Andrew Bolt reports on NOAA’s exaggerated claim that July 2015 was the hottest month on Earth since records began

Great to see a blog such as Andrew Bolt tackling climate misinformation. – Sydney Liberal MP Craig Kelly is curious. Well for a start NOAA is talking mean temperature – an average of max and min. Some of the quotes at Andrew Bolt refer to the daily max. But still there are many cases where the mean temperature Australian data contradicts the NOAA percentile map – Australian sector shown here.

NOAA does have an anomaly map that looks less exaggerated but still wrong in places.
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Andrew Bolt asks – Why is the NOAA map for Australia running so very warm? The answer is probably that the GHCN version quoted by NOAA has been adjusted so the past is too cool hence shows too much warming – similar to the BoM ACORN data. It is also likely the SST’s data is similarly fiddled warmer. But how NOAA can publish such way out rubbish is beyond me.
Just taking two examples from grid squares on the NOAA anomaly map – Alice Springs Airport mean temperature and East Sale Airport – both contradict the NOAA anomaly map and of course the even crazier percentile map. Choose your region – then click on July in menu bar – Brisbane also looks a dud for NOAA. Andrew Bolt now shows the BoM July 2015 mean t anomaly to assist readers to check on NOAA.

4 thoughts on “Andrew Bolt reports on NOAA’s exaggerated claim that July 2015 was the hottest month on Earth since records began”

  1. Thanks for finding that map Mr Me – which does look more realistic – but now NOAA have “lost” Alice Springs – showing the grey for “missing data” instead of showing that grid cell sl cool with pale blue. I see they missed the grid cell east of Birdsville where Thargomindah was way cool in July.
    www.australianweathernews.com/data/DS0745.HTM

    I wonder if the century and more long time series behind this land only NOAA map show July 2015 was hottest ever?

  2. The BoM use a 1961-1990 average for its anomaly base. Does NOAA use the same base?
    Slightly OT, but on the topic of these shading representations of temp, I find a disparity between actual site temps and the recorded overall max mean temp.
    For instance in NSW for Aug the summary claims a +0.24C max mean anomaly for the state.
    Does the BoM use its weighted/shaded homogenised map as a basis for its anomaly determinations, ACORN averages or all site averages? It claims it uses ACORN stations.
    However, if one averages all 25 ACORN stations for NSW, the mean is -0.27C.
    If one averages all 147 stations, the mean comes to -0.3C.

    So I checked the map and found most of northern NSW above average. Districts 46, 47 and 48 average out at -0.77C and therefore should be shown as below average. Only 4 stations out of about 30 in this area were above average.
    North and mid-North areas (District 58 &59) are shown as 1-2C above average but the stations average out just below 1C (ah well, close enough).
    How the BoM can get an above average mean max temp from the actual site temps is beyond me.
    Readers would also like to know we had the 8th hottest winter on record this year. We must be gearing up for Paris.
    Source for NSW max mean anomalies (map)
    www.bom.gov.au/web03/ncc/www/awap/temperature/maxanom/month/colour/history/ns/2015080120150831.gif
    All sites for NSW
    www.bom.gov.au/climate/current/month/nsw/summary.shtml

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