Why are italians so dark if they are european?

why are italians always or almost always quite dark haired and most of times olive skinned and not as white like central/northern europeans?
Update: Moi1990 i have been in italy, france and the netherlands,northern germany

The phisically difference between italians compared to dutch and northern german people is extreme...
Update 2: Mooi1990 the irish and british don't count as northern european since most of them are mixed with native britons which were depicted as being quite dark and are linked with baskes and iberians, not the case of scandinavia or holland or northern germany where most of people descend directly of germaic tribes.
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