It's possible it got past us, but with the extensive coverage by ARGO and other ocean
temp measuring devices, it does seem to be a stretch.
If in fact, our understanding of the fate of the world as some would like everyone to believe rests to a large degree in the data gathered from
these temp measuring devices, would it not be plausible to have land measurements capable of the same degree of precision as those denizens of the deep are purportedly capable of giving.