The most reliable determinant of body temperature is to obtain an oral temperature using a glass thermometer with mercury. Digital thermometers that are sold commercially often vary from one minute to the next. If someone has a lower body temperature during the day, this may be suggestive of a problem. This is determined by hormones secreted from the thyroid gland. Certain syndromes can produce lower or higher body temperatures, eg.
Warm hands indicate relaxation.
Cold hands reflect tension. Log the temperatures on a log sheet, indicating the dates and time and how your temperature was taken, eg.