As mentioned over in the model thread, going by the latest ECM, GFS and UKMO runs, particularly the latter two, there is still a fair chance of seeing a slightly sub-0 CET month, considering the agreement of the three models for a northerly is currently quite good. However, I'd say at this stage it's more likely that the CET will be above 0c. As you say, it's most likely to end up between 1.5c and 2.0c, which makes my original punt (as thread hoster) of 4.5c unlikely.
Also, February will probably be statistically the coldest month of 2012, unless we see a repeat of December 2010 at the end of the year.