Стоит нам выйти из дома, как начинается дождь.

Here стоит is part of a fixed idiomatic pattern, not the ordinary meaning stands.

The construction is:

стоит + dative + infinitive, как ...

It means something like:

• one has only to do something, and ...
• as soon as someone does something, ...
• no sooner ... than ...

So Стоит нам выйти из дома, как начинается дождь means that the moment we go out, it starts raining.

A very literal way to think of it is:

It only takes our stepping out of the house for the rain to begin.

Because this is an impersonal construction, and in Russian the person involved in that kind of structure is often put in the dative.

So:

• нам = to us / for us
• стоит нам выйти = literally something like it only takes for us to go out

This is similar to other Russian patterns where the person is in the dative:

• мне холодно = I am cold
• ему нужно идти = he needs to go
• нам пора = it’s time for us

So the dative here is normal and expected.

Because the sentence is about a single completed trigger action: stepping out.

выйти is perfective, so it marks the action as a whole, with a clear endpoint: going from inside to outside.

That fits the meaning very well:

• Стоит нам выйти... = The moment we step out...

If you used выходить, it would sound more like an ongoing or repeated process, which is less natural here.

In this construction, Russian often prefers the perfective infinitive because the first action is treated as the event that immediately triggers the second one.

It is a correlative construction: the first clause sets up the trigger, and the second clause gives the immediate result.

Pattern:

Стоит кому-то сделать X, как происходит Y.

Meaning:

• As soon as someone does X, Y happens
• No sooner does someone do X than Y happens

So in your sentence:

• Стоит нам выйти из дома = As soon as we step out of the house
• как начинается дождь = it starts raining

This construction often gives a feeling of immediacy, and sometimes irritation, irony, or inevitability.

No. Here как is a conjunction, not the question word how.

In this pattern, как introduces the second event, the one that happens right after the first.

So it does not mean how at all here. In English, the whole pattern is better translated as:

• as soon as
• the moment
• no sooner ... than ...

So you should read как here as part of the fixed structure, not as a separate word with its usual meaning how.

Because the sentence describes a repeated or typical situation.

It means something like:

• Whenever we go out, it starts raining
• Every time we step outside, the rain begins

Russian often uses the present tense for habitual facts or repeated experiences.

So начинается дождь here is not necessarily about one specific moment happening right now. It is more like a general pattern.

If you wanted one specific past event, you would usually say:

Стоило нам выйти из дома, как начался дождь.

That means:

As soon as we stepped out of the house, it started raining.

Because that would usually mean something completely different.

Нам стоит выйти из дома normally means:

• We should go out
• It would be a good idea for us to leave the house

That is the ordinary стоить meaning to be worth / should.

But Стоит нам выйти из дома, как ... is the special idiomatic construction meaning:

• As soon as we go out, ...
• One has only to go out, and ...

So word order matters here. Starting with стоит and then continuing with как strongly signals this fixed pattern.

As written, it most naturally sounds like a repeated, familiar pattern.

It gives the sense of:

• This always happens
• Every single time we go out, it starts raining

It can also sound a bit like a complaint or joke about bad luck.

So the emotional flavor is often something like:

• Just our luck
• We can’t even step outside without rain starting

If you wanted a one-time event, Russian would more likely use past forms:

Стоило нам выйти из дома, как начался дождь.

Because выйти means to go out / to come out, and when you leave an enclosed place in Russian, you usually use из.

So:

• выйти из дома = to go out of the house / leave home

This is the normal combination.

Compare:

• выйти из комнаты = leave the room
• выйти из машины = get out of the car
• выйти из здания = leave the building

So из дома is exactly what you would expect after выйти.

Yes. For example:

• Как только мы выходим из дома, начинается дождь.
• Только выйдем из дома — начинается дождь.

These also mean roughly:

• As soon as we go out, it starts raining

But Стоит нам выйти из дома, как начинается дождь is a very common and expressive way to say it. It emphasizes how immediate and predictable the second event is.

So the choice is not just about grammar; it is also about style and nuance.

Because the sentence focuses on the beginning of the rain, not simply the fact that rain is falling.

• идёт дождь = it is raining
• начинается дождь = the rain starts / begins

In this sentence, the important idea is the sudden timing:

• we step out
• then the rain starts

So начинается дождь matches that meaning better than идёт дождь.