"Dave Cornwell" wrote in message
...
I defy anybody to claim they know what is going to happen in a weeks time.
The divergence of the output is such that there is almost 17 degC
difference between highest and lowest GFS ensemble members (850 hPa) for
the whole period after the 20th. I'm reasonably confident that the maximum
temperature on Christmas Day will be between -2C and 10C.
Dave

C'mon Dave no one can be that accurate give us a more general view.