(れいか)

れいか
noun
below zero; sub-zero
weathernumber
1. below zero; sub-zero; below freezing
Temperature below zero degrees, typically Celsius. Used when stating temperatures below the freezing point.
今朝(けさ)零下(れいか)5()だった。
It was minus 5 degrees this morning.
When the temperature drops below zero, water pipes freeze.
In Hokkaido, temperatures can drop below minus 20 degrees in winter.

Usage

Used before a number to indicate a temperature below zero: 零下(れいか)10() (minus 10 degrees). マイナス is also commonly used in spoken Japanese for the same purpose.

Common collocations

Similar words