Recently, while discussing the Berkeley Earth temperature record (BEST), I made the comment it seemed every station showed a similar warming trend in recent times. I decided to test that idea by looking at the last 50 years or so. To do so, I created a map of linear trends from for the 1960-2013 period:
You’ll note, the scale of the map begins at 0. That’s because there isn’t a single point on it below zero. According to BEST, not a single location on the planet has cooled since 1960.
We can confirm this by looking at a histogram of the trends:
Of course, this is just for one period. I tested to see if this pattern held for other periods. Try periods as far back to 1900, I found the same thing. The world simply didn’t cool. However, I did find cooling when I tried going forward in time. Here is a map of trends for 1980-2013:
The colors of the two maps don’t match up as I haven’t worked out the kinks of coloring the plots yet. Still, you can see the scale of this map begins below zero. That means some trends were negative. To see how much of the globe was cooling, we can look at a histogram of the data again:
There are 585 negative trends (out of 24,311 calculated trends), all of which are very small. That shows cooling isn’t impossible in the BEST record. It’s just very unlikely to happen in modern times, and it will only happen with relatively short segments.
Of course, there are always concerns that the periods chosen aren’t representative. To address this possibility, I’ll show the trends for any period people are interested in. Feel free to ask for any you’d like to see.