This article does not take into consideration seasonal lag, where temperature trails behind sunlight by 4 to 8 weeks. So while the solstice in June is peak sunl

This article does not take into consideration seasonal lag, where temperature trails behind sunlight by 4 to 8 weeks. So while the solstice in June is peak sunlight August is peak temperature, so summer being mid June to mid September with august being the hottest time of year makes sense.