Met Éireann ReAnalysis (MÉRA) Climate Reanalysis

Environment Spatial


Climate reanalysis is a systematic approach used to produce meteorological datasets for climate monitoring and research. They are created using a fixed version of a forecast model and a data assimilation system which utilises historical observations and they produce parameters that are physically consistent and often not routinely observed. Thus, climate reanalyses have the potential to extend the knowledge gained from current observation networks.

Met Éireann has carried out a 35-year very high resolution (2.5 km horizontal grid) regional climate reanalysis for Ireland using the ALADIN-HIRLAM numerical weather prediction system ( This reanalysis spans the period 1981 to 2015 and includes surface, near-surface and atmospheric parameters and is the first of its kind for Ireland.


Ireland, the United Kingdom, and an area of northern France. Parameters include: Mean sea level pressure Surface pressure Surface temperature 2 m temperature 2 m relative humidity u-component of 10 m wind v-component of 10 m wind Total cloud cover High cloud cover Medium cloud cover Low cloud cover Mixed layer depth Direct shortwave irradiance† Longwave irradiance† Snow depth Visibility∗ Total cloud cover (fog) Icing index∗ Precipitation type∗ Cloud base∗ Cloud top∗ Lightning∗ Hail diagnostic Height of T’w =0 isotherm Height of 0◦ isotherm

Additional Info

Field Value
Personal Data No
Sensitive Personal Data No
Business Data No
Spatial Data Yes
Data Sharing Yes
API Available No
Open Data Yes
Open Data Portal Link
Update frequency Monthly