Excerpt from Wikipedia article below:
In Jamaica and the United States, where metrication has encountered resistance from industry and consumers, the Fahrenheit system continues to be very widely used. In the United Kingdom Celsius has been widely adopted, although Fahrenheit is still rarely used by older generations (50 years old and over) for measurement of higher temperatures, lower temperatures are measured in degrees Celsius. The majority of the population in the UK and in most other countries have adopted Celsius as the primary scale in use.
Interestingly it was proposed by a German Scientist, Gabriel Fahrenheit, but the Germans have abandoned it.
Here is a Wikipedia link:http://en.wikipedia.org/wiki/Fahrenheit
The Fahrenheit scale was the primary temperature standard for climatic, industrial and medical purposes in most English-speaking countries until the 1960s. In the late 1960s and 1970s the Celsius (formerly centigrade) scale was phased-in by governments as part of the standardizing process of metrication.
Fahrenheit supporters claim its previous popularity was due to Fahrenheit's user-friendliness. The unit of measure, being only 5/9 the size of the Celsius degree, permits more precise communication of measurements without resorting to fractional degrees. Also, the ambient air temperature in most inhabited regions of the world tends not to go far beyond the range of 0 °F to 100 °F: therefore, the Fahrenheit scale would reflect the perceived ambient temperatures, following 10-degree bands that emerge in the Fahrenheit system: