Whether in the morning or at night, if the armpit temperature measured in a calm state exceeds 37.3℃, it is a fever. Whether it is morning or evening, spring, summer, fall or winter, the normal value of human armpit temperature in a calm state is between 36-37 ℃. 2-4 o’clock in the morning, the human body temperature is the lowest, which is called the basal body temperature, but it is usually above 36 ℃. During the day after eating and after activities the body temperature may rise slightly, but it is also maintained within the normal range, that is, within the range of less than 37 ℃. Therefore, no matter in the morning or in the evening, if the axillary temperature exceeds 37.3℃, it should be considered that there is fever; if the axillary temperature is lower than 35℃, it should be considered that there is hypothermia. However, it is important to note that temperature measurement must be done in a calm state, not after eating or strenuous exercise, as this will lead to inaccurate temperature measurement.