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#1451944 - 08/02/2018 22:36 Annual Rainfall Maps for Sydney Basin
Kino Offline
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Registered: 10/08/2017
Posts: 2840
Loc: Wollongong, NSW, Aus
Hi - anyone have a good map or link for the annual rainfall map of the Sydney basin? Cheers.

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#1451960 - 09/02/2018 09:03 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Steve777 Offline
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Registered: 20/10/2011
Posts: 4490
Loc: Artarmon (Sydney North Shore)
I had a look just now but couldn't find anything nore detailed that a NSW map. The map on this page is good (scoll down), showing isohyets at 200mm intervals in wetter areas and weather district boundaries.

NSw Primary Industries Pastures

A few average rainfalls in the Sydney area (mm p.a.):

Sydney OH... 1223 (1981 - 2010)
Parramatta.... 975 (1981 - 2010)
Richmond...... 738 (1994 - 2017)
Turramurra... 1396 (1935 - 2017)

The Richmond area is in a bit of a rain shadow behind the Hornsby Plateau. Likewise the Camden - Campbelltown area behind the Illawarra Plateau. Annual rainfall in those areas is around 750-800mm.

It rains on the North Shore when it doesn't rain anywahre else, especially the higher parts around Hornsby - Berowra - around 1400mm.

The 1,000mm isohyet passes through the Western suburbs a little to the East of Bankstown and Parramatta.

The Blue Mountains are wet - with about 1,400mm at Katoomba. Averages fall away rapidly West of the Blue Mountains.


Edited by Steve777 (09/02/2018 09:12)
Edit Reason: Add detail after table.

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#1451964 - 09/02/2018 09:29 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Kino Offline
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Registered: 10/08/2017
Posts: 2840
Loc: Wollongong, NSW, Aus
Cheers Steve - very informative. I was interested in those variations etc and where is wetter and drier etc. Seems coastal or mountains are the wetter places to be.

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#1452015 - 09/02/2018 17:05 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Wave Rider Offline
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Registered: 27/01/2014
Posts: 7050
And I bet Robertson would top all those, I think I've read somehwere that the average rain there is about 1600mm/year.
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#1452020 - 09/02/2018 17:26 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Stormy3 Offline
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Registered: 12/06/2013
Posts: 1797
Loc: Ellalong,10kms SW of Cessnock ...
Gee there is some not bad looking cells starting to move in here from the SW we might get a thundery shower,WOW,The ground wont know what hit it if we do.38 deg here today.


Edited by Stormy3 (09/02/2018 17:27)
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#1452023 - 09/02/2018 17:50 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Sidney Offline
Weather Freak

Registered: 20/12/2013
Posts: 501
Loc: Macquarie fields ( South west ...
Yes robertson area should have the highest rainfall around the Illawarra area. With the amount of rainfall that must hit that area during an East coast low, along with its relatively high elevation of 750m. I wonder if there could ever be an ECL with a cold enough core that causes a massive snow dump over that area. Of cause that is just wishful thinking. smile

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#1452033 - 09/02/2018 18:59 Re: Annual Rainfall Maps for Sydney Basin [Re: Sidney]
Kino Offline
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Registered: 10/08/2017
Posts: 2840
Loc: Wollongong, NSW, Aus
Originally Posted By: Sidney
Yes robertson area should have the highest rainfall around the Illawarra area. With the amount of rainfall that must hit that area during an East coast low, along with its relatively high elevation of 750m. I wonder if there could ever be an ECL with a cold enough core that causes a massive snow dump over that area. Of cause that is just wishful thinking. smile


I went there during a decent dump in the late 80's as a kid.

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#1452803 - 15/02/2018 09:54 Re: Annual Rainfall Maps for Sydney Basin [Re: Wave Rider]
ozthunder Offline
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Registered: 23/09/2001
Posts: 3209
Loc: Mt Warrigal, NSW, Australia
Originally Posted By: Wave Rider
And I bet Robertson would top all those, I think I've read somehwere that the average rain there is about 1600mm/year.


