## Western Australia temperature archive since 2009Below archives rolling 12 month average temperatures recorded at Western Australia's 30 oldest weather station locations since 2009.
min .27C above the early 1900s max .68C above the early 1900s
min .30C above the early 1900s max .79C above the early 1900s
min .24C above the early 1900s max .76C above the early 1900s
min .28C above the early 1900s max .71C above the early 1900s
min .33C above the early 1900s max .70C above the early 1900s
min .54C above the early 1900s max .77C above the early 1900s
min .47C above the early 1900s max .65C above the early 1900s
min .43C above the early 1900s max .65C above the early 1900s
min .53C above the early 1900s max .92C above the early 1900s
min .58C above the early 1900s max 1.09C above the early 1900s
min .55C above the early 1900s max 1.16C above the early 1900s
min .60C above the early 1900s max 1.27C above the early 1900s
min .76C above the early 1900s max 1.36C above the early 1900s
min .80C above the early 1900s max 1.34C above the early 1900s
min .86C above the early 1900s max 1.28C above the early 1900s
min .80C above the early 1900s max 1.29C above the early 1900s
min .74C above the early 1900s max 1.30C above the early 1900s
min .63C above the early 1900s max 1.25C above the early 1900s
min .63C above the early 1900s max 1.32C above the early 1900s
min .56C above the early 1900s max 1.32C above the early 1900s
min .57C above the early 1900s max 1.35C above the early 1900s
min .60C above the early 1900s max 1.22C above the early 1900s
min .67C above the early 1900s max 1.15C above the early 1900s
min .71C above the early 1900s max 1.01C above the early 1900s
min .69C above the early 1900s max .93C above the early 1900s
min .67C above the early 1900s max .94C above the early 1900s
min .69C above the early 1900s max .92C above the early 1900s
min .74C above the early 1900s max .93C above the early 1900s
min .87C above the early 1900s max .95C above the early 1900s
min .96C above the early 1900s max 1.03C above the early 1900s
min .94C above the early 1900s max 1.04C above the early 1900s
min 1.06C above the early 1900s max .97C above the early 1900s
min 1.03C above the early 1900s max .82C above the early 1900s
min 1.08C above the early 1900s max 0.86C above the early 1900s
min 1.06C above the early 1900s max .80C above the early 1900s
min .97C above the early 1900s max .85C above the early 1900s
min .86C above the early 1900s max .85C above the early 1900s
min .83C above the early 1900s max 0.86C above the early 1900s
min .75C above the early 1900s max .94C above the early 1900s
min .76C above the early 1900s max .94C above the early 1900s
min .54C above the early 1900s max .95C above the early 1900s
min .46C above the early 1900s max 0.97C above the early 1900s
min .53C above the early 1900s max 1.06C above the early 1900s
min .52C above the early 1900s max 1.21C above the early 1900s
min .50C above the early 1900s max 1.23C above the early 1900s
min .51C above the early 1900s max 1.33C above the early 1900s
min .52C above the early 1900s max 1.41C above the early 1900s
min .55C above the early 1900s max 1.53C above the early 1900s
min .60C above the early 1900s max 1.44C above the early 1900s
min .77C above the early 1900s max 1.55C above the early 1900s
min .90C above the early 1900s max 1.48C above the early 1900s
min .87C above the early 1900s max 1.48C above the early 1900s
min 0.99C above the early 1900s max 1.50C above the early 1900s
min 1.13C above the early 1900s max 1.52C above the early 1900s
min 1.23C above the early 1900s max 1.45C above the early 1900s
min 1.19C above the early 1900s max 1.40C above the early 1900s
min 1.30C above the early 1900s max 1.51C above the early 1900s
min 1.21C above the early 1900s max 1.47C above the early 1900s
min 1.16C above the early 1900s max 1.43C above the early 1900s
min 1.11C above the early 1900s max 1.31C above the early 1900s
min 1.16C above the early 1900s max 1.45C above the early 1900s
