We started 2016 with some good news from classic oldWeather – the 3-millionth transcribed weather observation from the US Government Arctic logbooks. It’s great to finish it with some more – we have just rescued our 4-millionth.

Those 4-million observations come from more than 480,000 transcribed pages, and are the work of 4,730 different people. We’ve looked before at how the work has been divided up between the participants, but to celebrate 4 million I wanted to go beyond that, and show not only what had been done, but also when.

This is oldWeather meets abstract expressionism, but the descending stripes are not abstract – each one represents one contributor: If you’ve transcribed a page for oldWeather-classic, one of them is you. Time runs down, from the project launch at the top, to the present at the bottom, and the colours distinguish work done on the different ships.

We can see most clearly the large and consistent contributions of our most committed and expert participants – truly the backbone of the project. But also the brief bursts of interest produced by newsletters and media mentions, and everything in between. Again I hope everyone is proud of their contribution – it’s taken us all to do it; and in spite of the awesome size of our achievement (4 million new observations) we are, just about, still all on the same page.