Depending on variety, the orange habanero is among the hottest of peppers, registering 210,000 Scoville units. Red habaneros typically average 150,000 units. The mildest pepper, 0 on the Scoville scale, is the bell pepper, which most people don't realize is a part of the chile pepper family. The heat of a pepper depends on more than genetics, however. Drought and high temperatures can make a pepper hotter, while mild temperatures and plenty of moisture render it milder.