The Daily Rhythms in the Core Temperature during Spring and Autumn under Natural Conditions in Young Women

Studies of the daily rectal temperature rhythms during May and October-November in three female subjects leading normal lives under natural conditions disclosed that although a rhythm of rectal temperature existed in all three subjects in both seasons, the temperature level seems to be lower in October-November than in May, especially during the nighttime. The phasing of the rectal temperature rhythm did not seem to differ between the two seasons.