Is féidir le réamhaisnéisí míosúla léargas a thabhairt ar na treochtaí aimsire atá le teacht sa mhí. Níor cheart iad a úsáid chun críoch pleanála áfach, ós rud é nach mbíonn siad chomh cruinn leis an réamhaisnéis 10-lá. Bíonn sé níos deacra réamhaisnéisí a thuar níos faide ná seachtain amháin chun tosaigh mar gheall ar nádúr anordúil an atmaisféir. Míniúcháin ar réamhaisnéis mhíosúil.
Week 1 (Monday 11 January to Sunday 17 January)
As high pressure becomes situated between Spain and the Azores, it will allow a more Atlantic zonal flow to move in over Ireland early in the week. It is expected to be more unsettled across the country with rain-belts affecting the region in this westerly airflow. This will allow temperatures to recover to near normal values for the time of year with frost unlikely. Winds will be fresher for a time too. There may be a drier slot following on Wednesday and/or on Thursday but overall it will stay unsettled with further rain or showers, especially for the weekend and the possibility of a developing low pressure area coming close to Ireland towards the end of the period. Frost may return later in the week and over the weekend as temperatures fall back a bit. There is the risk of spot flooding in parts early in the week. Towards the end of the period there is the risk of some strong winds.
Week 2 (Monday 18 January to Sunday 24 January)
Initially, pressure is expected to be low close to Ireland bringing rain or showers and blustery, possibly strong, winds. Current indications suggest a changeable pattern following which could be easterly for a time over Ireland with eastern areas having more showers fed in, possibly wintry. This would mean that western parts could average out a little drier than average. Pressure is likely to remain high to the northwest of Ireland. Temperatures are expected over this period to average close to normal across Ireland. Frost is likely too but there are no signals for very severe cold weather, though confidence is lower for this period.
Week 3 (Monday 25 January to Sunday 31 January)
With an upper level low extending from the southwest over Ireland during this period, it looks like it will be a more unsettled week. This would suggest an Atlantic regime or southwest regime developing with spells of rain or showers. There is a chance that some northwest fringes may be a little drier than average but most places look like having near to or above average rainfall. Temperatures are expected to average out close to normal. Extremes of weather especially wind/rain cannot be ruled out.
Week 4 (Monday 01 February to Sunday 07 February)
Confidence is low at this stage. There is a signal that high pressure will build from Scandinavia into Britain keeping it drier than average over Ireland but this is by no means certain and there could be wintry showers. There is no strong signal regarding temperatures but hard frosts are likely at times.