Watts Up With That?

UAH Global Temperature Update for February, 2013: +0.18 deg. C

By Dr. Roy Spencer

Our Version 5.5 global average lower tropospheric temperature (LT) anomaly for February, 2013 is +0.18 deg. C, a large decrease from January’s +0.50 deg. C. (click for large version):
UAH_LT_1979_thru_Feb_2013_v5.5

These large month-to-month changes are not that uncommon, especially during Southern Hemisphere summer, and are due to small variations (several percent) in the convective heat flux from the ocean surface to the atmosphere.

The global, hemispheric, and tropical LT anomalies from the 30-year (1981-2010) average for the last 14 months are: 

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