That red thing with the hose and the exhaust stack is a space heater for the tent. Note the Stevenson Screen to the right and the automated weather station to the left. Note also that the station is boxed in pretty well with trees and infrastructure, and now we have this heated tent.
How do you suppose this affects the temperature readings? The warm exhaust air from the heater is located about 20 feet from the temperature sensor. The porter said it was a temporary structure that was set up every so often. I was unable to consult with the weather observer about how this situation came about or whether any corrections are being made to the data.
This isn’t the first time I’ve seen this sort of thing. If you’re going to try to compare temperature readings over a hundred years ago, wouldn’t you have to have very reliable data from say, 1915 and excellent reliable data from now? It looks like we can’t even count on the new data.