Hygrometer; Relative Humidity Measurement - Netatmo Weather Station User Manual

elevation, mountain elevation. To do so, the raw pressure measurements are adjusted by a standardized
formula. The value resulting from this is called mean sea level pressure.
Your Netatmo station displays the mean sea level pressure, meaning the pressure that the Netatmo station
would measure if it were at sea level elevation.
The mean sea level pressure is also the value given by weather forecast and reports on TV or Web.
How does the station knows its elevation?
When you setup the Netatmo Station with your iPhone, the Netatmo App uses the iPhone GPS to localize
your station and searches ground elevation.
How to set my station's elevation?
In the setting menu/my stations/your station's name/location you can set the exact elevation of your station
on the map.
Did you know it?
The barometric pressure indoor and outdoor is always the same.
For that reason the barometer sensor is located in the indoor module only.

Hygrometer

Hygrometer

Relative humidity measurement

Relative humidity is measured by both indoor and outdoor modules.
Did you know it?
Dry environments can cause throat or nose irritation. Comfortable indoor humidity ranges from 30% up to
70%.
What is relative humidity?
The relative humidity is a measure of the amount of water vapor in the air (at a specific temperature)
compared to the maximum amount of water vapor air can hold at that specific temperature level. Humidity is
represented by a percentage value.
Relative humidity depends on the temperature of the air. Warm air can hold more moisture than cold air.
A relative humidity of 100 % indicates that the air is holding all the water it can at the specified temperature,
and any additional moisture at that point will transform into condensation.
If the temperature decreases, but the amount of moisture in the air doesn't change, the relative humidity goes
up (since the maximum amount of moisture that cooler air can hold is smaller).
Did you notice?