I haven’t covered the Remote Sensing Systems (RSS) dataset much lately, since not a lot of interesting things have been happening with it. October 2010 though is a different story. There’s been quite a significant drop in the RSS global surface temperature. Here’s the data plot:
More info on Remote Sensing Systems here
The drop from July is significant, and very steep, losing more than half of the temperature anomaly since then. The last time we were near this temperature was one year ago, in October 2009, when RSS reported 0.282°C The rise and the fall of global temperature this past year approximates a square wave. A moderate to strong El Niño followed by a strong La Niña is the cause.
The southern hemisphere has dropped the most. Here’s a much larger comparison plot between the Global Anomaly. the Northern Hemisphere and the Southern Hemisphere:
The UAH Global Temperature anomaly data also reported a drop in October, through not as steep, and remains higher.