What is the range of the normal basal body temperature?
The average basal body temperatures can range between 96.8 and 97.8 F before ovulation and 97.6 to 99.0 F after ovulation. Optimally, the temperature will not change by more than 0.5 degree F in the follicular phase and will stay above the coverline during the luteal phase. Persistently lower basal body temperatures with anovulation could be a sign of endocrine problems such as hypothyroidism.
