今天晚上气温会降到零下五度。

Jīntiān wǎnshang qìwēn huì jiàngdào língxià wǔ dù.

Tonight the temperature will drop to five degrees below zero.

听说明天会到零下二十度。

Tīngshuō míngtiān huì dào língxià èrshí dù.

I heard it will drop to minus twenty degrees tomorrow.

晚上气温会到零下，你不要开窗睡觉。

Wǎnshang qìwēn huì dào língxià, nǐ búyào kāichuāng shuìjiào.

At night the temperature will go below zero; don't sleep with the window open.