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15. Explanation of Terms

Perceived temperature
See "Windchill"
Comfort indicator
The symbols of the comfort indicator (the three different smilies
conditions and will be shown according to the following table:
Temperature
Humidity
20%
<18°C
18 -19.9°C
20 -21.9°C
22 -23.9°C
24 -25.9°C
26 -27.9°C
> 28°C
Depending on the relationship between temperature and air humidity, clearly limited areas of
comfortable or uncomfortable air conditions can be defined.
At a temperature of 25°C an air humidity below 30% is perceived to be too dry (e.g. heating air) and
a humidity above 60% to be sultry.
Dew point
The dew point is a point of temperature which depends on the coincidence of a certain air pressure,
temperature and air humidity.
At this point of temperature the condensation of the air humidity starts, the so called dewing, the air
humidity condenses out and settles in form of a liquid (mist, vapour).
If the dew point for the water vapour is below 0°C, it condenses as snow or hoar.
Weather forecast
The weather forecast of the weather station is reflected in different weather symbols which are
calculated from the rate of increase or decrease of the air pressure (tendency).
This changing rate of the air pressure is the decisive factor for the forecast of the weather to be
expected, the absolute value plays only a secondary role here. Generally one can say that an
increasing air pressure means better weather, whereas a decreasing air pressure means that the
weather will become worse.
30%
35%
40%
45%
50%
55%
) reflect the room air
60%
65%
70%
75

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