The ambient temperature is a non-specific phrase used to describe the outside temperature. When taking the temperature with a thermometer, you are getting a general idea of the temperature of the surrounding air without taking into account the daily maximum and minimum temperature. Ambient temperature also does not take into account the humidity or wind in the air. The amount of moisture (mugginess) or humidity in the air can create higher temperatures which will cause the heat index to increase. Winds can also play a role in how cold a temperature will feel to a human. The wind chill factor can cause the air to have a perceived lower temperature.