I can understand that you are worried about these multiple low readings. Normal body temperature is not a single number, but rather a range of temperatures. The average normal body temperature is most often said to be 98.6° F (37° C). This may have been correct when it was first determined 150 years ago. But our bodies have changed.
More recent research suggests that the average adult body temperature is about one degree lower, 97.5° F (36.4° C). Older adults often have an even lower body temperature without it indicating any health problems.
However, recent studies indicate that 98.2° F (36.8°C) is a more accurate average, and in older individuals it may be about 1°F lower. One small study even suggested that in healthy older patients, body temperature ranged from 94° F to 99.6° F, with an average of 97.7° F.
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Dr. Gupta, MD