If it's a Bureau-owned site, you can get its historic data from http://www.bom.gov.au/climate/data/
. This also picks up sites which don't report in real time (either those that send in daily reports, or those which report by mail at the end of each month).
Melrose Park is now showing up with something, but only 0.8, which suggests to me it has a problem.
Some of the real-time reporting gauges are owned by other agencies so don't go into the Bureau historical database - you can tell these on the 'dot' maps if you click on the station because they have a six-digit station number that starts with 5. In your area, Hawthorn is one of those.