A data-driven normal for the Spain temperature chart

--> --> --> For the past few years I’ve kept this chart running: the daily mean temperature in Spain against its climatological normal, with the anomaly shaded in red (above normal) and blue (below). Whenever I want to know “is this heatwave or cold snap actually unusual, or does it just feel that way”, this is the chart I reach for, a line, not a column, because temperature is an interval scale…