By Luboš Motl, Pilsen, Czech Republic in The Reference Frame

According to the new RSS MSU satellite data, September 2007 was the 7th coldest month among 81 months since January 2001. It has made it to the 9% of the coolest months of the 21st century so far. Their gadgets measure temperature at latitudes between -70.0 (S) and +82.5 (N) - about 94.5% of the surface if I compute well.

In the last month, the global temperature was just 0.12 Celsius degrees above the long-term average which means that it was 0.78 Celsius degrees cooler than the temperature in April 1998 when the anomaly was +0.9 Celsius degrees. The main reason is La Nina that is getting stronger and might continue to do so for a few months.

The Southern hemisphere was 0.015 Celsius degrees cooler (!) than the long-term average, fifth coldest month since January 2001. Antarctica has cooled down by roughly 1 Fahrenheit degree in the last 50 years. See Lubos’s blog here.