The physics of a cool day can make thunder sound louder when it's a bit chilly outside. Here's how it works.

Temperature, humidity and distance all affect the sound of thunder.

Have you ever noticed thunder often sounds louder when it's colder outside? There's a scientific reason why! In a normal thunderstorm, sound waves from thunder dissipate in all directions.

• I think the sound of thunder comes from outer space. Faith Stingley, grade 2, James Cole • Hard rain is the cause of thunder. Aidan Salazar, grade 2, James Cole • A monster going bowing.