Rome is wonderful every month of the year, but when planning your visit, you may want to design around weather, crowds, and, as Catholics, important feast days and papal events.
It’s still Christmas! Off season, small crowds, and cool temps.
The lowest of the low seasons.
April 29th: The Feast of Saint Catherine
May 31: Procession in the Vatican Gardens to the Lourdes Grotto
June 29th: The Feast of Saints Peter and Paul
Hot. Some things are closed. Many Romans are out of town, so crowds are small. Several big feast days, including the Annunciation. Details here.