snow day

Short definition from Wiktionary

Noun

1. 1
   A day when a school or other workplace is closed due to bad winter weather, especially snow.
2. 2
   A day when a school or other workplace is closed due to bad winter weather, especially snow: A day when a school or other workplace is closed due to weather
3. 3
   A day set aside on a school calendar in certain climates, assuming a closure will occur during a given time period.
4. 4
   A day on which a fall of snow is observed.
5. 5
   Used other than figuratively or idiomatically: see snow, day.