The University of Alabama-Huntsville (UAH) global average lower tropospheric temperature anomaly for January 2013 has been released via the web site of Dr Roy Spencer.
January 2013: Anomaly +0.51 degrees Celsius
This is the second warmest January temperature recorded since the satellite record was started in December 1978. The warmest January to date over this period was January 2010, with an anomaly of +0.59 degrees Celsius.
As background, five major global temperature time series are collated: three land-based and two satellite-based. The most high profile satellite-based series is put together by UAH and covers the period from December 1978 to the present. Like all these time series, the data is presented as an anomaly (difference) from the average, with the average in this case being the 30-year period from 1981 to 2010.
The official link to the data at UAH can be found here, but most months we get a sneak preview of the release via the climatologist Dr Roy Spencer at his blog.Spencer, and his colleague John Christy at UAH, are noted climate skeptics. They are also highly qualified climate scientists, who believe that natural climate variability accounts for most of recent warming. If they are correct, then we should see some flattening or even reversal of the upward trend within the UAH temperature time series. To date, we haven’t (click for larger image):