2020 is a leap year, so we have an extra day in February.
extra day
Frequency:
70
%
We get an extra day in February on leap year.
February 29th
Frequency:
60
%
February 29th only occurs in leap years.
rare occurrence
Frequency:
50
%
Seeing snow in April is a rare occurrence, just like leap day.
Idiomatic Expressions for leap day
Phrase: leap of faith
Meaning: an act of believing in something despite having no evidence or assurance
Usage: Starting a new business is a leap of faith, especially if you launch it on leap day.