Every February, global warming comes to Wenatchee, Washington. It gets 2 degrees warmer than the nearest town Waterville, WA. The picture below is of the average of the daily temperature differences for each day in the year, averaged from 1931 to 2008. You can see that there is a rise of about 2 degrees F each February/March, meaning that something is making Wenatchee warmer during that season. What it is, I don't know but it is a real problem because global warming is only supposed to have warmed the world by 1.1 degree, but Wenatchee warms that much each February.
Clearly this is a problem for claims that we can know what the climate is doing.
Note that the red bar represents 100 years of purported global warming. The world is said to have warmed by 1.1 deg in 100 years. But Wenatchee warms by 2 degrees F every February. It experiences 100 years of global warming each year.
In reality the noise in the data is so great that there is absolutely no way to determine what the temperature of the earth is doing. Only true believers believe that the temperature data shows that the earth is warming. Realists look at the data that I have shown and know that this data is utter crap.
A technical note. Elevational differences cause temperature differences. This can be corrected by what is called the adiabatic correction, 3.56 deg F/1000 feet. These data have been corrected to the lower elevation.