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Since the installation of an automatic weather station at Thredbo, there has been a reduction in the number of days each year when the temperature has fallen to, or below minus 10.0 degree Celsius - from an average of 2.5 (1966 to 1996) to 1.1 days (1997 to July 2017).   As a matter or urgency, the Bureau needs to explain when the limits were placed on the minimum temperature that could be recorded at this, and other,  automatic weather stations.

Four-Steps Needed to Restore Confidence in Bureau’s Handling of Temperature Data

THE Minister for Environment and Energy, Josh Frydenberg, needs to immediately instigate the following four-step process to restore confidence in the recording and handling of historical temperature data. Step 1 – Instruct the Bureau to immediately: 1. Lift any limits currently placed on the recording of minimum temperatures; 2. Make publicly available the dates on […]

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Jennifer Marohasy visiting the Goulburn weather station on 31st July

Bureau of Inconsistencies: Need for Urgent Independent Inquiry

MINISTER Josh Frydenberg was told by the Australian Bureau of Meteorology on, or about, Wednesday 5th July 2017 that limits had been placed on how cold temperatures could be recorded across mainland Australia. This winter we have experienced record low temperatures.   But only the keenest weather observers have noticed, because the Bureau has been changing […]

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Bureau Misleads Minister Frydenberg on Goulburn

RATHER than admit that temperature dropped to a record low -10.4 degree Celsius on the morning of Sunday 2nd July at Goulburn, the Bureau of Meteorology has come-up with yet another even more absurd story. Responding to a letter from Josh Frydenberg, the Minister for  Environment and Energy, Andrew Johnson, CEO and Director of Meteorology, […]

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Jennifer walking in the rain along Weyba Creek,  Noosaville, August 2014.

Skilful Monthly Rainfall Forecasts

THE accurate weather forecast of James Stagg back in June 1944 is considered crucial to the successful D-day invasion that changed the course of WWII. Should we find ourselves at war again, is there an institution or individual capable of providing an accurate short or long-term weather forecast? Dr John Abbot and I are working towards […]

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The screenshot taken soon after 5.30am on the morning of Sunday 16th July 2017.  This clearly shows the Automatic Weather Station at Thredbo recorded at temperature of -10.4 degree Celsius.

Bureau Still Limiting Cooling to Minus 10 Degrees

TWO weeks ago, in response to my queries the Australian Bureau of Meteorology acknowledged that it had put in place limits on the lowest temperature that an individual weather station could record.  So, when the automatic weather station which now operates in the town of Goulburn (not far from Canberra), recorded a measurement of minus […]

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A simple histogram of daily minimum temperatures as recorded at Goulburn airport (station number 70330) from July 1990 to yesterday.

Bureau Now Sets Strict Limits on Cooling

OVER recent years I have documented the blatant remodelling of temperature measurements through the process of homogenisation. I have explained that it is the homogenised datasets that are used to report climate change by the Australian Bureau of Meteorology and the CSIRO.   I had assumed, however, that the raw data, kept in the CDO dataset, […]

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Photograph from log book of temperature recording as made at Bourke post office in January 1909.   Photograph taken by Jennifer Marohasy at National Archives of Australia, Chester Hill Reading Room, on 26 June 2014.

Australia’s Hottest Day on Record Ever – Deleted

The last few days have been very hot across eastern Australia. The mainstream media have been reporting ‘unprecedented’ conditions. This fits a popular narrative, but its inconsistent with the original historical record. It was very hot in Australia in the late 1800s and the early years of the 1900s, particularly in outback Australia – at […]

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This chart compares the homogenised-temperature trend with a trend based on simple statistical averaging - both series are purported to represent climate variability and change for the Northern Colorado Front Range, 1900 to 2015.

Homogenisation Used to Embed Artificial Warming Trend in Colorado Temperature Record

After looking at hundreds of temperature series from different locations across Australia, I’ve come to understand that only cities show the type of warming reported by the IPCC, and other such government-funded institutions. Much of this warming is due to what is known as the Urban Heat Island (UHI) effect: bitumen, tall-buildings, air-conditioners, and fewer […]

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