As usual in cold weather the provisional CET is way way too high. So expect a large downward adjustment at the end of the month.
Up to and including today I calculate the CET to be at 4.5C.
It is very true that the coldest CET station is in the south east and the warmest in the north west this month.
Stonyhurst has a mean of 5.1C including a minimum of 3.2C which is way above the other two stations.
Pershore has a mean of 4.5C and Rothamsted has a mean of 4.0C. This is still quite a bit above what we have seen further south-east.
As to where we finish up this month well I currently estimate a final figure for the CET of 4.98C. This assumes a significant warm up in the final 5 days of the month which is by no means certain at this point. As at the 26th I currently estimate the CET will be back at the 4.5C it is currently at. So somewhere between 4.5C and 5C is likely to be where we finish.