36.5–37.5 °C (97.7–99.5 °F) 36.5–37.5 °C (97.7–99.5 °F)
98.6 degrees Fahrenheit, or 37 degrees Celsius is approximately normal temperature for the human body.   The human body operates best at 98.6 degrees Fahreinheit (about 37o C). The healthy body temperature for humans is between 95 and between 99.3. The average human body temperature is 98.6º F or 37º C, but it can vary somewhat. Average adult temperature is 98.2º F (36.8º C). Older people average a bit less. These values can also vary with time of day. The normal human body temperature is often stated as 36.5–37.5 °C (97.7–99.5 °F). In adults a review of the literature has found a wider range of 33.2–38.2 °C (91.8–100.8 °F) for normal temperatures, depending on the gender and location measured. Normal human body temperature varies slightly from person to person and by the time of day. Consequently, each type of measurement has a range of normal temperatures. The body temperature of a healthy person varies during the day by about 0.5 °C (0.9 °F) with lower temperatures in the morning and higher temperatures in the late afternoon and evening, as the body's needs and activities change. Normal human body temperature varies slightly from person to person and by the time of day. Consequently, each type of measurement has a range of normal temperatures. Normal human temperature Previously, average oral temperature for healthy adults had been considered 98.6 °F (37.0 °C), while normal ranges are 36.1 to 37.8 °C. In Russia, the temperature had been measured axillary. 36.6 °C was considered ideal temperature, while normal ranges are 36 to 36.9 °C.  It is literally set higher than usual. 37°C (98.6°F) - Normal body temperature (which varies between about 36.123-37.5°C (96.8-99.5°F) 38°C (100.4°F) - Sweating, feeling very uncomfortable, slightly hungry. 39°C (102.2°F) (Pyrexia) - Severe sweating, flushed and very red. Fast heart rate and breathlessness. There may be exhaustion accompanying this. The normal core body temperature of a healthy, resting adult human being is stated to be at 98.6 degrees fahrenheit or 37.0 degrees celsius.  Most people think of a normal body temperature as an oral temperature of 98.6°F (37°C) . This is an average of normal body temperatures. Your temperature may actually be 1°F (0.6°C) or more above or below 98.6°F (37°C) . Also, your normal body temperature changes by as much as 1°F (0.6°C) throughout the day, depending on how active you are and the time of day. Body temperature is very sensitive to hormone levels and may be higher or lower when a woman is ovulating or having her menstrual period. The ideal core temperature is considered to be around 98.6° Degree Fahrenheit or 37° degree Celsius. This temperature is however, the average body temperature and the overall normal temperature varies from a minimum of 97.7° Fahrenheit (36.5° Celsius) to a maximum of almost 99.5° Fahrenheit (37.5° Celsius). Any temperature above or below this range is abnormal.  'A Critical Appraisal of 98.6F, the Upper Limit of the Normal Body Temperature, and Other Legacies of Carl Reinhold August Wunderlich', JAMA. 1992;268(12):1578-1580. 'Normal Body Temperature: Rethinking the normal human body temperature', Harvard Health Publications. NHS Direct. Most people think of 'normal' body temperature as 37C (98.6F), measured using a thermometer in the mouth.
http://www.answers.com/Q/What_is_the_normal_human_body_temperature https://en.wikipedia.org/wiki/Human_body_temperature https://en.wikipedia.org/wiki/Human_body_temperature https://answers.yahoo.com/question/index?qid=20070324183207AAcbX1Z https://in.answers.yahoo.com/question/index?qid=20061003023919AAZgtJL http://hypertextbook.com/facts/LenaWong.shtml http://www.webmd.com/first-aid/body-temperature http://drsircus.com/medicine/low-body-temperature-symptoms-causes-treat/ http://www.webmd.boots.com/a-to-z-guides/normal-body-temperature
ideal body temperature for humans