Regions have different thresholds for issuing alerts that weather is dangerously hot for the old, very young or those with medical conditions
Threshold maximum day and night temperatures defined by the Met Office National Severe Weather Warning Service, C
Day
Night
0C
5
10
15
20
25
30
London
South-east
South-west
Eastern
West Midlands
East Midlands
North-west
Yorks & Humber
North-east