As per the study done in 1800, the normal body temperature of most people is 98.6 degrees Fahrenheit or 37 degrees Celsius. The average temperature of the body is noted somewhere between 97.5 F or 36.4 C and 97.9 F or 36.6 C. According to well-known medical experts, body temperature between 97 to 99 degrees Fahrenheit is measured as normal. There are chances when the perfectly active person can have the temperature at a higher or lower side. This fluctuation can be noticed often from infanthood to adulthood.