State of the UK climate 2017: supplementary report on climate extremes
Heatwaves in the UK are lasting twice as long as they did 50 years ago, ice days are disappearing and tropical nights are starting to occur as far north as Middlesbrough, according to a Met Office report. The new report shows that warm spells – when the maximum temperature is above the 90th percentile for the time of year – are becoming much more prolonged. From 1961 to 1990, the average longest warm spell each year was 5.3 days. From 2008 to 2017 this more than doubled to 13.2 days. This year, which is not included in these statistics, was even longer at 17 days.