Here is a lovely example of exactly what the scientists can do with the data our volunteers provide. In the year 1919 the HMS New Zealand sailed from the UK, through the Suez Canal, on to India, then Australia and New Zealand before ending up in North America. The graph shows the atmospheric pressure data for the places along the voyage. The blue band shows the range of our estimates before oldWeather, the black points the new observations we provided, and the red band the revised analysis range incorporating our observations. So we can see that the data provided from oldWeather has lead to a significant increase in the precision of the measurements, especially around New Zealand who’s isolation means that its historical data is poorly documented.

Read more about this on the oldWeather blog and help us pin down more historical climate data like this at