I've just been looking at a climate change thread (comments on George Monbiot's Guardian column), some one has posted some average temperatures giving figures to two decimal places. Now I doubt that the met office measure temperature to two decimal places so this is probably the result of averaging. To the meat of it, I always understood that you can not average to a greater resolution then the raw data, i.e. if you measure temperature to one decimal place you cannot then quote averaged temperatures to more then one decimal place. Have I misunderstood this for years or is there some dodgy data floating around?