I bring you Realistic Temperatures - Ireland, the tenth of a series of scripts for FS25 that will allow for more realistic and varied temperatures depending on the region you are playing.
For example, if you want to start a game with an Irish map you install the Ireland file and then start your game with the map.
Keep in mind if you don't have a weather station (as is such in the screenshot) your forecasts will not be completely accurate. You can buy one in the Construction menu under Tools. There are also a few mods for more variety of them.
This mod also allows for rain/snow/hail to happen in more seasons, region dependent.
Must have Realistic Weather installed. More thorough installation instructions in the readme file. Please read!