Thursday, July 01, 2010

UAH: warmest June on the satellite record

According to UAH AMSU daily temperatures, the average June 2010 day was 0.55 °C warmer than the average June 2009 day (near the surface). The implied warming rate is 55 °C per century. ;-)

Because June 2009 was relatively cool - with the anomaly of 0.05 °C - it means that the UAH anomaly for June 2010 will be around 0.60 °C which should still be enough to edge past 0.57 °C, the figure from the so-far warmest June, namely June 1998.

However, the final UAH database is using different satellites than the daily data - with smaller diurnal errors - so the final reading may change by as much as 0.05 °C which would also invalidate the claim about the "new record".

In 2009, the July anomaly was 0.39 °C higher than the June anomaly.


Roy Spencer says that the final reading will probably be 0.44 °C, which is 0.16 °C lower than one calculated above. It's a huge change caused by the new satellite. The daily data are therefore unusable and my confidence in the satellite record has dropped markedly.


  1. Roy Spencer says it's .44 C

  2. Wow, the error - the difference between the two satellites - is 0.16 °C. It's huge.

    In that case, my confidence in the reliability of the satellite records diminishes substantially. It's a kind of coincidence that they switched to a different one, and it has modified the temperature jumps in a year by 0.16 °C.