[Updated] UAH, straight from the source, Dr. Roy Spencer who announced it on his blog today.
The was a lot of speculation last year that our global temperature would recover from the huge drops last spring. While there has been some recovery, the overall global temperature trend since 1999 has been the subject of much debate. What is not debatable is that the current global temperature anomaly, as determined by a leading authority on global satellite temperature measurements, says we have no departure from “normal” this month. Given the U.S. Senate is about to vote upon the most complex and costly plan to regulate greenhouse gases, while the EPA suppresses earlier versions of the chart shown below from a senior analyst, this should give some pause to those who are rational thinkers. For those that see only dogma, I expect this will be greeted with jeers. – Anthony
Dr. Roy Spencer
July 3rd, 2009
YR MON GLOBE NH SH TROPICS
2009 1 0.304 0.443 0.165 -0.036
2009 2 0.347 0.678 0.016 0.051
2009 3 0.206 0.310 0.103 -0.149
2009 4 0.090 0.124 0.056 -0.014
2009 5 0.045 0.046 0.044 -0.166
2009 6 0.001 0.032 -0.030 -0.003
June 2009 saw another — albeit small — drop in the global average temperature anomaly, from +0.04 deg. C in May to 0.00 deg. C in June, with the coolest anomaly (-0.03 deg. C) in the Tropics. The decadal temperature trend for the period December 1978 through June 2009 remains at +0.13 deg. C per decade.
NOTE: A reminder for those who are monitoring the daily progress of global-average temperatures here:
(1) Only use channel 5 (”ch05″), which is what we use for the lower troposphere and middle troposphere temperature products.
(2) Compare the current month to the same calendar month from the previous year (which is already plotted for you).
(3) The progress of daily temperatures (the current month versus the same calendar month from one year ago) should only be used as a rough guide for how the current month is shaping up because they come from the AMSU instrument on the NOAA-15 satellite, which has a substantial diurnal drift in the local time of the orbit. Our ‘official’ results presented above, in contrast, are from AMSU on NASA’s Aqua satellite, which carries extra fuel to keep it in a stable orbit. Therefore, there is no diurnal drift adjustment needed in our official product.