I’ve been discussing the Berkeley Earth temperature record (BEST) for the last few days. My comments have been quite critical with me going so far as to say the BEST data has no accuracy at regional scales. I’ve now set up an easy way to test this view. All you have to do is pick a spot:
Pick any spot on that map that isn’t blue, and I will show you how BEST’s temperature estimates for that area compare to NASA GISS’s. As an example, here’s what you’d get if you picked my house (a five year smooth is applied to each graph):
There are four BEST graphs to one GISS graph because GISS uses a 2º x 2º grid while BEST uses a 1º x 1º grid. As you can see, there’s little point in BEST using that 1º x 1º grid as all four of its grids are nearly identical. As you can also see, all four of those graphs are dramatically different than GISS’s. They all have a strong warming trend not present in the GISS data.
The same is true for many other areas. A particularly troubling one is in Atlanta, Georgia:
GISS shows that area has cooled slightly. BEST says that area has warmed noticeably. There is no legitimate reason for that. One of these data sets must be wrong.
So pick a spot. I’ll post the temperature for it, and you can decide for yourself which results you think are more believable. Bonus points to anyone who can pick a spot BEST says is cooling.