Category Archives: Urban Heat Islands

BoM trumpets January the warmest month on record for Sydney

The BoM blah-blahs on – Every station in the metropolitan area recorded its highest January mean temperature on record and most stations (including Sydney Observatory Hill) also broke records for mean maximum and minimum temperatures.
Not a word on the above BoM page of the ever growing urban heat island driving temperatures hotter for 150 years.
I see Richmond RAAF 67105 had Jan 2017 mean max = 34.1, mean min = 20.
I only have to check historic monthly mean max and min for Richmond – UWS Hawkesbury 67021 to find that 1946 equalled the Jan 2017 max of 34.1 and smashed the min by a whole degree. So obviously all the BoM claims for last month are rendered so pathetically tenous and lineball (without plugging in a “correction for UHI”) – what a disgusting propagandist organization the BoM has become.

BoM exaggerates again Canberra hottest January

Claiming Canberra had its hottest January – Hottest January on record sees Canberra’s power usage soarCanberra Airport 70351 had Jan 2017 mean max 32.8 but Queanbeyan Bowling Club 70072 in 1932 had a Jan mean max of 34.2 –
When you examine site differences, ponder the UHI growth in the ACT – Qbn UHI in 1932 – it looks too close to call. Definitely not a worthy record for the BoM to trumpet.

Sydney record hot night – urban heat island never mentioned

Dear old Bureau of Meteorology up to usual tricks claiming a hottest evah record hot night for Sydney but ignoring the UHI. The record is not worth the paper it is printed on due to the huge urban heat island UHI.
Sydney weather: Overnight temperature is record high for December, BOM says
AWN lets you look around the region and see that the night of the 14th was warmest in the Sydney core stations, Obs Hill 27.1, Airport 27.5, Parramatta 27.5. Note RICHMOND RAAF (067105) at 23.6 further west in the UHI – the record there for Dec is 25 in 2000. The earlier RICHMOND RAAF (067033) 1928-1994 has 25.5 in 1990 as the record Dec night. All pointing to this warm night event being nothing special – unless you want to beat up global warming.

Perth heading for coldest September since at least 1906

Chris Gillham in Perth has been monitoring mean daily temperatures at Perth BoM sites and says Perth Airport 9021 is a shoo-in to have the coldest September mean since opening in 1944. Perth Metro 9225 in Mount Lawley has only been open from Jan 1994 replaced Perth Regional Office 9034 which commenced 1897 and underwent various moves before ending up in East Perth. Progress with temperature updates can be checked at AWN or the BoM.
Chris has a page discussing the history of various Perth weather stations since 1897. I will update as the final numbers are available and hope to include other Perth region sites such as Pearce – Jandakot – Medina etc It is amazing we can have a month like this in the teeth of the vast Perth urban heat island.

Sydney hottest April day last Wednesday only happened at Observatory Hill

The centre of our largest urban heat island reached 34.2 on 6 Apr 2016 topping 33.9 from 5 Apr 1986.
Other stations I have checked that were open in 1986 were all hotter in April 1986.
Sydney Airport 34.7 on 6 Apr 2016 but 35.7 on 4 Apr 1986
Bankstown AP 35.8 on 6 Apr 2016 but 36.9 on 4 Apr 1986
Parramatta Nth 35.2 on 6 Apr 2016 but 37 on 4 Apr 1986
Richmond RAAF(067105) 36.6 on 6 Apr 2016 but Richmond RAAF(067033) 38.2 on 4 Apr 1986
The ABC TV weather news was beating up Penrith but that station did not open until 1995 and there seems to be no other Penrith station – tough – what liars.

Looking at the state I have checked Goulburn, Condobolin, Cobar, Bourke – the first 3 were all hotter in Apr 1986. Bourke Post Office was hotter 3 times between 1906 and 1922. So just now I can not find that 6 April made a record hot day anywhere in NSW except Sydney Obs Hill – any suggestions? This would be remarkable.

Perth 4 days over 40°C heatwave nothing out of the ordinary for Perth heatwaves

We have all seen the media beat ups about the “Great Four day Perth heatwave 7th to 10th Feb 2016” – never a mention that that the ever expanding Perth urban heat island UHI might contribute to this event. Credit where credit is due though, the original BoM forecast was pretty good. Unlike their Brisbane and Queensland efforts this year.
Check out the statistics assembled by Chris Gillham in Perth – his website has much information on WA and Perth climate matters. Interesting that Perth Airport temperature data shows the “Great Four day Perth heatwave 7th to 10th Feb 2016” was exceeded by several past events at that site.

Uncommon example of GreenLeft Australian media mentioning the urban heat island

The Sydney Morning Herald reveals – Sydney area an ‘urban heat island’ vulnerable to extreme temperatures 14 Jan 2016 – It is welcome that such basic facts can be spoken about.
Research by the BoM 15 years ago found measurable urban effects in small Victorian centres Hamilton, Camperdown-Cobden, Colac. The BoM paper can be downloaded as a 216KB pdf-

Coldest December morning for 38 years at Kent Town in central Adelaide

Just noticed this HT Graeme No.3 – But today I see Adelaide (Kent Town) recorded 7.9°C which just beats the previous record of 8° in 1987 – data starts 1977.
Parafield Airport had 5.7 this morning – Only 0.1 above the December record minimum of 5.6 in 1995. All in the face of the increasing Adelaide urban heat island (UHI) influence.
Adelaide West Terrace 1887-1979 recorded 6.8 in 1955.

Is the Australian Bureau of Meteorology admitting to an urban heat island in Canberra ?

Ponder these quotes from the BoM to the ABC
[Bureau of Meteorology forecaster Sean Carson said temperature lows seen this week, along with last August’s extreme run of lows only occurred once a decade.
“August last year saw a pretty impressive run of overnight lows, where we saw eight consecutives nights below -5C, with the lowest night in that sequence getting all the way down to -8C,” he said.
“But prior to that it is probably something we only see every 10 to 15 years where we get such cold minimums.”
Mr Carson said this “impressive” run of temperatures was more common in the 1970s.
“It used to be fairly regular before the 1970s, before we saw a lot of development across Canberra, which did give Canberra a little bit of heat coming from industry,” he said.]
So is the non-urban classification for the Canberra Airport BoM station up for review?

From page 76 of “Techniques involved in developing the Australian Climate Observations Reference Network – Surface Air Temperature (ACORN-SAT) dataset” CAWCR Technical Report No. 049 – BoM March 2012

Evidence of urban heat island (UHI) at Cobar, New South Wales, Australia

The BoM Cobar Meteorological Office is adjoining housing on the north edge of Cobar, a mining and pastoral town in remote New South Wales population ~4,000. A BoM MO is professionally staffed.

The Airport is several km away to the SW – these minimum temperature readings for May show a UHI of a few degrees most mornings.
Obviously if mornings are too breezy – the relationship gets perturbed. You can see here that lately there are only light zephyrs in the early mornings when minimum temperatures are recorded.
The BoM classifies Cobar MO as “non-urban” – despite housing a stones throw away. Not on this planet.