Dan, I believe it is 6 consecutive days, mute point though as it is just plain hot in those conditions.
(The heatwave would come behind streaks of six days above 40C that were recorded in 2009 and 1908.
From January 27 to February 1, 2009, the mercury reached highs of 43.2C, 45.7C, 43.4C, 43.1C, 41.1C and 40.6C on consecutive days.
From January 14 to January 19, 1908, the mercury reached highs of 40.7C, 43.1C, 41.8C, 43.4C, 42.8C and 43.4C on consecutive days.)
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