Should I water 5 day old concrete during the day when the high will be 50 and the low will drop to 31 in the evening. I am afraid of the surface freezing from any residual water. From what I read on the internet, the compressive strength has reached about 60 percent. I watered it for the first 4 days when the nightly low was above 41. Should I resume watering it when this cold front has passes and the highs get back into the 60s and the lows in the 40s? Thanks for your advice.