I think Barren grounds tops Robertson by a good deal. It makes sense when you think of it. It is nearly as high, closer to ocean, but far more exposed to orographic affects and not just from the NE. With Kangaroo valley behind, even a southerly lifts.
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#1452874 - 15/02/2018 17:32 Re: Annual Rainfall Maps for Sydney Basin [Re: ozthunder]
Kino Offline
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Registered: 10/08/2017
Posts: 2840
Loc: Wollongong, NSW, Aus
Originally Posted By: ozthunder
Originally Posted By: Wave Rider
And I bet Robertson would top all those, I think I've read somehwere that the average rain there is about 1600mm/year.


I think Barren grounds tops Robertson by a good deal. It makes sense when you think of it. It is nearly as high, closer to ocean, but far more exposed to orographic affects and not just from the NE. With Kangaroo valley behind, even a southerly lifts.


Indeed that whole area (Barren Ground --> Knights Hill) averages ~2000mm a year according to a map I posted a few months ago.

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#1452875 - 15/02/2018 17:35 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Kino Offline
Weatherzone Addict

Registered: 10/08/2017
Posts: 2840
Loc: Wollongong, NSW, Aus
Found it:



Edited by Kino (15/02/2018 17:35)

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#1452894 - 15/02/2018 18:09 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Homer Offline
Meteorological Motor Mouth

Registered: 16/06/2007
Posts: 6040
Loc: Dural
That's a fascinating map Kino.
Thanks for posting.

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#1452903 - 15/02/2018 18:46 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
Steve777 Offline
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Registered: 20/10/2011
Posts: 4490
Loc: Artarmon (Sydney North Shore)
Yes Kino, very interesting.

I see it shows the Illawarra, part of the South Coast and hinterlands. It looks like it is based upon drainage basins.

What is the source? Do you have a link?

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#1452927 - 15/02/2018 20:18 Re: Annual Rainfall Maps for Sydney Basin [Re: Steve777]
Kino Offline
Weatherzone Addict

Registered: 10/08/2017
Posts: 2840
Loc: Wollongong, NSW, Aus
Originally Posted By: Steve777
Yes Kino, very interesting.

I see it shows the Illawarra, part of the South Coast and hinterlands. It looks like it is based upon drainage basins.

What is the source? Do you have a link?


It was from a DPIF report I found online re: soil moisture & growing conditions in the Shoalhaven river basin if I recall. I'll have a dig again.

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#1453428 - 19/02/2018 17:27 Re: Annual Rainfall Maps for Sydney Basin [Re: ozthunder]
Wave Rider Offline
Meteorological Motor Mouth

Registered: 27/01/2014
Posts: 7050
Originally Posted By: ozthunder
Originally Posted By: Wave Rider
And I bet Robertson would top all those, I think I've read somehwere that the average rain there is about 1600mm/year.


I think Barren grounds tops Robertson by a good deal. It makes sense when you think of it. It is nearly as high, closer to ocean, but far more exposed to orographic affects and not just from the NE. With Kangaroo valley behind, even a southerly lifts.


Absolutely, plus it's quite hilly in all directions around Robertson so that would dry out some precip. Whereas Barren Grounds/Knights Hill sticks out like a sore thumb.
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#1454106 - 23/02/2018 17:16 Re: Annual Rainfall Maps for Sydney Basin [Re: Kino]
DVC Offline
Weather Freak

Registered: 14/11/2011
Posts: 342
Loc: Goulburn NSW
Robertson and the scarps are well known high rainfall areas, what I always find amazing are the extreme totals experienced on the Illawarra escarpment at different points behind Wollongong, often leading to intense flash flooding. I remember the incredible Wongawilli totals of early 1984 - 650 mm 24 hours I think, will have to check.
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