The Met Office operates hundreds of weather stations at locations the length and breadth of the United Kingdom. One such weather station is sited at Kew Gardens which frequently records the hottest temperatures in the UK.
A few days ago, the Met Office admitted that Kew Gardens is a CIMO Class 5 site.
“Class 5 sites should not be used for climatological purposes, I look forward to the Met Office removing the spurious ‘record temperature’ from their website,” Paul Homewood writes.
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The World Meteorological Organisation’s (“WMO’s”) Commission for Instruments and Methods of Observation (“CIMO”) establishes global standards for weather station siting and classification. Its classification system is a global framework that indicates how closely a weather station’s siting aligns with ideal exposure conditions.
The WMO is a specialised agency of the United Nations.
The Siting Classification for Surface Observing Stations on Land was formally introduced by WMO in 2014 and uses a Class 1 to Class 5 scale to assess the quality and representativeness of a site’s exposure for meteorological measurements like temperature, humidity and precipitation.
Class 1 represents an ideal, reference-grade site with wide-open exposure and minimal local influence, while Class 5 indicates an inappropriate environment with significant local obstructions or heat sources. It allows for broad international comparisons of data quality, with higher classes (1–2) indicating high confidence in data representativeness and lower classes (4–5) suggesting notable local exposure characteristics.
The Met Office internally rates stations as “Excellent,” “Good,” “Satisfactory,” or “Unsatisfactory,” and excludes Class 5 data from national climate records, while quoting Class 1–4 data.
Met Office Admit Kew Is A Class 5 Junk Site
By Paul Homewood, as published by Not A Lot Of People Know That on 3 September 2026
Huge news from Dr Eric Huxter’s website:
As Ray Sanders had picked up from a January 2026 Freedom of Information (“FoI”) request for a list of CIMO 1 and 2 class weather stations.
Kew Gardens, up to now Class 2, did not appear on this list. On 24 May I sent an enquiry as to its current status to the Meteorological Office Enquiries desk. My enquiry was given a case number and I awaited the response. In July there had been no answer therefore I sent the question again, with the associated number. On the 29th August I received the following answer:
“We apologies [sic] in the delay getting back to you, our support team has come back and said the CIMO rating is or can be different for each sensor depending on the exposure assessment.”
I was suitably impressed at the length of time to produce this deflection and sent a more precise question as to the CIMO Site Class for the air temperature sensor and today received this response:
“The air temperature sensor at Kew Gardens is classified as CIMO 5.”
Full story HERE.
As readers will be aware, Ray, Eric and I have been paying close attention to Kew Gardens, since it set the May temperature record earlier this year.
Despite being classified as Class 2, recent photographs revealed overgrown vegetation and close proximity of the screen to a fence. By WMO standards, Kew should at best be a Class 4.
On top of that are the inappropriate surroundings in the Gardens.
Kew has often topped the daily lists for hottest places, including that May record:
As WMO rules make clear that Class 5 sites should not be used for climatological purposes, I look forward to the Met Office removing the spurious “record temperature” from their website.
About the Author
Paul Homewood is a British climate change blogger known for his website ‘Not a Lot of People Know That’, which, according to climate catastrophe activist blog DeSmog, has attracted over 12 million visitors since 2011. He is a retired accountant and telecommunications engineer who served as a briefing author for the Global Warming Policy Foundation (“GWPF”).
Featured image taken from ‘New June daily temperature records heading into the record books’, Met Office, 29 July 2026
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