min 1.01C above the early 1900s max 1.33C above the early 1900s
min 1.08C above the early 1900s max 1.35C above the early 1900s
min 1.03C above the early 1900s max 1.37C above the early 1900s
min 1.07C above the early 1900s max 1.36C above the early 1900s
min 1.03C above the early 1900s max 1.41C above the early 1900s
min 1.02C above the early 1900s max 1.54C above the early 1900s
min 1.09C above the early 1900s max 1.58C above the early 1900s
min 1.00C above the early 1900s max 1.53C above the early 1900s
min .97C above the early 1900s max 1.47C above the early 1900s
min .96C above the early 1900s max 1.49C above the early 1900s
min 1.07C above the early 1900s max 1.66C above the early 1900s
min 1.05C above the early 1900s max 1.56C above the early 1900s
min 1.02C above the early 1900s max 1.42C above the early 1900s
min .79C above the early 1900s max 1.34C above the early 1900s
min .89C above the early 1900s max 1.45C above the early 1900s
min .92C above the early 1900s max 1.47C above the early 1900s
min .90C above the early 1900s max 1.33C above the early 1900s
min .76C above the early 1900s max 1.30C above the early 1900s
min .81C above the early 1900s max 1.42C above the early 1900s
min .91C above the early 1900s max 1.52C above the early 1900s
min .93C above the early 1900s max 1.55C above the early 1900s
min 1.01C above the early 1900s max 1.49C above the early 1900s
min .89C above the early 1900s max 1.39C above the early 1900s
min 0.98C above the early 1900s max 1.42C above the early 1900s
min 1.09C above the early 1900s max 1.51C above the early 1900s
min 1.19C above the early 1900s max 1.56C above the early 1900s
min 1.17C above the early 1900s max 1.39C above the early 1900s
min 1.13C above the early 1900s max 1.30C above the early 1900s
min 1.05C above the early 1900s max 1.21C above the early 1900s
min .99C above the early 1900s max .98C above the early 1900s
min .76C above the early 1900s max .69C above the early 1900s
min .62C above the early 1900s max .65C above the early 1900s
min .59C above the early 1900s max .59C above the early 1900s
min .44C above the early 1900s max .56C above the early 1900s
min .40C above the early 1900s max .38C above the early 1900s
min .28C above the early 1900s max .32C above the early 1900s
min .13C above the early 1900s max .34C above the early 1900s
min .09C above the early 1900s max .42C above the early 1900s
min .00C above the early 1900s max .60C above the early 1900s
min .01C above the early 1900s max .70C above the early 1900s
min .08C above the early 1900s max .80C above the early 1900s
min .21C above the early 1900s max .96C above the early 1900s
min .30C above the early 1900s max 1.04C above the early 1900s
min .41C above the early 1900s max 1.02C above the early 1900s
min .45C above the early 1900s max 1.08C above the early 1900s
min .51C above the early 1900s max 1.07C above the early 1900s
min .55C above the early 1900s max 1.08C above the early 1900s
min .63C above the early 1900s max 1.21C above the early 1900s
min .70C above the early 1900s max 1.29C above the early 1900s
min .68C above the early 1900s max 1.34C above the early 1900s
min .72C above the early 1900s max 1.22C above the early 1900s
min .75C above the early 1900s max 1.27C above the early 1900s
min .65C above the early 1900s max 1.18C above the early 1900s
min .58C above the early 1900s max 1.17C above the early 1900s
min .65C above the early 1900s max 1.15C above the early 1900s
min .52C above the early 1900s max 1.01C above the early 1900s
min .52C above the early 1900s max 1.03C above the early 1900s
min .49C above the early 1900s max 1.11C above the early 1900s
min .50C above the early 1900s max 1.31C above the early 1900s
min .51C above the early 1900s max 1.30C above the early 1900s
min .46C above the early 1900s max 1.23C above the early 1900s
min .38C above the early 1900s max 1.17C above the early 1900s
min .38C above the early 1900s max 1.18C above the early 1900s
min .34C above the early 1900s max 1.17C above the early 1900s
