I posted earlier about a big spike in the Moyhu NCEP/NCAR index in early October. That index is one that I derive by integrating NCEP/NCAR reanalysis data, as explained here. The index came back from the peak, but only back to levels that would have been seen as very high in earlier months, and stayed high right to end month. So the average finished at 0.567°C, as compared to September 0.368°C. These numbers are relative to base years 1994-2013.
That makes October by far the highest monthly anomaly in the record; in fact, it beats the previous record (Jan 2007) by 0.15°C. That can be seen in the following graph of all monthly anomalies since 1994:
Relative to the 1951-80 base of GISS, October would be 1.18°C, and on the NOAA 20th Cen base, it would be 1.14°C. I wouldn't expect to see those indices rise so high, because they have been somewhat lagging the NCEP/NCAR index recently. In September, GISS was only 0.81°C. Still, there is clearly a possibility of GISS reaching 1°C, and a very strong probability of being the highest anomaly ever, in all indices.
In a related news item, Australia's October was the hottest month ever. Also very dry, where I am. We had a very unusual heat wave at the start of the month, and it continued mostly warm and sunny. It looks like a dangerous fire season coming.