К полуночи ветер стих, и на улице стало совсем тихо.

К полуночи means by midnight or toward midnight in this context.

The preposition к normally takes the dative case, so полночь becomes полуночи.

• nominative: полночь
• dative: к полуночи

With time expressions, к + dative often means by a certain time:

• к утру = by morning
• к вечеру = by evening
• к полуночи = by midnight

So the idea is that by the time midnight came, the wind had died down.

Because ветер is the subject of the verb стих.

In ветер стих, the wind is the thing doing the action/state change, so it stays in the nominative:

• ветер = the wind
• стих = died down / grew calm

This is a normal subject + verb structure.

Стих is the masculine past tense form of the verb стихнуть.

Dictionary form:

• стихнуть = to die down, calm down, subside

Past tense forms:

• стих = masculine
• стихла = feminine
• стихло = neuter
• стихли = plural

Since ветер is masculine singular, Russian uses стих.

Yes. It is a very common and natural way to say that the wind died down or subsided.

Russian often uses verbs like стихнуть for sounds, storms, emotions, or natural forces becoming weaker:

• буря стихла = the storm died down
• шум стих = the noise subsided
• боль стихла = the pain eased

So ветер стих is a standard collocation.

Because тихо here is not an adjective modifying a noun. It is a predicative adverb/state word, meaning quiet in the sense of it became quiet.

Compare:

• тихий двор = a quiet courtyard
  
  • тихий is an adjective describing двор
• на улице стало тихо = it became quiet outside
  
  • тихо describes the overall state/situation

So стало тихо is an impersonal expression meaning it became quiet.

Because this is an impersonal construction.

In на улице стало совсем тихо, there is no real grammatical subject like улица doing the action. Russian often uses стало in neuter singular when expressing a change of state:

• стало холодно = it became cold
• стало темно = it became dark
• стало тихо = it became quiet

So стало does not agree with улице. It is just the standard impersonal past form.

Because на улице is the normal Russian way to say outside or in the street.

Russian uses на with улица in this meaning:

• на улице холодно = it’s cold outside
• на улице никого нет = there’s no one outside / in the street

Using в улице would not be correct here.

Also, улице is in the prepositional case after на:

• улица
• на улице

Совсем is an intensifier here. It strengthens тихо and means something like:

• completely
• quite
• really

So совсем тихо means completely quiet or very quiet indeed.

It gives the sentence a stronger sense that by that time, the outside had become fully calm and silent.

Because the sentence joins two clauses:

1. К полуночи ветер стих
2. и на улице стало совсем тихо

Each clause has its own verb:

• стих
• стало

In Russian, when и joins two independent clauses, a comma is normally used.

Yes. Russian word order is flexible, and changes usually affect emphasis rather than basic meaning.

For example, you might also see:

• К полуночи стих ветер, и на улице стало совсем тихо.
• Ветер к полуночи стих, и на улице стало совсем тихо.

The original version is neutral and natural. Putting стих before ветер can sound a bit more literary or put more focus on the action.

It is mainly about quietness, meaning the absence of noise, but in context it can also suggest a broader feeling of calm or stillness.

In this sentence, after ветер стих, на улице стало совсем тихо suggests both:

• the sounds have faded
• the whole outdoor atmosphere has become still and calm

So the sentence has a peaceful, atmospheric feel, not just a purely factual one.