How Evenly Distributed Is Global Warming?

I tried to come up with a way to visualize how evenly distributed the warming we've seen is, and I settled on the following plot:

To generate this, I used a simple algorithm:

• take the 1 degree gridded, monthly average temperature data for land from Berkeley Earth
• starting at 1840, group it into decades for each latitude and longitude in Europe and most of North America
• plot each set of data from the 1840's to the 2000's for each latitude and longitude

The code is provided here.

In all, there were 1863 locations with a complete data set available for this. Overall, you see that pretty much every location warmed by roughly the same amount. Cheesy enough that I have to say it...global warming is apparently global. This is a slightly different way to view the same data that I have in a previous post.

I did the same thing for the entire globe also and the results are here:

Note that this plot's y-axis covers 6 degrees (C) instead of 4 degrees like the previous one because the spread is a bit larger. In general though, I really like this type of plot. Instead of having to create trendlines, I'm simply setting the opacity of each plot so only ones with a lot of overlap show up as bright white here which functions similarly to a trendline but looks a bit nicer to me.

Finally...an immediate question that you might have is 'where are those ~9000 global points', and the answer is:

It's weighted heavily for the northern hemisphere since there just wasn't great temperature coverage in 1840. If we start at a later date, we get better coverage: