What it means: total rain and melted snow over the year, averaged across the UK. It varies a lot from year to year and from place to place: the west and the hills get far more than the east. Climate projections point to wetter winters and drier summers, which matters for floods, reservoirs and farming. See the reservoir levels card for water supplies. Shown for context.

Source: Met Office, UK and regional series (HadUK-Grid).