Oh jaa, back in the good old days...
Is cold "kaldt" here because it pertains to "det"?
Men det er kaldt hver måned i Norge...
Det er vaaaarm i Topeka
Why 'There is cold in December' is wrong,
That sentence doesn't work in English because 'cold' isn't a noun (except for 'a cold' when someone is ill).
"Cold" here is describing the weather or the temperature, so the "it" is standing in for those nouns.
Why do we use det/kaldt here and not den/kald? Which word does the neuter correspond to?
Ikke kald nok