Warm spells have more than doubled in duration

A warm spell is a run of at least six days for which daily maximum temperatures are sufficiently above average* for the time of year

1961-1990

average

Glasgow

Manchester

Birmingham

London

Average duration

of warm spell, days

1

5

10

20

30

2008-2017

average

A warm spell is a run of at least six days for which daily maximum temperatures are sufficiently above average* for the time of year

1961-1990

average

2008-2017

average

Average duration

of warm spell, days

1

5

10

20

30

Glasgow

Manchester

Birmingham

London