What is a basal body temperature graph? The basal body temperature curve is a method commonly used by women when planning their fertility. By recording their daily basal body temperature and drawing a body temperature curve, they can infer their ovulation period and safe period. Basal body temperature refers to a woman\’s resting body temperature. It is usually measured after getting up in the morning and before engaging in heavy activities or eating. Because a woman\’s body temperature will rise to a certain extent after ovulation, only the basal body temperature measured at the same time has reference value. body temperature