The UK is once again experiencing a heatwave, a situation likely to become ever more common whilst we fail to solve climate change. Although the temperature is not yet the giddy heights of last year’s record-setting monstrosity, which made me curious as to what exactly constitutes a “heatwave”.

It turns out it depends on where in the UK you live. One declares a heatwave when a location experiences daily maximum temperatures of at least a certain threshold for at least 3 consecutive days. But what the threshold is varies based on which county you are in, as the Met Office shows in the below map.