They can’t tell us if it’s going to rain in 2-weeks, why should anyone think they have any real idea what’s going to happen with the weather long term?
Long term computer modelling was used to determine the global weather trends for the next 100 years. The BBC used distributed computing techniques and over 250,000 computers around the world were used (each computer had slightly different starting conditions and each computer took upto 3-6 months to calculate a single global weather projection, the averaged results then gave a reasonable certainty trend).
The results can be seen here at
http://www.bbc.co.uk/sn/climateexperiment/ 
Most of the USA is going to be on average 6-8 C warmer.
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