Take the monthly data and ...

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Take the monthly data and each month divide by 30 for an average on that station. Start taking daily readings from now on.   If you want to guess on the coming rainfall I am sure there are many models that require money and educated guessing.   You control the rain in your area. basic science using microbes id the answer.  The biggest deserts can become ag fields and forests in about 5 years.  Just need to start.  Not difficult and no funding. Nature does the work. You provide the waste.  Enjoy.