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#69528 - 02/08/2003 21:29 Climate discomfort levels/ Equable climates
tony m Offline
Weather Freak

Registered: 11/05/2003
Posts: 326
Loc: Menai (Sydney) Lat.-34.S; Long...
Looking for information on A) relative strain index; ie new list of towns/cities in Australia.

B) discussion; best equable climate in Australia,
and which formula do you use.

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#69529 - 03/08/2003 01:07 Re: Climate discomfort levels/ Equable climates
Weatherfreak24 Offline
Junior Member

Registered: 02/07/2003
Posts: 106
Loc: Perth, WA
Your best bet would be the Bureau of Meteorology, they may have some info on Relative Strain Index or Heat Discomfort, although I'm not sure if they have data for individual stations available to the public.

There is a good map on Relative Heat Discomfort in the book, 'The Australian Weather Book' which shows the number of days of heat discomfort - defined as a day when an 'average' person at normal activity feels uncomfortable - equivalent to a temperature of 27C with 80% R.humidity. The region of Australia with the highest number of heat-discomfort days is the Kimberley of Western Australia with over 220 days of heat-discomfort, while many highland areas, Tasmania, S.Vic, SA extreme SW WA have below 5 days.

Of the major capitals, here are the rough estimates:

Darwin 180
Brisbane 22
Adelaide 16
Perth 15
Canberra 12
Melbourne 10
Sydney 6
Hobart 3

A good system used is to count the number of days in which a temperature of 30C and 35C is exceeded at the station, and the mean daily maxima for January or the hottest month. The station at where which both values are lowest would obviously be the 'most comfortable' as long as values are not too low. This is by no means a climatological formulae, but obviously useful in determing how 'equable' a climate is.

For major cities (above 50,000), the 10 most pleasant places to be would be:

BY DAYS >30C

STATION >30C Jan max

Launceston, TAS 4.6 24.1
Hobart, TAS 5.9 21.5
Newcastle, NSW 13.5 25.5
Wollongong, NSW 14.4 25.6
Sydney, NSW 14.5 25.8
Geelong, VIC 24.4 25.5
Gold Coast, QLD 29.2 28.5
(Southport)
Melbourne, VIC 29.7 25.8
Canberra, ACT 35.2 28.5
Brisbane, QLD 49.8 29.2

The table is interesting in that'd you'd expect a Gold Coast summer to be far more unpleasant than summer in Melbourne, but due to Melbourne's local topography and lower-humidity/drier summers than the Gold Coast it is prone to hot air from the interior of the continent. Taking into account both no. days >30C and mean max Jan temp would be a good system.
'Equability' is a relative subject, and a few climatological studies have been carried out. Since I am not a climatologist I can't tell you much about them, but if we say the most comfortable temperature range for most people at normal activity is 15-26C, then the location in which the temperature falls most frequently within this range may be considered most 'equable.'

I personally consider coastal locations in the Southwest of WA to have Australia's mildest climate. Although if you go even a few kilometres inland summer maxima rise rapidly. Albany, WA is generally mild all the year round. The January maximum temp is a pleasantly warm 22.8, and the min in July 8.0 (a range of 14.8C). Although in winter wind-chill and rain can make it feel a tad chilly.

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#69530 - 03/08/2003 19:51 Re: Climate discomfort levels/ Equable climates
tony m Offline
Weather Freak

Registered: 11/05/2003
Posts: 326
Loc: Menai (Sydney) Lat.-34.S; Long...
Thanks for the generous infomation; much appreciated. Will check with the weather bureau
(BOM) with the upgraded RSI of Australian sites;and also find a copy of the book you mentioned 'The Australian Weather Book'.

I obtained various publications from the BOM over the last 20 years which i found very useful in my own research.

In my own travels around Australia in the 1980-1990's i observed a great constrast of weather/climates from the top end dry season/& the N.Q. summer wet; to the snow and the cool climates down south and been fascinated with the Australian climates ever since. I did stay for a while on the West Coast including Perth in the summer of 87 but did not get as far down as
Albany.

