About two years ago I created a web page about temperatures in Blacksburg, Roanoke and Richmond: http://www.roperld.com/science/subtropicalva.htm
The conclusions were:
· Roanoke, Virginia in the Roanoke Valley is well on the way to being a subtropical region.
· Blacksburg, Virginia is NOT on the verge of being a subtropical region.
· Richmond, Virginia has been a subtropical region since about 1990.
Today I added the data for 2010 & 2011 and got the following interesting graphs: