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A tropical night occurs in the United Kingdom when the temperature does not fall under 20° C during the night time. The same definition is in use in many European countries, such as Spain, Sweden, the Netherlands, Germany and Finland.
The Met Office began tracking 'tropical nights' in 2018. This criteria is infrequently met at the moment, with the 30 years between 1961 and 1990 seeing just eight tropical nights. In the 10 years between 2008 and 2017, there were four such nights, and in 2018 there were two warm nights that stayed above 20C.
- McGrath, Matt (2 November 2018). "Weather: UK experiencing hotter days and 'tropical nights' - Met Office". BBC. Retrieved 9 April 2019.
- "Potential record-breaking heat today". Met Office. 25 July 2019. Retrieved 26 July 2019.
- Knapton, Sarah (2 November 2018). "Met Office starts tracking 'Tropical Nights' in Britain as weather becomes more extreme". The Telegraph. Retrieved 26 July 2019.
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