On average across the year, yes, Ireland is hotter than Finland . Ireland has an average temperature of 10°C/50°F and Finland has an average temperature of 5°C/41°F.
Ireland's hottest month is July, with an average maximum temperature of 19°C/66°F, which is not hotter than Finland's hottest month (also July, with an average maximum temperature of 22°C/72°F).
On average across the year, no, Ireland is not colder than Finland . Ireland has an average minimum temperature of 8°C/46°F and Finland has an average minimum temperature of 1°C/34°F.
Ireland's coldest month is January, with an average minimum temperature of 4°C/39°F, which is not colder than Finland's coldest month (also January, with an average minimum temperature of -10°C/14°F).
On average across the year, yes, Ireland has more rain than Finland. Ireland has an average annual rainfall of 867mm and Finland has an average annual rainfall of 484mm.
Ireland's wettest month is December, with an average monthly rainfall of 89mm, which is wetter than Finland's wettest month (August, with an average monthly rainfall of 60mm).