This is the 880th most frequent Finnish word.
millainen
"Millainen" means "what kind of" or "what type of" in English.
Here, 'millainen' is used to inquire about the quality or characteristics of the weather.
Millainen ilma siellä on tänään?
What is the weather like there today?
Here, 'millainen' prompts an explanation or depiction of personality traits or characteristics of a person.
Voisitko kuvata, millainen ihminen hän on?
Could you describe what kind of person he/she is?
'Millainen' is used as a question word asking about the description of the weather.