So how common are 30+C temperatures in our region?

There have been 135 such days in Coventry since 1892! 

There have been 3 30+C days during May in the past 125 years, 19 in June, 59 in July, 49 in August and 5 during September.

As you can see, they have been much regular occurrences in the past than since the Millennium!