Western Australia temperature archive since 2009Below archives rolling 12 month average temperatures recorded at Western Australia's 30 oldest weather station locations since 2009. Year to March 2009 min .27C above the early 1900s max .68C above the early 1900s Year to April 2009 min .30C above the early 1900s max .79C above the early 1900s Year to May 2009 min .24C above the early 1900s max .76C above the early 1900s Year to June 2009 min .28C above the early 1900s max .71C above the early 1900s Year to July 2009 min .33C above the early 1900s max .70C above the early 1900s Year to August 2009 min .54C above the early 1900s max .77C above the early 1900s Year to September 2009 min .47C above the early 1900s max .65C above the early 1900s Year to October 2009 min .43C above the early 1900s max .65C above the early 1900s Year to November 2009 min .53C above the early 1900s max .92C above the early 1900s Year to December 2009 min .58C above the early 1900s max 1.09C above the early 1900s Year to January 2010 min .55C above the early 1900s max 1.16C above the early 1900s Year to February 2010 min .60C above the early 1900s max 1.27C above the early 1900s Year to March 2010 min .76C above the early 1900s max 1.36C above the early 1900s Year to April 2010 min .80C above the early 1900s max 1.34C above the early 1900s Year to May 2010 min .86C above the early 1900s max 1.28C above the early 1900s Year to June 2010 min .80C above the early 1900s max 1.29C above the early 1900s Year to July 2010 min .74C above the early 1900s max 1.30C above the early 1900s Year to August 2010 min .63C above the early 1900s max 1.25C above the early 1900s Year to September 2010 min .63C above the early 1900s max 1.32C above the early 1900s Year to October 2010 min .56C above the early 1900s max 1.32C above the early 1900s Year to November 2010 min .57C above the early 1900s max 1.35C above the early 1900s Year to December 2010 min .60C above the early 1900s max 1.22C above the early 1900s Year to January 2011 min .67C above the early 1900s max 1.15C above the early 1900s Year to February 2011 min .71C above the early 1900s max 1.01C above the early 1900s Year to March 2011 min .69C above the early 1900s max .93C above the early 1900s Year to April 2011 min .67C above the early 1900s max .94C above the early 1900s Year to May 2011 min .69C above the early 1900s max .92C above the early 1900s Year to June 2011 min .74C above the early 1900s max .93C above the early 1900s Year to July 2011 min .87C above the early 1900s max .95C above the early 1900s Year to August 2011 min .96C above the early 1900s max 1.03C above the early 1900s Year to September 2011 min .94C above the early 1900s max 1.04C above the early 1900s Year to October 2011 min 1.06C above the early 1900s max .97C above the early 1900s Year to November 2011 min 1.03C above the early 1900s max .82C above the early 1900s Year to December 2011 min 1.08C above the early 1900s max 0.86C above the early 1900s Year to January 2012 min 1.06C above the early 1900s max .80C above the early 1900s Year to February 2012 min .97C above the early 1900s max .85C above the early 1900s Year to March 2012 min .86C above the early 1900s max .85C above the early 1900s Year to April 2012 min .83C above the early 1900s max 0.86C above the early 1900s Year to May 2012 min .75C above the early 1900s max .94C above the early 1900s Year to June 2012 min .76C above the early 1900s max .94C above the early 1900s Year to July 2012 min .54C above the early 1900s max .95C above the early 1900s Year to August 2012 min .46C above the early 1900s max 0.97C above the early 1900s Year to September 2012 min .53C above the early 1900s max 1.06C above the early 1900s Year to October 2012 min .52C above the early 1900s max 1.21C above the early 1900s Year to November 2012 min .50C above the early 1900s max 1.23C above the early 1900s Year to December 2012 min .51C above the early 1900s max 1.33C above the early 1900s Year to January 2013 min .52C above the early 1900s max 1.41C above the early 1900s Year to February 2013 min .55C above the early 1900s max 1.53C above the early 1900s Year to March 2013 min .60C above the early 1900s max 1.44C above the early 1900s Year to April 2013 min .77C above the early 1900s max 1.55C above the early 1900s Year to May 2013 min .90C above the early 1900s max 1.48C above the early 1900s Year to June 2013 min .87C above the early 1900s max 1.48C above the early 1900s Year to July 2013 min 0.99C above the early 1900s max 1.50C above the early 