The University of Manchester is doing some research into clouds are made. Leah took a closer look to see exactly how the experiment works.
For the conditions to be right to make clouds the scientists have to the lower the temperature to about minus 20 degrees inside the chamber.
The scientists make the clouds by using putting steam inside the chamber - a bit like a giant kettle.
Inside the chamber, which is taller than a normal house, are lots of cameras. So the scientists can use a computer to see if the experiment is working.
This time the experiment has made tiny ice particles so it looks like it's snowing.