A humidity level of about 45 percent is considered comfortable outdoors. Levels of humidity can vary from place to place. Humidity levels change according to seasons. Winters are dry and humidity is high in the summer.
Humidity levels can vary indoors and outdoors. If humidity gets too high indoors, a dehumidifier can be used. When it gets too dry indoors, a humidifier can be used.
The amount of water vapor in the air is expressed as relative humidity. It is expressed in percent, as it is the ratio of the amount of water vapor in the air to the total amount of moisture the air can hold at a particular temperature.