Final answer:
Hormonal changes are associated with a 0.5 to 1°C change in body temperature during a 24-hour period.
Step-by-step explanation:
The factor associated with a 0.5 to 1°C change in body temperature during a 24-hour period is hormonal changes. Hormones, such as cortisol and melatonin, regulate the body's circadian rhythm and play a role in maintaining body temperature. For example, cortisol levels rise in the morning, which helps to increase body temperature, while melatonin levels increase in the evening, contributing to a decrease in body temperature.