Scorecard for ACORN-SAT Quality Assurance – the score so far.

Three more quality tests of stations in the ACORN-SAT series have been completed:

The test measures the deviation of the trend of the series from its neighbours since 1913 (or residual trend). A deviation of plus or minus 0.05 degrees per decade is within tolerance (green), 0.05 to 0.1 is borderline (amber), and greater than than is regarded a fail (red) and should not be used.

Maximum Minimum
Rutherglen -0.02 -0.03 -0.05 0.14
Williamtown 0.08 -0.02 -0.13 -0.00
Deniliquin -0.05 0.03 -0.02 0.13
Amberley -0.01 -0.01 -0.32 0.09
Cape Otway Lighthouse -0.17 0.02 -0.05 0.01
Wilcannia -0.16 -0.06 -0.13 0.05
Kerang 0.02 0.05 -0.01 0.13

There are more inconsistent stations among the raw CDO data — as would be expected as it is “raw”. Howover the standout problems in this small sample are in the ACORN-SAT minimums.

Results so far suggest the Bureau of Meteorology has a quality control problem with its minimum temperatures, with almost all borderline residual trends and very large deviations from the neighbours in Rutherglen and Deniliquin.


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