Digital Diatribes

A presentation of data on climate and other stuff

Temperature Trends for the last 300 months – HadCrut

Posted by The Diatribe Guy on May 22, 2012

Here are the latest charts for the HadCrut Global Temperature Anomalies, for the 25 year period ending March 2012.

The Data

What is presented here is the trend over the last 300 months, the slope of which has been in very consistent decline over the last five years. The current slope itself is +.113 (actually a bit less than the 20 year slope). So, at this point, the 25-year trend is still positive

Chart below:

25 year Trend - HadCrut

Trend Line over Last 300 months – HadCrut

The next chart is simply a point of comparison. The highest slope value in recent years occurred with the 25-year period ending February 2007.

Recent Peak trend line

Peak 300 Month Trend Line

Finally, I show what has transpired with the slopes in recent years with the 25 year trend line. There has been a consistent decline in the slopes of the best-fitted lines. The decline itself is a very close linear fit, though in the most recent periods you can see it accelerate in its declining value. There is little indication that this decline will halt in the near term. If I plug the latest 12-month average anomalies the values continue to decline.

Trend in recent 300-month slopes

Trend in recent 300-month slopes

About these ads

2 Responses to “Temperature Trends for the last 300 months – HadCrut”

  1. Luke said

    “There is little indication that this decline will halt in the near term.” What are the “indications” that you would look at?

    • I have my spreadsheet set up to test go-forward slope values using inputted anomaly values. The anomalies that would be required to halt the downward trend are well above any recent anomaly values. As a point of interest, I could provide those numbers to illustrate. Maybe I’ll do that next post.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

 
Follow

Get every new post delivered to your Inbox.

%d bloggers like this: