They say anything under 66degrees can cause root problems for the girls and they healthy as hell do you have a rain barrel catcher ? They look so healthy cold ice cold is no good you want comfortable for your hands to be in it then it should be good for those roots.. have you ever thought of a soaker hose and consistency try to water early in the morning they need that drink to start her day..I'm in southern Ontario and my girls are getting watered every other day and bites twice a week and they are doing very well.. hope this helps and cheers go Canada lol