Dublin in January
Dublin in the winter is pretty windy and cold! The weather is extremely unpredictable and changes really quick. Rain storm, sun, wind and snow in one day. The city's architecture is not so impressive, churches and cathedral are made of grey stone, and the city centre is relatively new so not many historical places to visit. In the winter where the weather doesn't allow you to enjoy much walking through the city, touristically speaking, The Guinnes factory is the only attraction.
Insider Tip:Don't go in the winter, for tourism don't spend more than one day in Dublin city, rent a car and visit the countryside.. it is beautiful.