And there are several climate cycles that are normally associated with colder temperatures.http://www.nbcnews.com/science/how-hot-was-it-2013-joins-top-10-temperatures-experts-2D11967298
John Roach NBC News
Jan. 21, 2013
Globally, 2013 failed to shatter temperature records, but it ranks among the top 10 warmest years since recordkeeping began, according to new figures released Tuesday by government scientists. The readings, they said, are consistent with a long-term global warming trend.
According to the National Oceanic and Atmospheric Administration, the global average temperature for 2013 was 58.12 degrees Fahrenheit, which ties with 2003 as the fourth-warmest since 1880. NASA said 2013's global average was 58.3 degrees F and put the year in a tie for No. 7.
The two agencies use different methods to collect and interpret global temperature data. One big difference is that NASA extrapolates observational data into regions without meteorological stations, including the polar regions, whereas NOAA does not.
"That means when you are looking at the global means, the numbers are slightly different," Gavin Schmidt, deputy director of the NASA Goddard Institute for Space Studies, explained on a call with reporters Tuesday. He added that the differences between them are "within the uncertainty level of what we can estimate."
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