why is there a negative temperature in Satellite view?

[blahdi]

See the part at bottom right. The temperature scale is in Farenheit.
2 questions:

1. Is Satellite view supposed to show temperature of different areas over the past some hours?
2. why is temperature range negative?

[idefix37]

@blahdi
This is the temperature of cloud tops

[Gkikas LGPZ]

@blahdi

1. INFRA+ sattellite images, show brightness temperatures of cloud tops.
   With the picker you can see the temperature, if it is less than -33C (-27 F).
2. By default, Windy "colorize" temps less than -27F (dark blue).

[blahdi]

@Gkikas-LGPZ said in why is there a negative temperature in Satellite view?:

temperatures of cloud tops.
With the picker you can see the temperature, if it is less than -33C (-27 F).
By default, Windy "colorize" temps less than -27F (dark blue

That makes sense. But, How do u use the temperature of cloud tops? i.e. what temperature range implies what weather effect on the ground in general?