Simplify the following text for a Grade 10 native English-speaking person.
Original: The lowest temperatures are registered in July and August ( 18 Â ) and the highest in February ( maximum temperature 28 Â ) , the summer season in the southern hemisphere .
Simplified: The lowest temperatures are in July and August ( 18 Â C ) and the highest in February ( maximum temperature 28 Â C ) , the summer season in the southern hemisphere .