On the East Coast there is still a lot of conjecture where the best climate is and which they say is very equable (ie no very extremes; hot or cold;wet dry or too humid etc)

Some information i have received from both the BOM and other locals; pointing out the sub- tropical regions of the north coastal regions of NSW as far south as Port Macquarie/Coffs Harbour to the southern& central coasts Of Queensland to Hervey Bay; Bundaberg regions even as far as the tropical Capricorn coast east of Rockhampton.

The bureau BOM has also mentioned in a large scale "equable climates" all of the NSW coasts; and also the south west of Western Australia which you mentioned.

I suppose every body as their favourites. Mine also would be around 15-26C but as we all know; this is nearly impossible in every month of the year. I like the the "dry tropic" in the winter/spring months and NSW coasts in the summer season for the comfort level; but also the "Top End"lightning and tropical storms in the summer season in Darwin& N.Q. where we most all know the air conditioner is great demand

I would like to visit Western Australia (WA) again and a must be is the Albany; Margaret River; Bunbury regions, thanks again for your information. (South West; Western Australia)

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#69531 - 03/08/2003 22:52 Re: Climate discomfort levels/ Equable climates
Jacob Offline
Meteorological Motor Mouth

Registered: 17/09/2001
Posts: 6288
Loc: Sydney, NSW
RDI% (relative discomfort index) is interesting and has a peak near Derby, WA. The place is surrounded by hot mud flats, savannah and swamplands, the DP sits only a few degrees below the temp during the wet season, and most storms skip to the north or SE of the town. I lived there for the experience.. and geeeeeeeez. Even the tap water is hot and steamy! Darwin is like Tasmania compared..

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#69532 - 04/08/2003 08:47 Re: Climate discomfort levels/ Equable climates
Redsky@nite Offline
Weatherzone Addict

Registered: 21/01/2002
Posts: 1457
Loc: Lismore by day /Alstonville by...
I know that our local council advertises our area as having the most livable climate in Australia. It would be due to mild winters and warm summers with lovely afternoon sea breezes. We are far enough south not to have tropical cyclones and far enough north to miss most of the clout of the cold fronts that rip through the south east. We still get the severe thunderstorms but everyone does. I certainly like living here. We have worn t-shirts throughout winter this year (we had winter last week, twas a bit cold)! I wouldn't live anywhere else.
_________________________
Red sky at night Sailors delight, red sky at morning Sailors take warning

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#69533 - 04/08/2003 09:35 Re: Climate discomfort levels/ Equable climates
Dave-Wx Offline
Weatherzone Addict

Registered: 27/08/2001
Posts: 4950
Loc: Heritage Park, Brisbane, QLD
Actually, the CSIRO in 2000 rated Coffs Harbour as the most livable climate in Australia. :p

But it is hard to tell the difference living anywhere between, say, Ballina and here. I reckon its only about a degree or two cooler here than back in Coffs.

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#69534 - 04/08/2003 12:49 Re: Climate discomfort levels/ Equable climates
Jacob Offline
Meteorological Motor Mouth

Registered: 17/09/2001
Posts: 6288
Loc: Sydney, NSW
Sounds nice there, Ive passed thru, but never had the chance to stay in Coffs.. My uncle has a property north of Lismore, but south of Nimbin, I know the temps are ok there, being inland tho it does heat up a tad and cool down, flooding becomes an issue too..

I personally like it up here, but I certainly wouldnt call it a 'liveable' climate LOL. Some days are so oppressive, I hate the days when you are in air cond. all day, step outside, and your skin gets wet from condensation.. eeek..

But being a slim guy with a busted thermostat, it does me fine :cheers:

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#69535 - 04/08/2003 20:58 Re: Climate discomfort levels/ Equable climates
tony m Offline
Weather Freak

Registered: 11/05/2003
Posts: 326
Loc: Menai (Sydney) Lat.-34.S; Long...
A friend of mine works for the Sydney office of the BOM who told me " that Port Macquarie is in own opinion the best livable 'equable' climate in Australia from his own records in the Bureau,"

So The Port Girl is correct. I have travelled through Port Macquarie a few times travelling up and down the coast; but i have never stayed for a visit.(but is it true that most of the rain/storms happen late evenings or night? as my friend at the BOM Sydney office told me.

