You need much colder for this to happen. Google says:
Water vapor, even in freezing temperatures, doesn't instantly freeze into ice unless it comes into contact with a surface or the temperature drops extremely low (around -40°C).
The relative humidity goes up when the temperature goes down. The water doesn't go anywhere, but the ability of the air to hold it drops, so the relative humidity rises until it hits 100% and water starts precipitating out.
The relative humidity of the air in winter at it's coldest point during a cycle is almost always 100% where I live.
