Wales moved to increased restrictions ahead of Christmas and to alert level 4 on 26 December 2020 with schools returning to operations in a phased between 4 and 18 January 2021.
Cyflwynwyd cyfyngiadau COVID-19 pellach yng Nghymru cyn y Nadolig, gan symud i lefel rhybudd 4 ar 26 Rhagfyr 2020, gydag ysgolion yn dychwelyd i weithredu fesul cam rhwng 4 a 18 Ionawr 2021.