This is the 10373rd most frequent Swedish word.
kalt
Cold.
Here, "kallt" is used as an adjective describing the temperature outside.
Det är kallt utomhus idag.
It is cold outside today.
In this sentence, "kall" is modifying the noun "dusch" (shower) meaning its temperature is cold.
Han tog en kall dusch efter träningen.
He took a cold shower after the workout.
"Kall" is used as an adjective describing the state of the drink as it was served, emphasizing its cooled temperature.