降こう水すい確かく率りつ

noun

chance of precipitation; probability of rain

Commonly used in weather forecasts to express the likelihood of rain or snow as a percentage.

• 明日あしたの降こう水すい確かく率りつは80%です。

  Tomorrow's chance of precipitation is 80%.

• 降こう水すい確かく率りつが高たかいので、傘かさを持もって行いったほうがいい。

  Since the chance of rain is high, you should take an umbrella.