It's something that we wanted to show too. Apart from the technical complexity involved it would be hard to show warming. In the last century overall warming wa

It's something that we wanted to show too. Apart from the technical complexity involved it would be hard to show warming. In the last century overall warming was maybe 1 deg C, but temperatures fluctuate from year to year by up to 15 degrees. Here is a delta graph for 1900 - 2012, for example: https://www.evernote.com/shard/s5/sh/6d1d932a-c1ed-411d-9b74-867c929b4c49/58f12d843c59aab005bdd6ebd7d5794b/res/a7dbb16d-867f-4885-b34f-8f8d58b1a43e/skitch.png https://www.evernote.com/shard/s5/sh/6d1d932a-c1ed-411d-9b74... One way of doing it though would be to use a rolling average of, say, 5 years.