This is the 3989th most frequent Dutch word.
zulk
"Zulk" means "such" or "such a."
In this sentence, 'zulk' is used to indicate the quality of the noun 'weer' (weather) in a general or unspecific manner.
Zulk mooi weer maakt iedereen vrolijk.
Such beautiful weather makes everyone happy.
'Zulk' here emphasizes the extent or magnitude of the descriptive noun phrase 'een groot huis' (a large house).
Ik heb nog nooit zulk een groot huis gezien.
I have never seen such a large house before.
Here, 'zulke' refers to a specific type or characteristic of the plural noun 'cadeaus' (gifts).