“I think the conclusion that urban heat islands contribute essentially zero to the warming we see is on very solid ground.”
The National Weather Service has documented 7-13F UHI in Phoenix
By the end of the series, there was a +4 to 7 ºC (7 to 13 ºF) difference between the urban minimum temperatures and the rural minimum temperatures.
Barrow has 2.2C UHI
During winter (December 2001–March 2002),
the urban area averaged 2.2 °C warmer than the hinterland.
GISS says that New York has 6C UHI
But Muller says there is no UHI