Australia ACORN-SAT series entire station audit
Australia ACORN-SAT temperature fraction audit
This page presents an audit of temperature fractions over the entire history of all weather stations in the ACORN-SAT dataset, including recordings before 1910 and some dating back to the 1860s. The results are slightly different from the audit of precise timeframes beginning 1910 in the ACORN-SAT dataset.
Within the ACORN-SAT series of minimum and maximum temperature records at 112 locations comprising 201 Australian weather stations maintained by the BoM, 30% of all raw temperatures were logged as a whole .0 Fahrenheit degree before Celsius metrication on 1 September 1972 - including recordings from the 1800s.
This compares with 31.04% of all Australian temperatures recorded as .0 Fahrenheit before September 1972 in the High Quality temperature series and 25.5% in New Zealand's Seven Station series. The correct proportion should be around 10%.
Within the ACORN-SAT weather station records, 17.8% of all raw temperatures were logged as a whole .0 Celsius degree since Celsius metrication on 1 September 1972 to 31 December 2011.
This compares with 19.47% of all Australian temperatures recorded as .0 Celsius since September 1972 in the High Quality temperature series and 13.2% in New Zealand's Seven Station series. The correct proportion should be around 10%.
Combined, Australia's ACORN-SAT and High Quality series totalled 30.7% of 4,897,826 Fahrenheit temperatures recorded as .0F from the 1800s to September 1972 and 19.1% of 5,274,002 Celsius temperatures recorded as .0C since 1 September 1972.
The Australian Climate Observations Reference Network – Surface Air Temperature (ACORN- SAT) dataset is a long-term record of Australian daily air temperature, covering the period from 1910 to the present at 112 locations comprising 201 weather stations.
The ACORN-SAT dataset estimates that for temperatures across 1911-2010, Australia's annual maximum increased 0.75C, its annual minimum by 1.14C and its annual mean by 0.94C.
The raw temperature source of the ACORN-SAT dataset audited in this presentation includes 3,896,815 minimum and maximum Fahrenheit temperatures recorded at 138 weather stations from the 1800s to September 1972 and 3,371,271 minimum and maximum Celsius temperatures recorded at 195 weather stations from 1 September 1972 to 31 December 2011, totalling 7,268,086 temperature recordings.
In the Fahrenheit era from the 1800s to September 1972, 30% of all temperatures recorded at the 138 relevant weather stations were logged as .0F degrees (rather than a tenth fraction such as .3 or .8).
The combined 30.9% of temperatures recorded as .9F and .1F infers an actual .0F ratio above 40%.
In the Celsius era from 1 September 1972 to 31 December 2011, 17.8% of all temperatures recorded at all 195 relevant weather stations within the ACORN-SAT dataset were recorded as .0C degrees.
This compares with 19.5% of all Australian temperatures recorded as .0 Celsius since September 1972 in the High Quality temperature series. The correct proportion should be around 10%.
Click temperatures for tenth fractional charts in Fahrenheit or Celsius
When all weather stations including preceding and neighbouring sites in the ACORN-SAT series are combined with all in the High Quality series, the 312 sites together had 30.7% of Fahrenheit temperatures recorded as .0F before September 1972 - see chart.
Combined, all ACORN-SAT and HQ stations together had 19.1% of Celsius temperatures recorded as .0C since September 1972 - see chart.
All ACORN-SAT and HQ weather stations combined had 4,897,826 recordings of Fahrenheit temperatures from the 1800s to September 1972 and 5,274,002 recordings of Celsius temperatures after September 1972, totalling 10,171,828 recordings.
Note: This audit of Australian weather station temperature records was possible due to the Excel programming skills of former ABS statistician Ian Hill and chemical engineer Ed Thurstan.
Western Australia ACORN-SAT audit
New Zealand Seven
New Zealand Eleven