Digital Diatribes

A presentation of data on climate and other stuff

December 2008 Update on Global Temperature – RSS

Posted by The Diatribe Guy on December 8, 2008

RSS Anomaly released for the month of November has been released. This allows me to once again engage in my graphoholic tendencies…

The RSS data can be located here.

November’s Data Point in context:

  • The anomaly for November was 0.216 (in terms of degrees Celsius).
  • This reading was 0.085 degrees warmer than November 2007
  • It was 0.035 degrees warmer than Octber 2008
  • The anomaly ranks as the 94th warmest anomaly of the 359 data points
  • It ranks as the 8th warmest November of the 30 Novembers on record


  • The anomaly reading broke a streak of 14 consecutive year-over-year cooler anomaly readings, which is tied for the second-longest such streak in the data set.


  • The 12-month average anomaly is 0.086, which is up a bit from last month’s recent low point of 0.079.

Slopes and Charts

The overall RSS trend is 0.13109, which is the equivalent of 1.57 degrees warming per Century. We're one month short of a full 30 years, so starting next month we can start to evaluate the 30-year slope values.

The furthest back we can extend a non-warming line is to April 1997 (11 years, 8 months.) While the front end has not extended back since last month, it stayed the same while we added one month to the end.

The current 60-month trend is quite negative (-0.3530), though it has actually increased over the last three months.

The 60-month slope values have declined since 2004 as shown in this chart. The current blip up has happened before, and subsequently reversed back, so we'll have to wait and see on whether or not the trend continues downward from here on out.

The 60-month slope values have cycled over the course of the last 30 years in the RSS data set as shown above. There isn't as much history as the SST measures, but it's interesting, nonetheless. We're currently at the most negative slopes in the data set with the exception of a period in the mid-80s.

The current 120-month trend is 0.0873. This is lower than last month, which reverses a 9-consecutive month run of slope value increases in the 120-month measure. As of now, I'll keep viewing this as a downward trend due to the magnitude of the overall fall from the peak trend shown above, for the period ending March 2002. The last year notwithstanding, we've still seen quite a decline. However, I'll keep my eye on it to see if there are further increases, in which case the chart would switch to a trough.

The cycle of slopes for the 120-month trend lines is shown here. It is a bit clearer here that there has been a longer-term trend down in slopes, despite the last year's uptick.

The current 180-month trend is 0.1053, which continues a fairly long-term decline in the 180-month slope values. The current value is the lowest calculated since the period ending September 1997.

The trend down in slopes since the last peak value for the 180-month calculations is shown here.

The current slope of the 240-month trend line, 0.1707, is also on a downward trend, and is the lowest value since the period ending March 2002. Shown here is the peak value from which it is trending down (0.2156).

The current 300-month trend is 0.1714, and has just kind of been bouncing around in the range between 0.1700 and 0.1716 for the last seven months. However, since early 2007, it has also declined slightly, and the chart of slopes for the 300-month trend lines is shown here.

I have to admit I was a bit surprised at the higher readings for November. I tend to keep an eye on these regional climate maps as the month goes on, and most of what I saw last month was either blue or neutral. The exception was Russia, which was bright red. Apparently, Russia’s huge land mass was enough to offset cool weather that appeared to be hovering around otehr spots on the globe.

Unfortunately for people like me in the Midwestern U.S., the most consistent deep blue and purple readings I see are in the central to eastern U.S. The measurement in Fahrenheit aside, it makes a guy kind of ticked off. As I type this, the temps here have been crazy low over the last week (kickoff temperature at Lambeau this week was 6 degrees) and the snow has just started flying, and we’re expecting up to 12 inches. Last winter was horribly cold with a lot of snow, and this one is shaping up exactly like last year. We already have about a foot of snow before this storm hit us.

Anecdotal, I know. But when you live through it, you want to punch people who are wringing their hands about how horrible “global warming” is. Whether it’s true or false, or whether we cause it or not, right now I’m wishing we had a good dose of it.


One Response to “December 2008 Update on Global Temperature – RSS”

  1. […] Update on Global Temperature – UAHNovember 2008 Update on Global Temperature – RSSLearn About JoeDecember 2008 Update on Global Temperature – RSSSome fun stats with Sunspots and how the current activity stacks up against recent historyAugust […]

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