I think you're mis-characterising both the graphs I linked.

I did not present the raw and adjusted data to show "there is no climate effect". They were presented to show that the observed climate effect in the 20th century is the result of adjustments to the raw data. This isn't the same argument at all: it merely sets up the next questions of what are these adjustments, why do they have such big effect and are we really sure they're correct, and why does NOAA report simulations as if they were actual measurements? Questions which are then investigated in turn. The answer may turn out to be "the code is correct, the algorithms are justified, the adjusted/synthetic data is more reliable", in which case, no problem. But given the low quality of the process these are questions absolutely worth asking.

Also these analyses aren't the old ones you're referring to from the 90s about medieval times, or even "Climategate" (which wasn't about any specific scientific claims anyway, but the process by which they were being made). This particular strand only focuses on the 20th century, and are recent analyses triggered by the rapid jump in synthetic data points being reported as temperature readings.

So reading from your start point: There looks like reason for suspicion of one localised set of results. Except immediately after he's talking of disproving the hockey stick. Time to stop reading. No point digging for context, or looking to original source.

Again I think you subtly misunderstood the argument.

The argument made wasn't "maybe there's something wrong with the data in Minnesota". That state was just used as an example because it has a good balance of AM/PM stations in the years when the adjustment is the biggest. The argument was that a key adjustment made to the data doesn't appear to be justified in for that state because the difference has an alternative explanation, yet despite decades of adjustments this was never detected? And by extension, maybe all cases where TOB adjustment is applied have these sorts of problems. To know whether TOB adjustment is fundamentally flawed would require more research, and the other adjustments even more, but there is smoke.

Your comparison to liquid pressure sensors doesn't help because in those cases you could measure the ground truth and adjust the sensor to match a pre-calibrated sensor. There's no way to know the ground truth for what temperature really was in Minnesota in the 1930s - all we have are the recorded measurements from those days, by people who thought they already had calibrated sensors. That's why we have to be very careful when playing with the data: we have nothing to calibrate against. The results of any adjustment are uncheckable except via reference to internal consistency and other explanations.

Now your position seems to be that there's really no way to investigate these models climatologists use that you will ever accept, because if the outcome is anything other than "yep, everything is basically correct +- minor changes" then you'd write it off automatically.

I understand that position: life is short, after all. But you shouldn't trash or write off people who are still investigating. As makomk points out elsewhere in this thread, a peer reviewer paper got published in Nature that promoted the current consensus view, but it turned out to be misusing data
and maths to make the conclusions sound way more certain than they were. Found by a blogger who has been critical of climate science for a long time. The system doesn't always self correct and outsiders have different incentives to government-funded scientists.

As for the Met Office, of course they aren't directly incentivised to give wrong results. But we know they did before because for years temperature datasets showed a "pause" in warming nobody could explain. That data has now been erased and the latest temperature datasets show no pause ever happened. Where were the mass investigations into that? Look, if the Met Offfice reported wildly different results to the "consensus" then they'd be picking a fight with the rest of the climate establishment, which would be a huge deal for them and put their entire reputation at risk, which is very important to them. In the past I've witnessed the effects of someone claiming there's a consensus of experts supporting their view, in a case when I was deeply involved and knew flat out there wasn't. The effects were terrifying; hundreds of people slowly lost their minds and came to believe things that were clearly nonsense. There actually was no consensus about such ridiculous ideas, just a few people claiming repeatedly there was and a whole lot of social pressure / selective editing on community news channels to make it look like more people agreed with them than really did. It's very easy to see signs of the same things happening here. That's why I want more outsiders and outside scrutiny.