I live in Canada and Brrrrrrr it gets really cold......Tonight's low is going to be around -28 Celsius....My Ducks are in the garage for the night under a heat lamp......Generally they are outside.....It is Wind that Ducks can not take and the freezing cold ground....Wind blocks and straw are all they require to remain happy......Your temps are very mild for your Ducks....They will be fine as long as they are out of the Wind and have a nice shelter........Ducks do not need water at night......I take both feed and water away when they go to bed.....I have a heated Bucket for my Ducks but they hate it, I am back to hauling water three times a day and use rubber stock bowls.......
Silly Quakers!!!
Cheers!