I have stayed heaps of times in "Coffs" (Coffs Harbour) and really like the weather there, but it can a bit "Sultry" ie very warm and humid in the summer months esp. in late JAN -FEB; the same as Byron Bay; Ballina, Yamba, and very warm to hot in the inland centres Murwillumbah, Grafton, Lismore, Casino; and other inland districts of the NSW mid and far north coast(northern rivers) regions.

My Dad was born and raised in Grafton, and "says it has the best climate in the world;" but that is from my old pop's opinion. A uncle of mine used to live in Dorrigo in the plateau mountains behind Bellingen and he liked it because of the mountain elevation in the summer months (less humid of the coastal strip; ie Coffs, Bellingen, Urunga;) and not as cold in the winter months as the New England districts (Armidale,Glen Innes, Uralla,Emmaville;) where both of my grandparents were born.

When I did my travels I did stay in the Kimberley Districts at Kununurra (endless or two summers they call it) at Derby; yes it is mostly hot and humid and dew point nearly the same in summer months with the mangrove mud flats; and the tide goes out for ever and with mozzies and sandflies every where. (don't forget the aeroguard) Loved Broome; Cable Beach and the weather of course! (should have stayed longer) the same as Carnarvon and Katherine in the Top End N.T.

I get the travelling bug typing this message.
Next two weeks going up to Townsville for my winter holiday break where they say it is the most sunniest place on the East Coast, great fishing too and over at Magnectic Island.

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#69536 - 04/08/2003 21:22 Re: Climate discomfort levels/ Equable climates
tony m Offline
Weather Freak

Registered: 11/05/2003
Posts: 326
Loc: Menai (Sydney) Lat.-34.S; Long...
To Jacob; Darwin N.T.
Is the RDI and the RSI the same or similiar scale? Is this from the Australian Weather Book?
If not where could i find this condensed info without having to look it up in the "Climatic Averages of Australia"

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#69537 - 04/08/2003 21:39 Re: Climate discomfort levels/ Equable climates
Dave-Wx Offline
Weatherzone Addict

Registered: 27/08/2001
Posts: 4950
Loc: Heritage Park, Brisbane, QLD
Quote:
Originally posted by tony m:
A friend of mine works for the Sydney office of the BOM who told me " that Port Macquarie is in own opinion the best livable 'equable' climate in Australia from his own records in the Bureau,"

So The Port Girl is correct. I have travelled through Port Macquarie a few times travelling up and down the coast; but i have never stayed for a visit.(but is it true that most of the rain/storms happen late evenings or night? as my friend at the BOM Sydney office told me.

I have stayed heaps of times in "Coffs" (Coffs Harbour) and really like the weather there, but it can a bit "Sultry" ie very warm and humid in the summer months esp. in late JAN -FEB; the same as Byron Bay; Ballina, Yamba,
Err no... you're wrong wink just kidding mate! There would be an ever so slight difference in the climate stats between the two towns, and in fact i'd wager that Port and surrounding coastal towns would be just as sultry in summer as all the way up to Ballina. And yes I have visited Port a few times, unlike most other towns that my family have visited, in the summer AND winter.

