The rise of 2 C is the difference between a global annual mean of local daily median temperatures over a 30-year period and an adjusted global annual mean of lo

The rise of 2 C is the difference between a global annual mean of local daily median temperatures over a 30-year period and an adjusted global annual mean of local daily median temperatures over a 30-year period at the end of last century. It says nothing about variance and does not include precision or accuracy. It could very well be that everywhere will be 20 or 30 C above the 20th century climatology and the average will still be only 2 C if you truly believe and have faith in the message.