The name given to the very hot summer weather that may persists for four to six weeks between mid-July through early September in the United States. In western Europe, this period may exist from the first week in July to mid-August and is often the period of the greatest frequency of thunder. Named for Sirius, the Dog Star, which lies in conjunction with the sun during this period, it was once believed to intensify the sun's heat during the summer months.
DOG DAYS
Meaning of DOG DAYS in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012