NASA released some data a few days ago confirming what many objective observers were saying about 2009: it would be one of the hottest years for planet Earth in modern recorded history. The NASA data mesh well with what NOAA and UKMet had already announced. Importantly, the NASA data include temperatures over very northern latitudes, while UKMet chooses instead to interpolate surface station temperatures on coastlines over the Arctic Ocean, where direct measurements are scarce. Unsurprisingly, the NASA data have been shown to be more representative of conditions where observations are made away from land. As a result of slightly different methodologies of constructing the temperature data, the three datasets have, at times, slightly different messages to deliver. 2009 was such a case in which all three largely agree with one another: global temperatures continue to increase in the long-term (day-to-day weather conditions aren’t representative of climate).
According to NASA, 2009′s globally average surface temperatures ranked 2nd behind 2005′s (and tied with 2007′s): 0.57°C above average, compared to 0.63°C above average: