This is the 950th most frequent German word.
normal
Conforming to a standard; usual, typical, or expected.
Here, 'normal' is used as an adjective to describe the usual or expected state of the weather.
Das Wetter ist heute ganz normal.
The weather is quite normal today.
In this sentence, 'normal' functions as a predicate adjective, indicating what is expected or common in a given situation.
Es ist normal, dass man sich vor einer Prüfung nervös fühlt.
It is normal to feel nervous before an exam.
Here, 'normal' is used as an adverb (informally shortened from 'normalerweise'), describing the manner of operation.