Finding patterns in a database

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Hello I have a very confusing problem for me that I am really struggling with



Here is the problem:

I have a database which includes 1500 cities. Each city has 3 type of characteristic and a value.

My intention is to group cities together which have very similar values (around +-50), and to see the patterns behind values based on 3 characteristics. As you see, we can search for 7 possibilities (2&3, 1&2, 1, 1&2&3...)

I want to infer something like this: "The cities which have very similar values (around +-50), show us that characteristic-2 and characteristic-3 of those cities are the same"

What should I do?