寒さが

the cold

→ 寒さ
phrase Rare #29,926
the cold 寒さ means “cold” or “coldness,” and が marks it as the subject of the following predicate, so this usually appears as part of a longer sentence.
JA: 寒さが厳しくなってきた。
EN: The cold has been getting more severe.

僕には寒さがひどくこたえる。

The cold really gets to me.

日に日に寒さが増した。

It got colder day by day.

今年の冬は寒さが厳しいですね。

This winter has been especially cold, hasn’t it?

寒さが身にしみる。

The cold cuts right through me.

彼には寒さがとてもこたえる。

The cold really gets to him.

日ごとに寒さが増しております。

It’s getting colder with each passing day.