Muhammad Mudassar Muhammad, what you're asking does not have an "this-is-best" answer. Instead "speak to your audience" with methods of analysis, a technical and cultural language and graphic representation that they will understand -and- make then graphically present information you care about in same way. - You should tailor all the above to your research field. In other words the particular tools and representation technique doesn't matter You need to compare what you want to communicate from the variables. Is it best to show all three variables together or separately ??? Is it best to communicate monthly trends to your audience in one study or separately ?? Do monthly variable trends make the data clearer than yearly trends ?? Graphic representation of data is a form of visual communication. Do you know how to use this form of communication to make the ideas you care about clear to your audience ???

I ask these questions because your question reads like your trying to show-off your ability to handle complex data versus communicate with people. In my culture we have a baseball (sports) expression; "do simple better". I think that applies here. Work to make a simple and concise presentation of the trends. Using a language, tools and techniques you know.