitalized in Danish, so april, not April

So I april is the normal way to say in April.

This is because Danish main clauses usually follow the V2 rule: the finite verb must come in the second position.

In this sentence, I april is placed first. Once that happens, the verb regner must come next:

• I april = first element
• regner = second element
• det = subject comes after the verb

So:

• I april regner det tit = correct
• I april det regner tit = not correct in normal Danish main-clause word order

Compare:

• Det regner tit i april = also correct
• I april regner det tit = same meaning, but with in April emphasized first

Here det does not really refer to a specific thing. It is a dummy subject, just like English it in it rains.

Weather verbs in Danish normally use det:

• Det regner = it is raining / it rains
• Det sner = it is snowing / it snows
• Det blæser = it is windy / it blows

So regner det is just the V2 version of det regner.

Tit means often or frequently.

So:

• det regner tit = it often rains

Yes, it is very close to ofte. In many situations, they can both work:

• Det regner tit
• Det regner ofte

A learner-friendly way to think about it:

• tit = very common, everyday word
• ofte = also common, sometimes feels a little more neutral or formal depending on context

In this sentence, tit sounds very natural.

Because Danish usually puts the definite article at the end of the noun.

So:

• blomster = flowers
• blomsterne = the flowers

and

• have = garden
• haven = the garden

This is very different from English, which uses a separate word:

• English: the flowers, the garden
• Danish: blomsterne, haven

So the endings are doing the job of English the.

Kommer frem means something like:

• come out
• appear
• emerge
• become visible

In this spring sentence, blomsterne kommer frem suggests that the flowers are starting to appear out of the ground or become visible in the garden.

The word frem adds the sense of forward / out / into view. Without frem, kommer would just mean come or are coming, which is too vague here.

This is a great question because it can confuse English speakers.

Danish has:

• at have = to have
• en have = a garden

They are different words, even though they look similar.

In your sentence, haven is:

• have = garden
• -n / -en = the definite ending

So i haven means in the garden, not anything connected to the verb to have.

Danish uses the present tense for general truths, habits, and things that usually happen, just like English often does.

So:

• I april regner det tit = In April, it often rains
• blomsterne kommer frem i haven = the flowers come out in the garden

This does not have to mean it is raining at this exact moment. It describes a typical pattern in April.

Because men means but, and here it joins two full clauses:

• I april regner det tit
• blomsterne kommer frem i haven

In standard Danish writing, a comma is normally used before men in a sentence like this.

So the comma helps show the contrast:

• it often rains in April,
• but the flowers still come out in the garden

Yes, absolutely. That is also correct and natural.

The difference is mostly emphasis:

• I april regner det tit ... puts in April first for focus
• Det regner tit i april ... starts more neutrally with the basic statement

Both are good Danish. The version in your sentence is a nice example of how Danish often moves a time expression to the front, which then triggers the V2 word order.