The actual and anomaly maps are based on gridded data sets, with the anomaly information referring to the 30-year averaging periods 1961-1990 and 1991-2020.

Seasonal and annual maps are only available for: mean daily maximum temp.; mean daily minimum temp.; mean temperature; rainfall and sunshine.

Rainfall maps include all precipitation (rainfall, snow and hail). 

All maps (except for lightning strikes) are based on the HadUK-Grid dataset. Maps for the most recent year are provisional. Maps for previous years are updated on an annual basis in-line with the latest version of this dataset.