It is explained in the passage that the term “Fahrenheit” .

Fahrenheit is the system of measuring the
temperature, how hot or cold the weather is, and
used by many people in Britain. The freezing
point Fahrenheit is 32 degrees. So a cold
winter's day in Britain would have a temperature
of 38°f (3° centigrade) and a hot summer's day
would have a temperature of 90°f (32° entigrade)
The Fahrenheit scale was invented by the
German scientist Gabriel Fahrenheit in 1710.
Today in Britain most people over twenty five
know the Fahrenheit scale but the centigrade
system (Celsius) is being used more and more.
Weather forecasts on television and in
newspapers show temperature in both scales.