Cold
い adjective
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of cold? It's cold.
さむい
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading which you learned with the kanji (Samurai (さむ)). Remember?
寒すぎてふとんから出られない。
It's too cold to get out of bed.
この寒い中、一時間もバスを待たなきゃならなかったんだよ。
I had to wait an hour in this cold for the bus.
僕がハワイに行くのは、寒さから逃れるためだけではなく家族に会うためでもあります。
I’m going to Hawaii not only to escape the cold, but to see my family.