What does ‘850 hPa temperature’ mean?

‘850 hPa temperature’ is the temperature at about 1.5 km, which is generally above the atmospheric boundary layer. It means that there are no daily temperature variations and surface such as the cool sea don’t affect this temperature. The ‘850 hPa temperature’ is used to locate and identify warm fronts and cold fronts.

Btw, hPa stands for hecto Pascal, which is a unit to measure air pressure.

1hPa (hectopascal) = 100 Pa (Pascal) = 1mbar (millibar)


What does ‘2 m temp (°C)’ stand for?