min .37C above the early 1900s max 1.30C above the early 1900s
min .45C above the early 1900s max 1.42C above the early 1900s
min .43C above the early 1900s max 1.54C above the early 1900s
min .50C above the early 1900s max 1.78C above the early 1900s
min .66C above the early 1900s max 2.05C above the early 1900s
min .70C above the early 1900s max 2.01C above the early 1900s
min .80C above the early 1900s max 1.94C above the early 1900s
min .80C above the early 1900s max 1.91C above the early 1900s
min .94C above the early 1900s max 1.97C above the early 1900s
min 1.02C above the early 1900s max 1.91C above the early 1900s
min 1.11C above the early 1900s max 2.04C above the early 1900s
min 1.13C above the early 1900s max 2.08C above the early 1900s
min 1.20C above the early 1900s max 2.06C above the early 1900s
min 1.27C above the early 1900s max 2.01C above the early 1900s
min 1.25C above the early 1900s max 1.96C above the early 1900s
min 1.26C above the early 1900s max 1.78C above the early 1900s
min 1.10C above the early 1900s max 1.48C above the early 1900s
min 1.14C above the early 1900s max 1.52C above the early 1900s
min .99C above the early 1900s max 1.39C above the early 1900s
min .98C above the early 1900s max 1.35C above the early 1900s
min .90C above the early 1900s max 1.35C above the early 1900s
min 1.04C above the early 1900s max 1.39C above the early 1900s
min .95C above the early 1900s max 1.17C above the early 1900s
min 1.05C above the early 1900s max 1.08C above the early 1900s
min 1.03C above the early 1900s max 1.11C above the early 1900s
min .92C above the early 1900s max 1.05C above the early 1900s
min .79C above the early 1900s max .88C above the early 1900s
min .71C above the early 1900s max .83C above the early 1900s
min .73C above the early 1900s max .92C above the early 1900s
min .73C above the early 1900s max .96C above the early 1900s
min .82C above the early 1900s max 1.18C above the early 1900s
min .84C above the early 1900s max 1.23C above the early 1900s
min .83C above the early 1900s max 1.12C above the early 1900s
min .78C above the early 1900s max 1.12C above the early 1900s
min .87C above the early 1900s max 1.21C above the early 1900s
min .70C above the early 1900s max 1.22C above the early 1900s
min .66C above the early 1900s max 1.14C above the early 1900s
min .73C above the early 1900s max 1.06C above the early 1900s
min .73C above the early 1900s max 1.03C above the early 1900s
min .69C above the early 1900s max .98C above the early 1900s
min .63C above the early 1900s max .86C above the early 1900s
min .56C above the early 1900s max .77C above the early 1900s
min .54C above the early 1900s max .72C above the early 1900s
min .49C above the early 1900s max .72C above the early 1900s
min .35C above the early 1900s max .60C above the early 1900s
min .23C above the early 1900s max .59C above the early 1900s
min .08C above the early 1900s max .43C above the early 1900s
min .10C above the early 1900s max .42C above the early 1900s
min .15C above the early 1900s max .61C above the early 1900s
min .26C above the early 1900s max .83C above the early 1900s
min .39C above the early 1900s max 1.14C above the early 1900s
min .60C above the early 1900s max 1.40C above the early 1900s
min .67C above the early 1900s max 1.50C above the early 1900s
min .73C above the early 1900s max 1.54C above the early 1900s
min .79C above the early 1900s max 1.66C above the early 1900s
min .77C above the early 1900s max 1.56C above the early 1900s
min .86C above the early 1900s max 1.75C above the early 1900s
min 1.05C above the early 1900s max 1.95C above the early 1900s
min 1.24C above the early 1900s max 2.13C above the early 1900s
min 1.33C above the early 1900s max 2.16C above the early 1900s
min 1.47C above the early 1900s max 2.12C 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.
The BOM explains its baseline for the above anomalies thus: 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: Top of page This website produced by Scribeworks 2008-2023 |