1900s Year to August 2013 min 1.13C above the early 1900s max 1.52C above the early 1900s Year to September 2013 min 1.23C above the early 1900s max 1.45C above the early 1900s Year to October 2013 min 1.19C above the early 1900s max 1.40C above the early 1900s Year to November 2013 min 1.30C above the early 1900s max 1.51C above the early 1900s Year to December 2013 min 1.21C above the early 1900s max 1.47C above the early 1900s Year to January 2014 min 1.16C above the early 1900s max 1.43C above the early 1900s Year to February 2014 min 1.11C above the early 1900s max 1.31C above the early 1900s Year to March 2014 min 1.16C above the early 1900s max 1.45C above the early 1900s Year to April 2014 min 1.01C above the early 1900s max 1.33C above the early 1900s Year to May 2014 min 1.08C above the early 1900s max 1.35C above the early 1900s Year to June 2014 min 1.03C above the early 1900s max 1.37C above the early 1900s Year to July 2014 min 1.07C above the early 1900s max 1.36C above the early 1900s Year to August 2014 min 1.03C above the early 1900s max 1.41C above the early 1900s Year to September 2014 min 1.02C above the early 1900s max 1.54C above the early 1900s Year to October 2014 min 1.09C above the early 1900s max 1.58C above the early 1900s Year to November 2014 min 1.00C above the early 1900s max 1.53C above the early 1900s Year to December 2014 min .97C above the early 1900s max 1.47C above the early 1900s Year to January 2015 min .96C above the early 1900s max 1.49C above the early 1900s Year to February 2015 min 1.07C above the early 1900s max 1.66C above the early 1900s Year to March 2015 min 1.05C above the early 1900s max 1.56C above the early 1900s Year to April 2015 min 1.02C above the early 1900s max 1.42C above the early 1900s Year to May 2015 min .79C above the early 1900s max 1.34C above the early 1900s Year to June 2015 min .89C above the early 1900s max 1.45C above the early 1900s Year to July 2015 min .92C above the early 1900s max 1.47C above the early 1900s Year to August 2015 min .90C above the early 1900s max 1.33C above the early 1900s Year to September 2015 min .76C above the early 1900s max 1.30C above the early 1900s Year to October 2015 min .81C above the early 1900s max 1.42C above the early 1900s Year to November 2015 min .91C above the early 1900s max 1.52C above the early 1900s Year to December 2015 min .93C above the early 1900s max 1.55C above the early 1900s Year to January 2016 min 1.01C above the early 1900s max 1.49C above the early 1900s Year to February 2016 min .89C above the early 1900s max 1.39C above the early 1900s Year to March 2016 min 0.98C above the early 1900s max 1.42C above the early 1900s Year to April 2016 min 1.09C above the early 1900s max 1.51C above the early 1900s Year to May 2016 min 1.19C above the early 1900s max 1.56C above the early 1900s Year to June 2016 min 1.17C above the early 1900s max 1.39C above the early 1900s Year to July 2016 min 1.13C above the early 1900s max 1.30C above the early 1900s Year to August 2016 min 1.05C above the early 1900s max 1.21C above the early 1900s Year to September 2016 min .99C above the early 1900s max .98C above the early 1900s Year to October 2016 min .76C above the early 1900s max .69C above the early 1900s Year to November 2016 min .62C above the early 1900s max .65C above the early 1900s Year to December 2016 min .59C above the early 1900s max .59C above the early 1900s Year to January 2017 min .44C above the early 1900s max .56C above the early 1900s Year to February 2017 min .40C above the early 1900s max .38C above the early 1900s Year to March 2017 min .28C above the early 1900s max .32C above the early 1900s Year to April 2017 min .13C above the early 1900s max .34C above the early 1900s Year to May 2017 min .09C above the early 1900s max .42C above the early 1900s Year to June 2017 min .00C above the early 1900s max .60C above the early 1900s Year to July 2017 min .01C above the early 1900s max .70C above the early 1900s Year to August 2017 min .08C above the early 1900s max .80C above the early 1900s Year to September 2017 min .21C above the early 1900s max .96C above the early 1900s Year to October 2017 min .30C above the early 1900s max 1.04C above the early 1900s Year to November 2017 min .41C above the early 1900s max 1.02C above the early 1900s Year to December 2017 min .45C above the early 1900s max 1.08C above the early 1900s Year to January 2018 min .51C above the early 1900s max 1.07C above the early 1900s Year to February 2018 min .55C above the