Twenty-one million visitors in a month is not bad and must suggest it is worth a visit. Relates solely to the landmass on the other side of the pond, but no doubt someone will (or maybe has) thought of doing this for other parts of the world. city-data.com
A few weather stats for 2011
Taking the period up to November 30th 2011, the average temperature has been 16.67 degrees which is slightly higher than the previous best, 2006.