Western Australia temperature archive since 2009
Download this CSV file for archives of rolling 12 month average temperatures recorded at Western Australia's 28 oldest weather station locations since 2009. The Bureau of Meteorology also provides up-to-date monthly average anomalies at 25 WA ACORN weather stations since January 1910 when compared to 1961-90. 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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