Normal rectal temperature is typically 0.27° to 0.38☌ (0.5° to 0.7☏) greater than oral temperature. Prolonged change to daytime-sleep and nighttime-awake cycles will effect an adaptive correction in the circadian temperature rhythm. This circadian rhythm is quite constant for an individual and is not disturbed by periods of fever or hypothermia. The nadir in body temperature usually occurs at about 4 a.m. Among normal individuals, mean daily temperature can differ by 0.5☌ (0.9☏), and daily variations can be as much as 0.25 to 0.5☌. ![]() ![]() Normal body temperature is considered to be 37☌ (98.6☏) however, a wide variation is seen.
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