Temperature has a big impact on the performance of athletes. High temperature can cause heat illnesses, while very low temperatures may lead to hypothermia. High temperatures also result in thinner air, which results in less drag on athletes in sports where the air resistance can play a major role. Precipitation also can have a huge impact on how athletes play. Some sports are cancelled because it is raining. Some are also determined dangerous when the ground is wet because a player might slip. Baseball, Cricket and Tennis usually don't take place during any level of precipitation. Any winter sport might be cancelled because of the amount of snow on the ground. Winds can blow the equipment in a sporting event, changing the direction or travel of a ball. Id you are playing golf the wind levels may influence the way a shot is taken. Wind also affect track, because when they are running wind may slow them down. Other sports cannot be play if there is not enough visibility. The difficulties of playing in bad light can be dangerous. Fog would be one of the factors when there isn't enough visibility. The position of the sun can be a disadvantage to many competitors too.