So, looks to have been an exceptionally mild month, but not record-breaking.
Locally, I'm odds-on for the mildest Jan of the 21st Century so far, just about edging out 2007 (6.97*C). Probably falling short of 1990's record-holding 7.2*C.
Looking ahead to Feb, a lot of +NAO regimes featuring in the modelling, but some uncertainty regarding how much of a Euro High there is alongside that.
GFS 00z didn't have much, resulting in plenty of polar maritime air incursions to keep the CET in the 'fairly mild' territory; less than a degree above the LTA as of mid-month.
The GFS 06z, on the other hand, has much more of a Euro High from 9th Feb, with some seriously balmy conditions at times and little in the way of PM air crossing England. A rough CET estimate for that one is over 2.5*C above the LTA as of 14th!
The ECM 00z looks markedly milder than both those runs for 6th-7th, as it drives in a westerly flow much quicker than GFS, preventing the 2-3 frosty nights and chilly days offered by that model.
Starting to contemplate whether 2019-20 will challenge the mildest winters on record .