Yes, it's conservative but definitely better. If you use all the Nashville data of 135+ years, it averages out to 7b. I was too lazy to average out the other cities. I speculate that downtown Nashville (between the river and Music Row) could average out to as high as 8a in spots over the same amount of time. Tennessee has so many microclimates because of our topography and location in the Mid-South.

I think you're right, Tommy, about the downtown areas. Knoxville is the same way; in the last couple of decades, downtown Knoxville has averaged to somewhere near 8a. I also had noticed that the map (even when I downloaded the high resolution version) didn't show that fairly large microclimate.

Yes, it definitely does not take into account the heat island micro-climates of any large Tennessee city besides Memphis. The Memphis heat island seems to be larger because of the mighty Mississippi as there is a general surge in warmer temperatures and zones extending all the way up from the Delta.

Finally!!! I am glad that we now have physical proof for what I have been trying to tell you all for multiple years. I agree with Brandon's observation that urban heat islands are still mainly unrepresented for mid-size cities. Apparently, recent updates have started to represent these heat islands for very large urban areas such as San Francisco, Los Angeles, New York, Detroit, etc. Btw, if you look at the past 10-15 years, Knoxville is around 8a!

can you please include Canada?