High low thermometers

P, being a bit strange and delighting in data and statistics, likes to view several of our local amateur weather station's recordings of the temps, rainfall and wind speed etc. We also have an airfield nearby which reports to the met office. In fairness they are never exactly the same as mine due to topography but offer a sanity check. I like my thermometers wouldn't be without them, but it's all a bit academic how low the temp has gone if everything's been clobbered.