And there's me thinking you were in Donegal - where it's a toasty -3 .
You might be thinking of @DrPhil who's in Donegal.
Katesbridge, where the -8 is recorded, is the coldest part of Ireland. It's located in what's called a frost hollow. I'm less than 10 mile from there and it's -2 here.
Katesbridge is often noted in weather reports as the coldest location on the island of Ireland as well as within the United Kingdom. This is due to its status as a 'frost hollow', a low-lying location relative to its surroundings which allows the colder air to settle.