What is the average internal temperature of the human body in degrees Fahrenheit?

The average internal temperature of the human body is widely recognized as 98.6 degrees Fahrenheit. This figure, established by research in 1851, represents a standard benchmark for normal body temperature, though it can vary slightly from person to person due to factors such as time of day, activity level, and age. Body temperature is typically maintained within a narrow range because it is crucial for the optimal functioning of bodily processes, including metabolism and immune response.

While temperatures lower or higher than this average may occur and can still be within a normal range under certain conditions, 98.6 degrees Fahrenheit is generally accepted as the standard for what is considered a "normal" body temperature in healthy adults.