The 100m Sprint was introduced to the Olympic Games in 1896 which was held in Athens at the Panathenaic Stadium, and was won by USA's Thomas Burke in 1896 with a time of 12 seconds.
Hotter weather with a slight tailwind (up to 2m/s) can be important for a sprinter's performance. Especially for Usain Bolt of Jamaica who was assisted by a 0.9m/s tail wind during his record-breaking sprint of 9.58 seconds at the 2009 World Championships in Berlin. The increased tailwind helped to reduce atmospheric drag and the hotter temperatures meant thinner air and fewer pesky molecules to get in the way. If you were ever wondering who would win in a race between Usain Bolt and a cheetah… then wonder no longer, a cheetah named Sarah ran 100m in 5.95 seconds at Cincinnati Zoo. No competition really.