I suppose it doesn’t rain much in your area? Buttons tend to work even when moist. Touch screens tend to give you the wrong amount of money out of your bank account.
This varies widely depending on the issuer of the ATM, at least in my part of the EU (SW Germany).
My banking group has (I guess) >90% of their ATMs indoors; I can only think of ever using 4 or 5 locations that were outdoors (my dataset is probably something like 100 ATMs). But there are also some banks which seem to favour outdoor, or at least have less of a strict "indoor policy".
Especially "generic" ATMs at tourist spots or train stations seem to be outdoors.