Port Girl and I both know about the Coffs vs Port things going on all the time, and i'd say she'd agree with me when I say that its impossible to split the two in just about every area. They're both quite liveable places - except I've grown up in Coffs so naturally I have a soft spot for supporting my town! smile

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#69538 - 05/08/2003 14:23 Re: Climate discomfort levels/ Equable climates
Redsky@nite Offline
Weatherzone Addict

Registered: 21/01/2002
Posts: 1457
Loc: Lismore by day /Alstonville by...
Tony m, during summer, we do seem to have rain in the evenings and the days are beautiful with an afternoon sea breeze. It can get humid here for a couple of days per year but having grown up in the western suburbs of Sydney, its not anywhere near as horrid. The sea breeze is our saviour. Dave-Wx is right, there is a fair bit of rivalry between Port and Coffs (we were Australia's first resort!) but I believe there are subtle climate differences to the two towns. Coffs is bounded from behind by it's hills and I believe that this traps the moisture and humidity a bit more than here. We have mountains (hills) too but they are 20-30 kilometres from Port, giving us more open topography for the movement of air. Looking at night on the TV weather, Port and Coffs don't generally have the same temps. Coffs seems a little hotter and has less diernal range in it's temps. It believe this is related to it's topography.

If population growth has any say, Port Macquarie has the highest growth rate in NSW and our local government area now contains more people than Coffs. Just thought I would fuel the rivalry! laugh ** said in good natured tone** wink wink
_________________________
Red sky at night Sailors delight, red sky at morning Sailors take warning

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#69539 - 05/08/2003 16:21 Re: Climate discomfort levels/ Equable climates
Dave-Wx Offline
Weatherzone Addict

Registered: 27/08/2001
Posts: 4950
Loc: Heritage Park, Brisbane, QLD
Haha - very true. Port is currently ahead in its local government population, though its usually a seesawing battle of a few hundred people.

Good point about the topography though. I'm pretty sure Coffs usually is about 1 degree higher during the day than Port, though i'm not as familiar with the minimums.

It (Port) is also the fastest growing retirement village in NSW. :p

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#69540 - 06/08/2003 14:14 Re: Climate discomfort levels/ Equable climates
Redsky@nite Offline
Weatherzone Addict

Registered: 21/01/2002
Posts: 1457
Loc: Lismore by day /Alstonville by...
Actually, the highest growth rate in Port is in the young family bracket with the 30 somethings leaving the big smoke and moving to a more affordable town. All the retirees are moving to Laurieton....... Haven't meant to turn this into a tit for tat about Coffs and Port Macquarie. There really is not a lot of difference, climate wise between the two towns. :cheers: Dave-Wx
_________________________
Red sky at night Sailors delight, red sky at morning Sailors take warning

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#69541 - 06/08/2003 17:10 Re: Climate discomfort levels/ Equable climates
Dave-Wx Offline
Weatherzone Addict

Registered: 27/08/2001
Posts: 4950
Loc: Heritage Park, Brisbane, QLD
Yeah the young family bracket leaving the city probably applies for the whole coast from Newcastle north to the Tweed - I know that a lot of people from around here go to Nelson Bay often, or go to live there.

At least we can just about lay claim to having the best storms in NSW nearby to where we live (i'm defintely coming back to Coffs for the summer holidays laugh )

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#69542 - 08/08/2003 23:04 Re: Climate discomfort levels/ Equable climates
Weatherfreak24 Offline
Junior Member

Registered: 02/07/2003
Posts: 106
Loc: Perth, WA
What about Byron Bay, NSW? Winters here are considerably warmer and summers only marginally hotter than Coffs Harbour.

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#69543 - 09/08/2003 13:14 Re: Climate discomfort levels/ Equable climates
tony m Offline
Weather Freak

Registered: 11/05/2003
Posts: 326
Loc: Menai (Sydney) Lat.-34.S; Long...
Hello Weatherfreak 24. Byron Bay is beautifiul place in the weather/climate department; the geography/landscape hills and mountains; and the people of the district from all different persausions and backgrounds.

My sister lives in the Byron Bay district and adores it. She is into organic grown vegetables and fish diet and finds it an interesting place to live. I found the summer climate though a bit more humid than Coffs Harbour ( the Humidity in the summer months at Byron Bay at 9AM around 80% to approx. 70% in the afternoons;) but who cares! :rolleyes: if you like the area or on holidays or holiday mode all the time that is a paradise area. :wave:

But as we all know from other chats; NSW north coast, and southern-central Queesland are all sub-tropical paradise havens. wink smile

Tony m :cheers:

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