The use of "inches" in this context is definitely a sign of family connections to the land (albeit not as close as if you'd referred to "points").
I spend enough time working with historical data to be fluent in both languages, so to speak (and sometimes keep a wary eye out for data from 1974 - the changeover year - with numbers four times what they should be).
Maybe Jenny just watches a lot of cricket, where the commentators refuse to change to the metric system.
I didn't realise we'd had that much - haven't checked the rain gauge yet.
Looks like generally 60-70mm in the Belair area (also Hawthorndene and Coromandel East), dropping to 30-40 at the base of the hills (Mitcham, Marion) and about 20 at Adelaide Airport.