BOM – Hiding The Heat Before 1910

Australia’s Bureau of Meteorology hides the January 1896 heatwave, because they say measurement techniques exaggerated afternoon temperatures by 1C.

In 1887, Todd set up what must be one of the longest-running scientific experiments ever, when he installed thermometers in a Stevenson Screen and on a Glaisher Stand at Adelaide Observatory (as seen in the illustration here). Observations were taken in both exposures until 1948.

The results of this 61-year experiment show that summer daytime temperatures measured using the Glaisher Stand are, on average, 1C warmer than in the Stevenson Screen.

You will find that, after the adjustments they make to the data (to ensure the early data can be reliably compared with modern data), some years in the 19th century were indeed warm. But nothing like the heat we endured across the country in 2013.

According to Berkeley Earth, the Australian average daily maximum temperature in January 1896 was about 1C hotter than the 1951-80 January average. But January 2013 was a full 1.5C hotter again – really, the late 19th century temperatures don’t come close to modern extremes.

That’s why the Bureau’s official temperature records start in 1910 – before that date we have good grounds for believing that the data are poor and biased (and would be difficult to adjust for the many problems).

FactCheck: was the 1896 heatwave wiped from the record?

I tested out their theory by comparing the 1896 heatwave vs. the 2013 heatwave. Even after subtracting 1C from the 1896 temperatures, 1896 was still 2C hotter than 2013. In 1896 they had weeks of extremely hot weather, whereas in 2013 they only had a small handful of hot days.

Nighttime temperatures were also 2C hotter in 1896 than 2013. Nighttime temperatures aren’t affected by stand type. Ignoring the 1896 heatwave is malfeasance, not science.

January 1896 was incredibly hot. BOM is hiding it because it wrecks their global warming scam.

TimesMachine: August 18, 1896 –

Summers in Australia used to be much hotter.  There is no indication of a step change at Bourke correlating to a change in stand type.  There is no justification for throwing out pre-1910 temperatures.

But the story gets worse. BOM is more than happy to use garbage UHI afflicted thermometers like this one in Melbourne, which probably report 3-5C too high.

Global warming is the biggest scam in science history, and government agencies use every excuse in the book to hide inconvenient data.

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17 Responses to BOM – Hiding The Heat Before 1910

  1. Brett says:

    But still produce headlines:
    Sydney weather: Summer confirmed as city’s hottest for days and nights in 157 years
    That would be 1860, not 1910.

    • MrGrimnasty says:

      More and more concrete/tarmac, more and more waste heat from aircon, it would be odd if the temperatures recorded in a city didn’t get hotter with time.

      That’s a problem with city design, not global climate change.

      If Sydney had existed as is today 157 years ago, the temperatures recorded back then would be completely different.

  2. Steve Case says:

    From above:

                 BOURKE POST OFFICE, AS Jan Average Maximum Temperature ….

    Yes indeed, paying attention to the maximum temperature yields more information about what’s really going on than the MIN/MAX averages. After all the average of 49 and 51 is 50 and the average of 1 and 99 is also 50. A lot of information is lost through the process of averaging.

  3. gator69 says:

    Too bad Todd Charles isn’t around to correct the poorly sited UHI stations used today. Amazing that alarmists recognize a difference in thermometer platforms, and yet are utterly clueless when it comes to UHI.

  4. Don B says:

    “It was very hot in Australia in the late 1800s and the early years of the 1900s, particularly in outback Australia – at places like Bourke. Many of the extremely hot days were recorded using non-standard equipment, and so they are not recognised by Australia’s Bureau of Meteorology. Outrageously though, the Bureau has deleted from the raw digitised record the hottest day ever recorded in standard equipment at an official weather station. Ostensibly, because it was recorded on a Sunday – the day that the temperature-recorders normally had off in the days of manual temperature recordings.

    “No doubt the fellow who recorded temperatures from the thermometer in the Stevenson screen at the Bourke post office got up on the morning of Sunday 3rd January 1909, and decided he was going to work anyway. He was not going to miss what did turn out to be the hottest day of the century.

