The Met Office released historical data from their weather stations some time ago now but I've only just got around to looking at them. So far I've looked at the mean daily maximum temperatures for Oxford and Armagh in June and December. Oxford and Armagh are the two oldest stations in the set.
The results show no trend change over time. In other words, since the mid-1800s the mean daily maximum temperatures have fluctuated within the same bounds. There does not appear to be any gradual increase in the temperatures at all.
Does anyone know if this data set has been studied in the context of climate change? And if so, what are the conclusions that one can draw from the set?