Its data sources are unclear

The site claims to use unadjusted surface temperatures from these sources:

• NOAA Global METARs;
• NOAA One-Minute Observations (OMOs);
• NDBC Global Buoy Reports;
• MADIS Mesonet Data.

 

It claims that "the current temperature is the 12M average mean surface temperature over the last 12 months compared against the 30 year mean".

However, it is not explained which stations are used, and how the measured temperatures are combined to provide a balanced value for the global average. It also does not explain how inconsistencies like these are dealt with:

• NOAA Global METARs were only collected from the US from July 2001, and globally from March 2006. It is not therefore clear how the 30 year mean takes this into account;
• NOAA One-Minute Observations (OMOs) have only been collected since 2009 (30 year mean?) and follow a different standard to the METAR data and cover the Continental US (CONUS) only;
• NDBC Global Buoy Reports are only collected from stations in the marine environment;
• MADIS Mesonet Data has only been available since July 2001, so once again there can be no 30 year mean. A very wide range of data is available via MADIS, and it is not specified which data are used and why.

 

So, sources are listed - few if any of which have been available for 30 years - but which sources/stations are used is not specified.

There also seems to be no way of identifying or accessing the historical data used in the subsequent analysis, only a "live feed". Most other providers of such analyses make the data they have used available. After all, it will all have started out in the public domain.

Its analysis is flawed and inconsistent

Key aspects of the analysis are unexplained.

One aspect is a mysterious temperature that is referred to as "Normal".

What is "Normal" and how is it calculated?

How do the data in the table relate to the data in the chart, which covers the same period?

How do the data in the chart relate to "Normal"?

Its attempts to obfuscate mainly confuse deniers

Deniers who refer to the website seem to believe that it shows that temperatures are decreasing.

All one has to do is fit a least squares trend line to the data in the chart and it is clear that it shows temperatures increasing, and at a rate higher then the one currently estimated by NASA.