Did you just read the 6 sentence summary without clicking through and looking for the data? Here's a paper used in the analysis which you just read that talks about the uncertainty and standard deviations: ftp://ftp.ncdc.noaa.gov/pub/data/ushcn/v2/monthly/algorithm-uncertainty/

> Edit: Now that I think about it, the lack of basic statistical disclosures is pretty damning evidence that nothing significant has happened.

No.