Fifty years ago, on 15th October 1962, British weather forecasts switched over from the Fahrenheit scale to Celsius. Fifty years on, some parts of the British media inexplicably cling on to Fahrenheit measures, and the UK Metric Association (UKMA) says it’s time to kill off Fahrenheit for good.

[Press release issued on 15 October 2012]



The UK Met Office has used the Celsius scale – formerly known as “centigrade” – in its work since 1st January 1961, to allow for greater international co-operation and because of the convenience of the scale. As the Met Office reported in 1962, this “led to the consideration of the desirability of introducing it in weather reports and forecasts for the general public.”

With the agreement of industry and the government, the Celsius scale was given after Fahrenheit from January 1962 as an interim measure, and then from the 15th October, Celsius became the primary unit given, with Fahrenheit retained as a secondary unit to aid the transition “for a period of several years.”

The Met Office is to be commended for accomplishing the change to the metric system of measurement so rapidly, in sharp contrast to some other parts of the government, such as the Department for Transport, which is still, fifty years later, dithering even about adding metres to safety-critical warning signs.

However, despite this early and rapid switch to Celsius-first forecasting, at the time of switchover, there was no timetable for the withdrawal of the Fahrenheit secondary measure. Says UKMA Chairman Robin Paice, “The officials at the Met Office in 1962 would almost certainly be incredulous at the prospect that, fifty years later, some media outlets would still be using Fahrenheit, and in some quarters, even as the primary scale. Two generations have now passed since Celsius was introduced, and yet we still see occasional headlines, normally in hot weather, about the temperature given in Fahrenheit.”

UKMA believes that with fifty years of Celsius weather forecasting now behind us, it is time for the British media to ditch Fahrenheit for good. “Media outlets should reflect on how they reported decimalisation; “new pence” are almost a decade younger than the Celsius temperature scale, and yet no newspapers feel the need to convert pence to shillings in their reports, and rightly so; why cling on to an even more obsolete temperature scale?”

The Met Office declined an invitation to comment.

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