The weather we have is caused by an interplay of a large number of different properties of the atmosphere. As the atmosphere moves, these properties change, and this makes the weather change at a particular location.
Shaw, R. H. and Elford, C. R.
"Why Our Weather Changes,"
Iowa Farm Science: Vol. 13
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol13/iss1/3