Well, I move mine out about 3 weeks. I am finding that they are much sturdier than I at first thought. The real question is, what are you moving them into? If is a good coop, where they can get out of the wind, they will keep themselves warm.
I would suggest deep bedding, so that they can snuggle down into a pile at night.
I do agree with the idea of putting them outside for an hour or so, then a warm up, then a little longer, then a warm up.
I do have my brooder set up so that there is a much warmer area and a much colder area, where I keep the food and water, so that they move from one to the other. This encourages feathering earlier.
At those temperatures, I would put them out and keep an eye on them, but no need to wait another two weeks. If the temperatures were below freezing in the daytime, I would hesitate, but not with those expected temperatures. I would not worry about it.
Keep an eye on them, chicks scurrying around, exploring, jumping up on things looking like kids at recess are doing fine. Broody hens let their chicks run around in real cold temperature, but have a spot to warm up too. A good wind break will be that.
Mrs K