寒冷 (hánlěng) means 'cold' or 'frigid' and describes an intensely cold temperature or climate. It is more formal and literary than the everyday word 冷 and is typically used to describe weather, environments, or regions with harsh cold.
今年冬天特别寒冷,大家要多穿衣服。
Jīnnián dōngtiān tèbié hánlěng, dàjiā yào duō chuān yīfu.
This winter is especially cold; everyone should wear more clothes.
北方的寒冷天气对南方人来说很难适应。
Běifāng de hánlěng tiānqì duì nánfāng rén lái shuō hěn nán shìyìng.
The cold weather in the north is hard for southerners to adapt to.
寒冷的夜晚,一杯热茶让人感到温暖。
Hánlěng de yèwǎn, yī bēi rè chá ràng rén gǎndào wēnnuǎn.
On a cold night, a cup of hot tea makes one feel warm.