non-leap year; common year
Refers to a year that is not a leap year, i.e., a year with 365 days.
平年は2月が28日までです。
In a non-leap year, February has 28 days.
average year; normal year
Used in contexts like weather, climate, or statistics to describe a year with typical or average conditions.
今年の降水量は平年より多い。
This year's rainfall is higher than in an average year.
This summer is hotter than an average year.
The amount of rain was less compared to an average year.