early 1900s max 1.08C above the early 1900s Year to March 2018 min .63C above the early 1900s max 1.21C above the early 1900s Year to April 2018 min .70C above the early 1900s max 1.29C above the early 1900s Year to May 2018 min .68C above the early 1900s max 1.34C above the early 1900s Year to June 2018 min .72C above the early 1900s max 1.22C above the early 1900s Year to July 2018 min .75C above the early 1900s max 1.27C above the early 1900s Year to August 2018 min .65C above the early 1900s max 1.18C above the early 1900s Year to September 2018 min .58C above the early 1900s max 1.17C above the early 1900s Year to October 2018 min .65C above the early 1900s max 1.15C above the early 1900s Year to November 2018 min .52C above the early 1900s max 1.01C above the early 1900s Year to December 2018 min .52C above the early 1900s max 1.03C above the early 1900s Year to January 2019 min .49C above the early 1900s max 1.11C above the early 1900s Year to February 2019 min .50C above the early 1900s max 1.31C above the early 1900s Year to March 2019 min .51C above the early 1900s max 1.30C above the early 1900s Year to April 2019 min .46C above the early 1900s max 1.23C above the early 1900s Year to May 2019 min .38C above the early 1900s max 1.17C above the early 1900s Year to June 2019 min .38C above the early 1900s max 1.18C above the early 1900s Year to July 2019 min .34C above the early 1900s max 1.17C above the early 1900s Year to August 2019 min .37C above the early 1900s max 1.30C above the early 1900s Year to September 2019 min .45C above the early 1900s max 1.42C above the early 1900s Year to October 2019 min .43C above the early 1900s max 1.54C above the early 1900s Year to November 2019 min .50C above the early 1900s max 1.78C above the early 1900s Year to December 2019 min .66C above the early 1900s max 2.05C above the early 1900s Year to January 2020 min .70C above the early 1900s max 2.01C above the early 1900s Year to February 2020 min .80C above the early 1900s max 1.94C above the early 1900s Year to March 2020 min .80C above the early 1900s max 1.91C above the early 1900s Year to April 2020 min .94C above the early 1900s max 1.97C above the early 1900s Year to May 2020 min 1.02C above the early 1900s max 1.91C above the early 1900s Year to June 2020 min 1.11C above the early 1900s max 2.04C above the early 1900s Year to July 2020 min 1.13C above the early 1900s max 2.08C above the early 1900s Year to August 2020 min 1.20C above the early 1900s max 2.06C above the early 1900s Year to September 2020 min 1.27C above the early 1900s max 2.01C above the early 1900s Year to October 2020 min 1.25C above the early 1900s max 1.96C above the early 1900s Year to November 2020 min 1.26C above the early 1900s max 1.78C above the early 1900s Year to December 2020 min 1.10C above the early 1900s max 1.48C above the early 1900s Year to January 2021 min 1.14C above the early 1900s max 1.52C above the early 1900s Year to February 2021 min .99C above the early 1900s max 1.39C above the early 1900s Year to March 2021 min .98C above the early 1900s max 1.35C above the early 1900s Year to April 2021 min .90C above the early 1900s max 1.35C above the early 1900s Year to May 2021 min 1.04C above the early 1900s max 1.39C above the early 1900s Year to June 2021 min .95C above the early 1900s max 1.17C above the early 1900s Year to July 2021 min 1.05C above the early 1900s max 1.08C above the early 1900s Year to August 2021 min 1.03C above the early 1900s max 1.11C above the early 1900s Year to September 2021 min .92C above the early 1900s max 1.05C above the early 1900s Year to October 2021 min .79C above the early 1900s max .88C above the early 1900s Year to November 2021 min .71C above the early 1900s max .83C above the early 1900s Year to December 2021 min .73C above the early 1900s max .92C above the early 1900s Year to January 2022 min .73C above the early 1900s max .96C above the early 1900s Year to February 2022 min .82C above the early 1900s max 1.18C above the early 1900s Year to March 2022 min .84C above the early 1900s max 1.23C above the early 1900s Year to April 2022 min .83C above the early 1900s max 1.12C above the early 1900s Year to May 2022 min .78C above the early 1900s max 1.12C above the early 1900s Year to June 2022 min .87C above the early 1900s max 1.21C above the early 1900s Year to July 2022 min .70C above the early 1900s max 1.22C above the early 1900s Year to August 2022 min .66C above the early 1900s max 1.14C above the early 1900s Year to September 2022 min .73C above the early 1900s max 1.06C above the early 1900s Year to October 2022 min .73C above the early 1900s max 1.03C above the early 1900s Year to November 2022 min .69C above the early 1900s max .98C above the early 1900s Year to December 2022 min .63C above the early 1900s max .86C above the early 1900s Year to January 2023 min .56C above the early 1900s max .77C above the early 1900s Year to February 2023 min .54C above the early 1900s max .72C above the early 1900s Year to March 2023 min .49C above the early 1900s max .72C above the early 1900s Year to April 2023 min .35C above the early 1900s max .60C above the early 1900s Year to May 2023 min .23C above the early 1900s max .59C above the early 1900s Year to June 2023 min .08C above the early 1900s max .43C above the early 1900s Year to July 2023 min .10C above the early 1900s max .42C above the early 1900s Year to August 2023 min .15C above the early 1900s max .61C above the early 1900s Year to September 2023 min .26C above the early 1900s max .83C above the early 1900s Year to October 2023 min .39C above the early 1900s max 1.14C above the early 1900s Year to November 2023 min .60C above the early 1900s max 1.40C above the early 1900s Year to December 2023 min .67C above the early 1900s max 1.50C above the early 1900s Year to January 2024 min .73C above the early 1900s max 1.54C above the early 1900s Year to February 2024 min .79C above the early 1900s max 1.66C above the early 1900s Year to March 2024 min .77C above the early 1900s max 1.56C above the early 1900s Year to April 2024 min .86C above the early 1900s max 1.75C above the early 1900s Year to May 2024 min 1.05C above the early 1900s max 1.95C above the early 1900s Year to June 2024 min 1.24C above the early 1900s max 2.13C above the early 1900s Year to July 2024 min 1.33C above the early 1900s max 2.16C above the early 1900s Year to August 2024 min 1.47C above the early 1900s max 2.12C above the early 1900s Year to September 2024 min 1.44C above the early 1900s max 2.07C above the early 1900s Year to October 2024 min 1.49C above the early 1900s max 2.04C above the early 1900s Year to November 2024 min 1.41C above the early 1900s max 1.91C above the early 1900s The data shows averaged annual temperature across WA rose sharply from November 2009, the month the BOM software bug was corrected to adjust August 2009 average temperatures up by about half a degree. The above data is charted below:
BOM monthly data is available for all WA recording locations with historic averages which can be used to verify the trend calculates from 30 locations compared to 1900 baseline temperatures. The sharp upward trend compared with the 1900 average is reflected in BOM ACORN data below (BOM website source) which shows the overall WA mean temperature jumped by almost 1 degree C beginning in the spring of 2009 between August and November, broken into seasons to give some averaged time perspective.
Note: the ACORN-SAT dataset is being used by the BoM for temperature area averages from December 2012 onwards. For this reason, all averages tabulated above are from a different set of weather stations and in many cases their mean temperatures bear no relationship to the mean temperatures listed below.
The BOM explains its baseline for the above anomalies thus: The climatological averages shown in the text and tables are generally long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 30 years of record, as they cannot then be calculated reliably. Climatological extremes are generally taken from available observations from all available years of record. The number of years can vary substantially from site to site. The BOM also compares temperatures with the baseline average of 22.5C from 1961 to 1990. The BoM's portrayal of WA's temperature history is not static. The animation below shows the difference between the anomaly charts published in 2010 and 2013, the ACORN dataset of 2012 a probable reason for the early years cooling and temperatures warming since about 1930:
The bureau replaced the ACORN 1 temperature dataset of 2012 with a revised ACORN 2 dataset in late 2018, increasing Australia's per decade rate of warming by 23% (see analysis). In Western Australia, this cooled the 1961-90 anomaly baseline mean temperature at all 25 WA network stations from 20.44C in ACORN 1 to 20.15C in ACORN 2. The effect of this 0.29C difference (and further homogenised cooling of temperatures before 1961) can be seen in the animation below:
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