The Blackboard

HadCRUT NH+SH posted their temperatures anomaly for February:

The anomaly was 0.460 C, down from 0.495 C in January. ( Note that the January temperature was revise from 0.470 to 0.495.)
According to my tally, this was the 7th warmest February 4 in the HadCRUT NH&SH record. February anomalies are circled in the graph above; [...]

WARNING: While adding GISS, I noticed I am not replicating my GISS results from the other computations precisely. That means there is at least 1 bug in my spreadsheet. I’m looking for the bug. In the meantime, I’m blanking out while I find the error. (It’s dinner time, and I may not find [...]

In comments yesterday, Nathan seemed to indicate he wanted to see the result of some sort of test with data beginning in January 2001. Here’s a graph just for Nathan:

Above is a graph showing how the trend of 0.2 C/decade fits into ±95% uncertainty intervals computed for NOAA observation. The uncertainty intervals are estimated assuming [...]

GISSTemp released their land/ocean anomalies for February. It’s 0.71C, just edging out January. Rebaselined anomalies and trends since 1980 are shown below, along with with a trend of 0.2C/decade shown for reference:
This is a hot start for the year. Factoids about the GISSTemp data:

This is the second highest Feb. anomaly in the record; [...]

RSS, UAH (v5.2) and the new revised UAH (v5.3) February temperature anomalies for the lower troposphere have been posted; anomalies during the observational record are shown below along with the multi-model mean for the surface temperature based on 20th century simulations extended into the 21st century using A1B :
Comparison of the RSS and [...]

In discussions of the application of the Hansen/Lebedeff gridding method to “toy planet” data, a few people noted that the “toy” data used did not hightlight a known way bias can be introduced into a computed temperature trend as a result of dropping out a whole bunch of stations. This can give the false [...]

The “toy planet” discussion of the “basic” anomaly method in its most idealized form was such a hit, I’ve decided to discuss how the ‘bias’ method used in section (3) of Hansen and Lebedeff 1987 — the method actually used by GISTemp– might be affected by deal with “the march of the thermometers”. One [...]

Roy Spencer posted two versions of the UAH temperature of the lower troposphere! According to version 5.3, the temperature of the lower troposphere was 0.63C; according to version 5.2, it was 0.74C. Despite the fact that I my bet of 0.64 would have been closer to correct using the splendid new version 5.3, we [...]

As some of my readers know, when someone raises a criticism of a particular widely used result in climate science, I often like to try to understand the main issue and discuss it using a toy problem or “cartoon”. That is: I like to create an artificial problem that highlights the issue that someone claims [...]

Many in comments have suggested that some of the rebuttals to the claim that the march of the thermometers actually biases temperature anomalies reported by NOAA, GISSTemp and CRU may be unnecessary. How so, it’s possible no one has really made that claim. If so, the ‘rebuttals’ would be countering strawmen (i.e. arguments that [...]