I don’t understand your question: what do you mean “associates” in chemistry? Do you mean an associates degree from a community college?
Why wouldn’t you study chemistry as an undergraduate if you want to get a master’s in chemistry?
If you do get a BS in meteorology and then want to do a master’s in chemistry, you may need to pick up additional courses at a 4-year university to meet all the requirements for graduate work in chemistry. You will find requirements for master’s programs on school websites.