By Paul Homewood
h/t Ian Magness
Temperature tampering in the Netherlands now!
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The Royal Netherlands Meteorological Institute (KNMI) routinely applies corrections to historical temperature data, allegedly to improve accuracy. One of the most intriguing weather stations I’ve analyzed is De Bilt in the Netherlands. With records dating back to 1706, it provides a rare glimpse into pre-industrial climate trends—essential for understanding long-term climate behavior.
The thermometers at this station are highly precise, measuring temperatures within ±0.1°C. Historical data archived in 2013 reveals key observations: The warmest recorded months were July 1852, July 1868, and July 2006. From 1706 to 2013, the average annual temperature trend shows a warming rate of 0.33°C per century, with an R² confidence level of 26%. Notably, a cooling period occurred from 1870 to 1960.
However, KNMI’s continuous "corrections" raise serious concerns: 2016 – KNMI homogenized the data, subtracting 0.33°C from all records before 1954, claiming the older pagoda-style thermometer screen provided less sun shielding than the modern Stevenson screen. This adjustment seems counterintuitive. 2020 – Data prior to 1900 was removed. KNMI stated they were "working on correcting the data." 2023 – The data was re-released, but all records from 1845 to 1904 were "corrected" by subtracting 1°C. 2024 – Another adjustment was made, this time adding 0.5°C to all records before 1728. It also appears they forgot to correct data from 1736 to 1844.
Does anyone verify these changes? I reached out multiple times, requesting details and access to the original daily records, including scanned PDFs of historical logs. My requests were ignored. At this point, it’s difficult not to question the motivations behind these repeated adjustments. Is this about science—or about controlling the narrative? Here are my slides https://lnkd.in/gcdEmdim
