cc344

I guess you missed the main point of lack of data in addition to possible quality issues. Certainly I would assume we collect many more air temperature readings now then we did in the 1800’s even into the 1900’s. I can’t imagine there are nearly as much temperature data from 100 years ago compared to how much data is being collected in the last 30. You didn’t answer the real question, of course a thermometer works the same, but does the collection methods work the same? Did we have satellite data 100 years ago? Obviously not. We are collecting a much wider variety of data from a variety of sensors and it has built up especially in the last 50 years. I haven’t seen the data I’m only asking the question. What does the data look like, I’d love to compare just a slice from one city. Someone post the data from that data set that compares 100 years ago reading to ones collected in 20 year intervals. My guess is that there is progressively more and more data as you move forward. If I’m wrong show me the data.

I think this is an interesting project, it does seem to present the information in a rather biased way. I’m not trying to dispute whether things are warmer, but I would like to better understand what the underlying data consists of. I know they have 148 years of data, so I’m curious how that data was collected even 50 to 70 years ago let alone 100 years ago. There has to be a change in the quality of the data collection over time. It would be challenging to fairly compare data from the last 10 or so years to a similar timeframe 100 years ago. I would imagine data doesn’t even exist in some of the cities.

Maybe people who have more expertise in the field or the data collection can chime in.