Heartland has just published a report entitled Corrupted Climate Stations: The Official U.S. Surface Temperature Record Remains Fatally Flawed
This report states that all US climate stations have been the subject of an investigation and this has shown that approximate 965 of the US weather stations used to measure temperatures to demonstrate climate change , do not meet NOAA ( National Oceanic and Atmospheric Administration ) standards and what could be considered acceptable.
The survey of all NOAA weather stations ( which take climate measurements ) was conducted both via satellites and personal rappelling at each location.
" The research shows that 96% of these stations are corrupted by localised effects of urbanisation - producing heat-bias because of their close proximity to asphalt, machinery, and other heat-producing, heat-trapping, or heat-accentuating objects.
Placing temperature stations in such locations violates NOAA's own published standards & strongly (https://www.nws.noaa.gov/directives/sym/pd01013002curr.pdf) undermines the legitimacy & the magnitude of the official consensus on long-term climate warming trends in the USA. "
Summary : recording high temperatures is not difficult if you place a heating element right next to or in the immediate vicinity of the measuring device.....