Theorie:

Study general terms about the weather.
 
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Barometer – Barometer, Luftdruckmessgerät

Below freezing – Unterhalb des Gefrierpunkts / unter 0°C

Degrees – Grad
 
Weather forecast – Wettervorhersage

Weather station – Wetterstation

Weatherman – Meteorologe
 
Examples:
 
There are some weather stations in out city.
  
It is 20 degrees above zero.