Breaking the trend of the last few months, NASA GISS record that June 2010 was not the hottest June on record since records began (see the “Ts [Surface Temperature] Anomaly” in the bottom right hand quarter of the chart/graph above), even though they admit that the period January 2010 to June 2010 has definitely been the warmest January to June ever, out of 131 years (see the top left hand quarter of the chart/graph above).
Meanwhile, at NOAA, there is some disagreement :-
“Global Highlights : The combined global land and ocean average surface temperature for June 2010 was the warmest on record at 16.2 degrees Celsius, which is 0.68 degrees Celsius above the 20th century average of 15.5 degrees Celsius. The previous record for June was set in 2005. June 2010 was the fourth consecutive warmest month on record (March, April, and May 2010 were also the warmest on record). This was the 304th consecutive month with a global temperature above the 20th century average. The last month with below-average temperature was February 1985. The June worldwide averaged land surface temperature was 1.07 degrees Celsius above the 20th century average of 13.3 degrees Celsius – the warmest on record.”
Not all the satellite data agree about whether the period January to June 2010 beats any previous records. Here’s RATPAC :-
And here’s Adjusted UAH mid-troposphere :-