    “So, when I went to the trouble of getting access to the log book, now held by the National Archives of Australia, I could see that the fellow had not only written in 125 degree Fahrenheit (equivalent to 51.6 degree Celsius) – he had also underlined it!”

  5. toorightmate says:

    I hope you good people are aware that these fandangled thermometer things are nowhere near as accurate as tree rings and ice cores.

    • Colorado Wellington says:

      Measuring the strokes of swimming polar bears*) also gives better temperature readings than those 19th century thermometers thingies. I wish these backwards Australians knew it back in the day. The brought rabbits, foxes, goats, pigs, cats and dogs.

      Why no scientifically useful polar bears?

      *) And reading chicken entrails. You never ignore chicken entrails.

  6. Steve Case says:

    …I went to the trouble of getting access to the log book, now held by the National Archives of Australia…

    Eventually an objective review of the original documents will have to be done. If they’ve been tossed, the people responsible need to be brought up on charges.

  7. Rosco says:

    The simple fact that BOM removed access to the historical record for the World record Marble Bar heatwave shows that there is nothing too Orwellian for this corrupted organisation.

    The world record heatwave is part of history owned by all yet they choose to hide it.

    Who needs such organisations ?

    They prove they are liars by deceit.

    This is what you get if you Google Marble Bar heatwave 1923-24
    “A description for this result is not available because of this site’s robots.txt”

    “The page you requested was not found on this server”

    Liars ! It was there a few years ago.

  8. Mark M says:

    Temperature data prior to 1910 should be used with extreme caution as many stations, prior to that date, were exposed in non-standard shelters, some of which give readings which are several degrees warmer or cooler than those measured according to post-1910 standards.

    Extreme caution is thrown under the bus when ever it suits.
    “Several degrees warmer or cooler”?
    Which way (one way) the adjustments went is a matter for the records and courts.

  9. Mark M says:

    BoM withdraws advice Alice Springs recorded its hottest day ever, blames faulty thermometer

    Cooler weather delays Eliminate Dengue trial in Stratford, Freshwater

    “Mosquitoes obviously appreciate the warmer weather but it’s actually easier for us to establish bacteria when there’s less mosquitoes around but as it turned out this year was a little cooler than expected and it took a little longer to get the target number of mosquitoes in these areas.”

    Melbourne changes monitoring site from city to park, new max temperature averages 1.2C cooler

    Mr Trewin also noted that the Bureau had recently changed its Melbourne monitoring site from the Royal Society of Victoria on La Trobe Street in the city to Olympic Park, near Rod Laver Arena. Maximum temperatures recorded at the new site were on average 1.2 degrees cooler, particularly on cool days, because air coming from the south and west was travelling over parklands rather than the through the city.

    Australia’s early settlers weathered drought and flooding rains

    “The information, recorded before the start of official record-keeping in 1910, reveals that although the colony had a wet start in its first two years, the summers of 1790 and 1791 were hot and dry.
    Flying foxes and small birds reportedly fell from the trees and crops failed.
    Documenting the temperature, rainfall and atmospheric pressure experienced by the young colony was a job taken seriously by scientists and farmers.
    Extreme weather was also noted in great detail in newspapers.

  10. Mark M says:

    “The bureau wants to relocate to the Parklands site to be able to make comparisons with historical readings gathered at a previous station which operated near the site between the early days of the South Australian colony and 1979, when the city station was moved to Kent Town.

    The data from the new weather station would be able to be accurately compared to historical figures to determine the impact of climate change.”

    from comments: Roger Apr 8, 2015
    “At long last the BOM admits with this action, that it has no idea whatsoever what’s happened to Adelaide’s temperature after it scrapped one of the world’s longest serving Stevenson Screens in the parklands for measurement among the tar and cement at Kent Town 40 odd years ago. And now they want to cut down a few trees to get a more accurate temp reading back at the old spot again? Priceless!

    The tears of mirth and vindication must be rolling down Anthony Watts cheeks at this news. “

  11. Simon M says:

    I haven’t had chance to download the BoM data and investigate for myself.

    However, a quick look at the NASA climate record shows there is no conspiracy. The 1890s were warmer on average than 1900-1920, but that pales in comparison to modern temperatures. See for yourself:

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