Around 36 million years ago, an asteroid smashed into what is now the Canadian province of Newfoundland and Labrador. New research suggests that, for a brief time, the temperature at the point of impact exceeded 4,300 degrees F (2,370 C), making it the hottest temperature known to have occurred on Earth.
Source: Gizmodo – The Hottest Known Temperature On Earth Was Caused By an Ancient Asteroid Strike