BoM actually makes it quite difficult to obtain data. I looked into it once and thought it wasn't worth the trouble. Some agencies make it easier than others to obtain the raw data as it's sort of part of their mandates.
I thought it was a govt service. BOM is private?
Their datasets are great!
G-NAF for example: https://data.gov.au/dataset/ds-dga-19432f89-dc3a-4ef3-b943-5...