Conclusions
It is often argued that the number of record highs set recently far exceeds record lows. But this misses the point that the 1960’s and 70’s were a much colder interlude across the USA. We would not expect to see so many record lows at sites set up in the 1940’s and 50’s, when many were, due to the massive expansion of airport construction.
I have argued this before, and I will make the point again. For these daily records to be meaningful, they need to be based on:
1) Only USHCN sites.
2) Only sites with at least 100 years of record.
3) Non airport sites.
4) Non urban sites.
There are approximately 1200 USHCN stations, and their almost total absence from the above daily records for June/July is significant. If we really were seeing new daily record temperatures in these regions, the USHCN stations would reflect that fact.
The conclusion is clear – the records claimed are spurious.
