I'm not the original poster. This post was copied from a weather page I'm a member of. I did ask permission to share this.
So we are a week into July....the depths of winter and the 'Dry'. Well we all know ( at least Northern and Western Top End ) what to expect re rainfall and temperatures,,,,er.... don't we ?
Even dry July can throw up an anomaly or 3 if you go back and have a look at the historical records for the Airport and Post Office sites.
The 'average' mean rain for July is 1.1mm, but the 5th and 10th percentile is 0.0mm as is the median. So yes, any precipitation in July is out of the ordinary. Of course it does happen infrequently.
22 July's since 1941 have recorded measurable rain ( 0.2mm or more ) at the Airport.
17 July's in 86 years at the Post Office site ( some missing data during ww2 )
The Airport hasn't recorded July rain since 2010 ( 0.2mm ) and prior to that 2003 ( also 0.2mm )
I can recall an older bloke telling me of a July fall when the cricket match he was playing in was washed out at Gardens Oval ( that was a 10mm fall at the Botanical Gardens in 1978 ).
The big July fall that many of us will remember was in 2001, a heavy thunderstorm of all things ( im ) possible. I was working in a mate's yard at the 11 mile. Flooded the yard with 15mm in about an hour ! In July ! Thunder and lightning ! In July !
That day is up there in my Darwin weather memories just for the novelty factor of a July thunderstorm !
Airport scored 26.6mm over 2 days, Gardens 31.8mm. Parap 33.4mm, Coconut grove 24.7mm, Leanyer 20.8mm, RAAF 11 mile 21.9mm, Hospital Tiwi 18.8mm, Karama 24.8mm, Channel Is. 11.4mm, CSIRO Berrimah 18.8mm, Humpty Doo 12.6mm, Girraween 10.8mm, Marlow Lagoon 22.0mm
So that was nice consistent rain over 2 days for just about all of the City and 'Burbs.
And how good must have been the first 3 days of July 1900 when 65mm fell, including a 43.4mm fall on the 2nd ? I reckon that might even have fooled the green tree frogs !
I wonder if was a North West cloud band, or gulflines from the East, or just some nice convection over the 3 days ?