The TempLS mesh global anomaly (1961-90) rose by 0.07°C in December (from 0.894 to 0.964). That makes it the hottest month in the record, beating October by 0.04°C. And it makes 2015 by far the hottest year. The annual average was 0.727°C, exceeding that of 2014 (the previous max) by 0.129. This is based on 4200 stations reporting in December; Greenland and Mexico have not yet reported.
The rise was a little less than that for the Moyhu NCEP/NCAR index, which rose by 0.108°C from Nov to Dec. However, TempLS grid rose even more, by 0.164°C (from .832 to .996). And the annual mean, at 0.744°C) exceeded the previous record by 0.163°C.
In terms of implication for the major indices, as usual LS mesh links with GISS and grid with NOAA and HADCRUT. That would make a figure of at least 1.1°C for GISS - my guess would be about 1.15, and bigger rises in NOAA and HADCRUT. Of course all will have 2015 as a record year. GISS at 1.15 for December would put the annual average at 0.870°C, 0.127°C higher than 2014 (the previous record).
The breakdown for December showed a small drop in SST contribution, outweighed by rises in Asia, Siberia, and N America. The map shows a huge band of warmth around the 50°N parallel, through Eastern N America, Eurppe and Russia. Then also the El Nino region. Antarctica and Arctic were more normal, which is cooler than recent months. Changes in these regions are more strongly reflected in TempLS mesh than grid, which probably explains the greater rise in LS grid.
The satellite measures also showed strong rises - RSS from 0.428°C to 0.543°C in Dec. As Sou noted, that means that each of the last three months was the hottest ever (of that month) in the troposphere record.
I'll put the full report below the fold.