It is my humble opinion that Australian Bureau of Meteorology is the best in the world. They have continuos data as far back as 1860s. I know that our South Australian environment is very arid similar to that of Arizona, USA. It is the driest State in Australia. It only rains in Winter (now) and is without rain for the rest of the year. See the South Australian annual hydro cycle in any good Atlas. The rest it is your job that is all.