At the start of the period, only some local authorities were under local lockdown, followed by the national circuit breaker (23 October to 9 November 2020).
Ar ddechrau'r cyfnod, dim ond rhai awdurdodau lleol oedd dan gyfyngiadau clo lleol, ac yna cafwyd y cyfnod clo byr (23 Hydref i 9 Tachwedd 2020) .