Daily rainfall, maximum and minimum air temperature 1x1km grids are available below. The grid covers Ireland and is based on the Irish Grid (TM65) coordinate system. Interpolation models were used to calculate the rainfall and temperature grid point values with model inputs from observations recorded at Met Éireann stations. For monthly, seasonal and annual gridded datasets, we recommend you use the grids on www.met.ie/monthly-rainfall-and-temperature-grids/. The climatological standard normals datasets are available at www.met.ie/climate/30-year-averages.

Daily rainfall totals are expressed in millimetres (mm) and are collated by year from 1941 to 2024. The daily rainfall total is presented without a decimal point. For example, a value of 123 is equivalent to a daily rainfall total of 12.3 mm. The number of stations available for rainfall gridding analysis can vary due to stations closing and new stations being opened. For example, in 2020 there were 436 stations available while in 2014 519 stations were recording rainfall data. The average number of stations available over the past 10 years is around 497, while in 2024 there were up to 456 stations.

In December 2022 the daily rainfall grids from 1941 to 1980 were re-calculated using the same baseline dataset used in the generation of the 1981-2022 daily rainfall grids. The baseline is used to normailse the daily rainfall data making the interpolation process more robust and consistent.

Daily air temperatures are given in degrees Celsius (°C) and are collated by month for each year from 1961 to 2024 with each file containing one month of data. Mean temperature values can be determined by calculating the average of the maximum and minimum temperature at a point, that is: Tmean = (Tmax+Tmin)/2. The number of stations available for temperature gridding analysis varies each year, from 48 stations in 1961 to 105 stations in 2004. The average number of stations available over the past 10 years is around 72, while in 2024 there were up to 51 stations.