During the nearly 160 years covered by the analysis, the average oral temperature gradually fell by more than one degree. As a result, the "new normal" seems closer to 97.5˚ F. This observation held up even after accounting for age, gender, body size, and time of day.

What is the new normal body temperature?

Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the "normal" body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C).

Can your normal body temperature change?

Your Temperature Naturally Fluctuates

On average, an individual's core body temperature varies from 36.5–37.5 °C (97.7–99.5 °F) over the course of a day. Your body temperature doesn't remain constant, however, it fluctuates according to your circadian rhythm.