London experienced a "tropical night" on Monday, May 20, 2024, as temperatures failed to drop below record May levels [1, 2].
This event marks a significant departure from typical spring weather patterns in the United Kingdom. The inability of the city to cool overnight increases the risk of heat-related stress for residents and puts pressure on urban infrastructure not designed for extreme heat.
At Kenley Airfield in south London, the daily-minimum temperature remained above 21°C [1]. This figure shattered the previous record for the warmest May night in the UK, which stood at 19.4°C [1].
The heatwave has caused a rapid succession of record-breaking events. The UK smashed a century-old temperature record for the second time in 24 hours [4]. This marks the second consecutive day that a May daily-minimum record was broken [3].
Forecasters expect the heat to intensify further. Maximum temperatures for the following day were predicted to reach up to 35°C [5].
Local authorities and residents have faced an unusual spring heatwave that prevented temperatures from dropping to typical May levels [1, 3]. The persistence of high nighttime temperatures, known as tropical nights, prevents the environment and human bodies from recovering from daytime heat.
“London experienced a 'tropical night' on Monday, May 20, 2024.”
The occurrence of a 'tropical night' in May suggests a shift in the intensity of spring heatwaves in Northern Europe. When nighttime temperatures remain high, the cumulative heat stress on the population increases because the body cannot cool down during sleep. This trend indicates that extreme temperature volatility is becoming more frequent, potentially necessitating new urban planning and public health strategies for the UK.
