It's -- fine weather that we can go out.用so fine 还是such fine

It's ____ fine weather that we can go out for a walk. it is such fine a day that we all want to go out for a walk it is such fine day that we can't help going out to enjoy ou It's such nice weather that we can go out if it's fine tomorrow,we'll go out..和if it were fine tomorro such fine weather和so fine weather 哪个正确? such fine weather,为什么不能说so fine weather so fine weather是否等于such fine weather? 说“天真好”时应该是so fine weather还是such fine weather? We have never had ----------fine weather.中应用so还是such We had such fine w that we decided to go out for a walk that's fine.we'll take it.