Thunderstorm

A thunderstorm is a weather condition which takes place randomly during some rain- or snowfalls. All changes from these weathers apply, but since lightning occurs and the light level falls below 7, thunderstorms are distinct. This means that during a thunderstorm, aggressive mobs will be able to spawn, even in the brightest of day.

Trivia

 * If you stand near a lighting it will make the same sound as a exploding TNT.