Telegraph: Periods of dangerously hot weather such as that which occurred in August 2003 could also become regarded as “the average” by 2040 and “relatively cool” by 2100. Between August 4 and 13 2003 the day time temperature exceeded 86F (30C) every day. But it was the high night time temperatures — up to 16.2F (9C) warmer in London than rural areas, and up to 12.6F (7C) higher in Birmingham and Manchester — that are believed to have killed many old people. Now the Met Office is …