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Meteorologists use a standard enclosure called a Stevenson screen[1] to ensure measurement consistency around the world. Or at least they did until very recent

Meteorologists use a standard enclosure called a Stevenson screen[1] to ensure measurement consistency around the world. Or at least they did until very recently. There might now be some active-airflow alternatives. Anyway, if it isn't measured with a (calibrated) standard apparatus, it isn't an official measurement. [1] https://en.wikipedia.org/wiki/Stevenson_screen https://en.wikipedia.org/wiki/Stevenson_screen

yummypaint 6y ago
To expand on this, the thermometer itself will come with documentation tracing its calibration back to NIST. This applies to scientific instruments of all kinds. Not doing that is part of why grocery store thermometers are so cheap. https://www.nist.gov/traceability/supplementary-materials-related-nist-policy-metrological-traceability https://www.nist.gov/traceability/supplementary-materials-re...