USA NOAA June 2016 Tmin versus Tmax – UHI? Published on July 9, 2016July 9, 2016 by sunshinehours11 Comment NOAA just put out the USA temperature for June 2016. Lets compare Tmin (minimum) versus Tmax (maximum) Wow. Tmin has been skyrocketing since 1980. Tmax has just gone up and down. I suggest UHI (Urban Heat Islands) not “Global Warming”.